10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

_____________________________________________________

Form 10-Q

 _____________________________________________________

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2013

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 001-33462

_____________________________________________________

INSULET CORPORATION

(Exact name of Registrant as specified in its charter)

_____________________________________________________

Delaware	04-3523891
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)
9 Oak Park Drive Bedford, Massachusetts	01730
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, Including Area Code: (781) 457-5000

_____________________________________________________

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x		Accelerated filer	¨
Non-accelerated filer	¨	(Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

As of August 2, 2013, the registrant had 54,418,963 shares of common stock outstanding.

INSULET CORPORATION

TABLE OF CONTENTS

	Page
PART I. FINANCIAL INFORMATION
Item 1. Consolidated Financial Statements (unaudited)	3
Consolidated Balance Sheets as of June 30, 2013 and December 31, 2012	3
Consolidated Statements of Operations for the three and six months ended June 30, 2013 and 2012	4
Consolidated Statements of Cash Flows for the six months ended June 30, 2013 and 2012	5
Notes to Consolidated Financial Statements	6
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	20
Item 3. Quantitative and Qualitative Disclosures About Market Risk	30
Item 4. Controls and Procedures	31
PART II. OTHER INFORMATION
Item 1. Legal Proceedings	32
Item 1A. Risk Factors	32
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	32
Item 3. Defaults Upon Senior Securities	32
Item 4. Mine Safety Disclosures	32
Item 5. Other Information	33
Item 6. Exhibits	33
Signatures	34

PART I — FINANCIAL INFORMATION

Item 1. Consolidated Financial Statements

INSULET CORPORATION

CONSOLIDATED BALANCE SHEETS

	As of June 30, 2013			As of December 31, 2012
	(Unaudited) (In thousands, except share and per share data)
ASSETS
Current Assets
Cash and cash equivalents	$	150,944		$	57,293
Accounts receivable, net	33,650			33,294
Inventories	5,979			14,867
Prepaid expenses and other current assets	6,556			4,482
Total current assets	197,129			109,936
Property and equipment, net	29,334			25,422
Intangible assets, net	20,267			22,963
Goodwill	37,536			37,536
Other assets	1,886			2,202
Total assets	$	286,152		$	198,059
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current Liabilities
Accounts payable	$	11,441		$	9,361
Accrued expenses and other current liabilities	20,276			19,051
Deferred revenue	900			5,445
Current portion of capital lease obligation	1,236			—
Current portion of long-term debt	—			14,429
Total current liabilities	33,853			48,286
Capital lease obligation	3,048			—
Long-term debt	108,670			103,730
Other long-term liabilities	2,246			1,867
Total liabilities	147,817			153,883
Commitments and contingencies (Note 11)
Stockholders’ Equity
Preferred stock, $.001 par value:
Authorized: 5,000,000 shares at June 30, 2013 and December 31, 2012 Issued and outstanding: zero shares at June 30, 2013 and December 31, 2012	—			—
Common stock, $.001 par value:
Authorized: 100,000,000 shares at June 30, 2013 and December 31, 2012 Issued and outstanding: 54,329,612 and 48,359,063 shares at June 30, 2013 and December 31, 2012, respectively	54			48
Additional paid-in capital	641,016			525,679
Accumulated deficit	(502,735		)	(481,551		)
Total stockholders’ equity	138,335			44,176
Total liabilities and stockholders’ equity	$	286,152		$	198,059

The accompanying notes are an integral part of these consolidated financial statements.

3

INSULET CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

	Three Months Ended June 30,						Six Months Ended  June 30,
	2013			2012			2013			2012
	(Unaudited) (In thousands, except share and per share data)
Revenue	$	60,092		$	51,035		$	117,448		$	98,789
Cost of revenue	33,259			28,704			65,460			56,162
Gross profit	26,833			22,331			51,988			42,627
Operating expenses:
Research and development	5,174			6,521			9,570			11,953
General and administrative	13,901			12,665			26,995			25,685
Sales and marketing	13,580			13,664			27,451			26,403
Total operating expenses	32,655			32,850			64,016			64,041
Operating loss	(5,822		)	(10,519		)	(12,028		)	(21,414		)
Interest income	37			24			64			52
Interest and other expense	(4,616		)	(3,912		)	(8,971		)	(7,779		)
Other expense, net	(4,579		)	(3,888		)	(8,907		)	(7,727		)
Loss before income taxes	(10,401		)	(14,407		)	(20,935		)	(29,141		)
Income tax expense	(118		)	(69		)	(249		)	(115		)
Net loss	$	(10,519	)	$	(14,476	)	$	(21,184	)	$	(29,256	)
Net loss per share basic and diluted	$	(0.20	)	$	(0.30	)	$	(0.40	)	$	(0.61	)
Weighted-average number of shares used in calculating net loss per share	53,834,707			47,824,190			53,445,715			47,715,819

The accompanying notes are an integral part of these consolidated financial statements.

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INSULET CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Six Months Ended June 30,
	2013			2012
	(Unaudited) (In thousands)
Cash flows from operating activities
Net loss	$	(21,184	)	$	(29,256	)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	5,763			5,498
Non-cash interest and other expense	6,133			4,988
Stock-based compensation expense	6,844			5,155
Provision for bad debts	2,568			1,486
Changes in operating assets and liabilities:
Accounts receivable	(2,924		)	(3,887		)
Inventories	8,888			(4,588		)
Deferred revenue	(4,545		)	(1,434		)
Prepaid expenses and other assets	(2,055		)	(725		)
Accounts payable, accrued expenses and other current liabilities	3,305			2,730
Other long-term liabilities	379			16
Net cash provided by (used in) operating activities	3,172			(20,017		)
Cash flows from investing activities
Purchases of property and equipment	(2,695		)	(4,249		)
Net cash used in investing activities	(2,695		)	(4,249		)
Cash flows from financing activities
Repayment of debt	(2,000		)	—
Net proceeds from issuance of common stock	97,605			1,642
Payment of withholding taxes in connection with vesting of restricted stock units	(2,431		)	(1,187		)
Net cash provided by financing activities	93,174			455
Net increase (decrease) in cash and cash equivalents	93,651			(23,811		)
Cash and cash equivalents, beginning of period	57,293			93,955
Cash and cash equivalents, end of period	$	150,944		$	70,144
Non-cash investing and financing activities
Common stock issued in exchange for 5.375% Convertible Senior Notes	$	13,000		$	—
Purchases of property and equipment under capital lease	$	4,284		$	—

The accompanying notes are an integral part of these consolidated financial statements.

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INSULET CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Nature of the Business

The Company is primarily engaged in the development, manufacturing and sale of its proprietary OmniPod Insulin Management System (the “OmniPod System”), an innovative, discreet and easy-to-use insulin infusion system for people with insulin-dependent diabetes. The OmniPod System is the only commercially-available insulin infusion system of its kind. The OmniPod System features a unique disposable tubeless OmniPod which is worn on the body for approximately three days at a time and the handheld, wireless Personal Diabetes Manager (“PDM”). Conventional insulin pumps require people with insulin-dependent diabetes to learn to use, manage and wear a number of cumbersome components, including up to 42 inches of tubing. In contrast, the OmniPod System features two discreet, easy-to-use devices that eliminate the need for a bulky pump, tubing and separate blood glucose meter, provides for virtually pain-free automated cannula insertion, communicates wirelessly and integrates a blood glucose meter.

In June 2011, the Company acquired Neighborhood Holdings, Inc. and its wholly-owned subsidiaries (collectively, “Neighborhood Diabetes”) in order to support the sales of the OmniPod System, expand the Company’s full suite diabetes management product offerings and obtain access to a larger number of insulin dependent patients. Through Neighborhood Diabetes, the Company is able to provide customers with blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals and has the ability to process claims as either durable medical equipment or through pharmacy benefits.

The Company began commercial sale of the OmniPod System in the United States in October 2005. The Company has also expanded the availability of the OmniPod System internationally through its partnership with Ypsomed Distribution AG (“Ypsomed”) and GlaxoSmithKline (“GSK”). In January 2010, the Company entered into a distribution agreement with Ypsomed pursuant to which Ypsomed became the exclusive distributor of the OmniPod System in multiple countries. In February 2011, the Company entered into a distribution agreement with GSK pursuant to which GSK became the exclusive distributor of the OmniPod System in Canada.

In August 2011, the Company received CE Mark approval, and in December 2012 the Company received 510(k) clearance by the FDA for its new OmniPod System. The new OmniPod System is more than one-third smaller and one-quarter lighter than the original model, while maintaining the same features and operating capabilities. The Company began selling the new OmniPod System in certain countries in Europe through Ypsomed in 2012. The Company began selling the new OmniPod System to new customers in the U.S. during the first quarter of 2013 and began converting the existing customer base in the second quarter of 2013.

2. Summary of Significant Accounting Policies

Basis of Presentation

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q have been prepared in accordance with generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these unaudited consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring adjustments, considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2013, are not necessarily indicative of the results that may be expected for the full year ending December 31, 2013, or for any other subsequent interim period.

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.

Use of Estimates in Preparation of Financial Statements

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting periods. The most significant estimates used in these financial statements include the valuation of stock-based compensation expense, accounts receivable, inventories, goodwill, deferred revenue and equity instruments, the lives of property and equipment and intangible

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assets, as well as warranty and doubtful accounts allowance reserve calculations. Actual results may differ from those estimates.

Principles of Consolidation

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q include the accounts of the Company and its wholly-owned subsidiaries. All material intercompany balances and transactions have been eliminated in consolidation.

Fair Value Measurements

The Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 820, Fair Value Measurements and Disclosures (“ASC 820”) related to the fair value measurement of certain of its assets and liabilities. ASC 820 defines fair value as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. FASB ASC 820 also describes three levels of inputs that may be used to measure the fair value:

Level 1 — quoted prices in active markets for identical assets or liabilities

Level 2 — observable inputs other than quoted prices in active markets for identical assets or liabilities

Level 3 — unobservable inputs in which there is little or no market data available, which require the reporting entity to develop its own assumptions

The only assets and liabilities subject to fair value measurement standards at June 30, 2013 and December 31, 2012 are cash equivalents, including money market accounts, and long-term obligations which are based on Level 1 inputs.

Certain of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other liabilities are carried at cost, which approximates their fair value because of the short-term maturity of these financial instruments. Based on the borrowing rates currently available to the Company for loans with similar terms, the carrying value of the Company’s long-term debt and capital lease obligations approximates their fair values.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable consist of amounts due from third-party payors, patients, third-party distributors, and government agencies. The allowance for doubtful accounts is recorded at the time collection risk is identified. The Company estimates its allowance based on historical experience, assessment of specific risk, discussions with individual customers and various assumptions and estimates that are believed to be reasonable under the circumstances.

Inventories

Inventories are held at the lower of cost or market, determined under the first-in, first-out method. Inventory has been recorded at cost as of June 30, 2013 and December 31, 2012. Work in process is calculated based upon a build up in the stage of completion using estimated labor inputs for each stage in production. The Company periodically reviews inventories for potential impairment based on quantities on hand and expectations of future use.

Property and Equipment

Property and equipment is stated at cost and depreciated using the straight-line method over the estimated useful life of the respective assets. Leasehold improvements are amortized over their useful life or the life of the lease, whichever is shorter. Assets acquired under capital leases are amortized in accordance with the respective class of owned assets or life of the lease and the amortization is included with depreciation expense. Maintenance and repair costs are expensed as incurred.

Intangibles and Other Long-Lived Assets

The Company’s finite-lived intangible assets are stated at cost less accumulated amortization. The Company assesses its intangible and other long-lived assets for impairment whenever events or changes in circumstances suggest that the carrying value of an asset may not be recoverable. The Company recognizes an impairment loss for intangibles and other long-lived assets if the carrying amount of the asset is not recoverable based on its undiscounted future cash flows. Any such impairment loss is measured as the difference between the carrying amount and the fair value of the asset. The estimation of useful lives and expected cash flows requires the Company to make significant judgments regarding future periods that are subject to some factors outside its control. Changes in these estimates can result in significant revisions to the carrying value of these assets and may result in material charges to the results of operations. The estimated life of the acquired tradename asset is 15 years. The

7

estimated life of the acquired customer relationship asset is 10 years. Intangible assets with determinable estimated lives are amortized over these lives. At June 30, 2013, intangible assets consisted of $17.9 million of customer relationships and $2.4 million of tradenames.

Goodwill

Goodwill represents the excess of the cost of the acquired Neighborhood Diabetes businesses over the fair value of identifiable net assets acquired. The Company performs an assessment of its goodwill for impairment on at least an annual basis or whenever events or changes in circumstances indicate there might be impairment.

Goodwill is evaluated at the reporting unit level. To test for impairment, the Company compares the carrying value of the reporting unit to its fair value using a discounted cash flow analysis. If the reporting unit’s carrying value exceeds its fair value, the Company would record an impairment loss to the extent that the carrying value of goodwill exceeds its implied fair value.

Warranty

The Company provides a four-year warranty on its PDMs and may replace any OmniPods that do not function in accordance with product specifications. The Company estimates its warranty reserves at the time the product is shipped based on historical experience and the estimated cost to service the claims. Cost to service the claims reflects the current product cost, which has been decreasing over time. As these estimates are based on historical experience, and the Company continues to introduce new versions of existing products, the Company also considers the anticipated performance of the product over its warranty period in estimating warranty reserves.

Revenue Recognition

The Company generates nearly all of its revenue from sales of its OmniPod System and other diabetes related products including blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals to customers and third-party distributors who resell the products to patients with diabetes.

Revenue recognition requires that persuasive evidence of a sales arrangement exists, delivery of goods occurs through transfer of title and risk and rewards of ownership, the selling price is fixed or determinable and collectability is reasonably assured. With respect to these criteria:

• The evidence of an arrangement generally consists of a physician order form, a patient information form and, if applicable, third-party insurance approval for sales directly to patients or a purchase order for sales to a third-party distributor.

• Transfer of title and risk and rewards of ownership are passed to the patient or third-party distributor upon shipment of the products.

• The selling prices for all sales are fixed and agreed with the patient or third-party distributor and, if applicable, the patient’s third-party insurance provider(s), prior to shipment and are based on established list prices or, in the case of certain third-party insurers, contractually agreed upon prices. Provisions for discounts and rebates to customers are established as a reduction to revenue in the same period the related sales are recorded.

The Company offers a 45-day right of return for its OmniPod System sales to new patients, and defers revenue to reflect estimated sales returns in the same period that the related product sales are recorded. Returns are estimated through a comparison of the Company’s historical return data to their related sales. Historical rates of return are adjusted for known or expected changes in the marketplace when appropriate. When doubt exists about reasonable assuredness of collectability from specific customers, the Company defers revenue from sales of products to those customers until payment is received.

In June 2011, the Company entered into a development agreement with a U.S. based pharmaceutical company (the “Development Agreement”). Under the Development Agreement, the Company is required to perform design, development, regulatory and other services to support the pharmaceutical company as it works to obtain regulatory approval to use the Company’s drug delivery technology as a delivery method for its pharmaceutical. Over the term of the Development Agreement, the Company has and will continue to invoice amounts based upon meeting certain deliverable milestones. Revenue from the Development Agreement is recognized using a proportional performance methodology based on efforts incurred and total payments under the agreement. The impact of changes in the expected total effort or contract payments are recognized as a change in estimate using the cumulative catch-up method.

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The Company deferred revenue of $0.9 million and $5.4 million as of June 30, 2013 and December 31, 2012, respectively. The deferred revenue recorded was comprised of product-related revenue and unrecognized amounts related to the Development Agreement.

Concentration of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents. The Company maintains the majority of its cash with two accredited financial institutions.

The Company purchases complete OmniPods from Flextronics International Ltd., its single source supplier. As of June 30, 2013 and December 31, 2012, liabilities to one vendor represented approximately 29% and 19% of the combined balance of accounts payable and accrued expenses, and other current liabilities, respectively.

Segment Reporting

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated on a regular basis by the chief operating decision-maker, or decision-making group, in deciding how to allocate resources to an individual segment and in assessing performance of the segment. The Company’s current product offering consists of diabetes supplies, including the OmniPod System as well as other diabetes related products and supplies such as blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals. The Company’s current product offering is marketed to a single customer type, people with diabetes. As the Company sells a single product type, management operates the business as a single entity.

Income Taxes

Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates that will be in effect in the years in which the differences are expected to reverse. A valuation allowance is required to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company reviews its deferred tax assets for recoverability considering historical profitability, projected future taxable income, and the expected timing of the reversals of existing temporary differences and tax planning strategies.

The Company follows the provisions of FASB ASC 740-10, Income Taxes (“ASC 740-10”) on the accounting for uncertainty in income taxes recognized in its financial statements. ASC 740-10 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. In addition, ASC 740-10 provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, and disclosure and transition. The Company recognizes estimated interest and penalties for uncertain tax positions in income tax expense. As of June 30, 2013 interest and penalties were immaterial to the consolidated financial statements.

The Company files federal, state and foreign tax returns. These returns are generally open to examination by the relevant tax authorities from three to four years from the date they are filed. The tax filings relating to the Company's federal and state returns are currently open to examination for tax years 2009 through 2011 and 2008 through 2011, respectively. In addition, the Company has generated tax losses since its inception in 2000. These years may be subject to examination if the losses are carried forward and utilized in future years.

Stock-Based Compensation

The Company accounts for stock-based compensation under the provisions of FASB ASC 718-10, Compensation — Stock Compensation (“ASC 718-10”), which requires all share-based payments to employees, including grants of employee stock options, to be recognized in the income statement based on their fair values. Share-based payments that contain performance conditions are recognized when such conditions are probable of being achieved.

The Company uses the Black-Scholes option pricing model to determine the weighted average fair value of options granted. The Company determines the intrinsic value of restricted stock units based on the closing price of its common stock on the date of grant. The Company recognizes the compensation expense of share-based awards on a straight-line basis for awards with only service conditions and accelerated method for performance conditions over the respective vesting periods of the awards.

The determination of the fair value of share-based payment awards utilizing the Black-Scholes model is affected by the stock price and a number of assumptions, including expected volatility, expected life, risk-free interest rate and expected dividends. The expected life of the awards is estimated based on the midpoint between the vesting date and the end of the

9

contractual term. The risk-free interest rate assumption is based on observed interest rates appropriate for the terms of the awards. The dividend yield assumption is based on company history and expectation of paying no dividends. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Stock-based compensation expense recognized in the financial statements is based on awards that are ultimately expected to vest. The Company evaluates the assumptions used to value the awards on a quarterly basis and, if factors change and different assumptions are utilized, stock-based compensation expense may differ significantly from what has been recorded in the past. If there are any modifications or cancellations of the underlying unvested securities, the Company may be required to accelerate, increase or cancel any remaining unearned stock-based compensation expense.

See Footnote 12 for a summary of the stock activity under the Company’s stock-based employee compensation plan.

Recent Accounting Pronouncements

In July 2012, the FASB issued ASU No. 2012-2 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU No. 2012-2”). ASU No. 2012-2 gives a company the option to first assess qualitative factors to determine whether it is more-likely-than-not that the indefinite-lived intangible is impaired. Qualitative factors include related events and circumstances that could affect the significant inputs used in determining the fair value of the indefinite-lived intangible asset. The guidance is effective in fiscal years beginning after September 15, 2012. The Company adopted the guidance in the first quarter of 2013. The adoption of the guidance did not have a material impact on the Company's financial statements.

3. Debt

The Company had outstanding convertible debt and related deferred financing costs on its consolidated balance sheet as follows (in thousands):

	As of
	June 30, 2013			December 31, 2012
Principal amount of the 5.375% Convertible Senior Notes	$	—		$	15,000
Principal amount of the 3.75% Convertible Senior Notes	143,750			143,750
Unamortized discount	(35,080		)	(40,591		)
Total long-term debt	108,670			118,159
Current portion of debt	—			14,429
Long-term debt	$	108,670		$	103,730
Deferred financing costs	$	1,707		$	2,004

Interest and other expense related to the 5.375% Notes (as defined below) and the 3.75% Notes (as defined below) was included in interest and other expense on the consolidated statements of operations as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Contractual coupon interest	$	1,460	$	1,549	$	3,009	$	3,098
Accretion of debt discount	2,751		2,387		5,511		4,691
Loss on debt extinguishment	325		—		325		—
Amortization of debt issuance costs	149		149		297		297
Total interest and other expense	$	4,685	$	4,085	$	9,142	$	8,086

5.375% Convertible Senior Notes

In June 2008, the Company sold $85 million in principal amount of 5.375% Convertible Senior Notes due June 15, 2013 (the “5.375% Notes”) in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended. The interest rate on the notes was 5.375% per annum on the principal amount from June 16, 2008,

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payable semi-annually in arrears in cash on December 15 and June 15 of each year. The 5.375% Notes were convertible into the Company’s common stock at an initial conversion rate of 46.8467 shares of common stock per $1,000 principal amount of the 5.375% Notes, which is equivalent to a conversion price of approximately $21.35 per share, representing a conversion premium of 34% to the last reported sale price of the Company’s common stock on the NASDAQ Global Market on June 10, 2008, subject to adjustment under certain circumstances, at any time beginning on March 15, 2013 or under certain other circumstances and prior to the close of business on the business day immediately preceding the final maturity date of the notes. The 5.375% Notes were convertible for cash up to their principal amount and shares of the Company’s common stock for the remainder of the conversion value in excess of the principal amount.

The Company recorded a debt discount of $26.9 million to equity to reflect the value of its nonconvertible debt borrowing rate of 14.5% per annum. This debt discount was amortized as non-cash interest expense over the five year term of the 5.375% Notes. The Company incurred deferred financing costs related to this offering of approximately $3.5 million, of which $1.1 million has been reclassified as an offset to the value of the amount allocated to equity. The remainder was recorded as other assets in the consolidated balance sheet and was amortized as non-cash interest expense over the five year term of the 5.375% Notes.

In June 2011, in connection with the issuance of $143.8 million in principal amount of 3.75% Convertible Notes due June 15, 2016 (the “3.75% Notes”), the Company repurchased $70 million in principal amount of the 5.375% Notes for $85.1 million, a 21.5% premium on the principal amount. The investors that held the $70 million in principal amount of repurchased 5.375% Notes purchased $59.5 million in principal amount of the 3.75% Notes and retained approximately $13.5 million in principal amount of the remaining 5.375% Notes. These investors’ combined $73.0 million in principal amount of convertible debt ($13.5 million of 5.375% Notes and $59.5 million of 3.75% Notes) was considered to be a modification of a portion of the 5.375% Notes. See “3.75% Convertible Senior Notes” below for additional detail on the modification accounting.

In May 2013, the Company entered into an Exchange Agreement with a holder of its 5.375% Notes. Under the Exchange Agreement, the Company purchased $13 million in principal amount of the 5.375% Notes in exchange for 620,122 shares of the Company's common stock and a cash payment of $0.3 million, representing the accrued and unpaid interest. Furthermore, the Company recorded a loss on extinguishment of debt of $0.3 million in interest and other expense in the three and six months ended June 30, 2013.

In June 2013, the Company repaid the remaining outstanding principal and accrued interest on the 5.375% Notes in accordance with the terms. In addition to a cash payment of $2.1 million, representing principal and accrued and unpaid interest, the Company issued 26,523 shares of its common stock to the holders, representing the conversion value in excess of the principal amount as per the original terms of the 5.375% Notes.

Cash interest expense related to the 5.375% Notes was $0.1 million and $0.2 million in the three month periods ended June 30, 2013 and 2012, respectively. Cash interest expense related to the 5.375% Notes was $0.3 million and $0.4 million in the six month periods ended June 30, 2013 and 2012, respectively.

As of June 30, 2013, the 5.375% Notes were repaid in full and no amounts remain on the Company's balance sheet related to these notes.

3.75% Convertible Senior Notes

In June 2011, the Company sold $143.8 million in principal amount of the 3.75% Notes. The interest rate on the notes is 3.75% per annum, payable semi-annually in arrears in cash on December 15 and June 15 of each year. The 3.75% Notes are convertible into the Company’s common stock at an initial conversion rate of 38.1749 shares of common stock per $1,000 principal amount of the 3.75% Notes, which is equivalent to a conversion price of approximately $26.20 per share, subject to adjustment under certain circumstances. The 3.75% Notes are convertible prior to March 15, 2016 only upon the occurrence of certain circumstances. On and after March 15, 2016 and prior to the close of business on the second scheduled trading day immediately preceding the final maturity date of the 3.75% Notes, the notes may be converted without regard to the occurrence of any such circumstances. The 3.75% Notes and any unpaid interest will be convertible at the Company’s option for cash, shares of the Company’s common stock or a combination of cash and shares of the Company’s common stock for the principal amount. The Company intends to settle the principal in cash.

The Company may not redeem the 3.75% Notes prior to June 20, 2014. From June 20, 2014 to June 20, 2015 the Company may redeem the 3.75% Notes, at its option, in whole or in part, only if the last reported sale price per share of the Company’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days during a period of 30 consecutive trading days. On and after June 20, 2015, the Company may redeem the 3.75% Notes, at its option (without regard to such sale price condition), in whole or in part. If a fundamental change, as defined in the Indenture for the 3.75% Notes, occurs at any time prior to maturity, holders of the 3.75% Notes may require the Company to repurchase their

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notes in whole or in part, for cash equal to 100% of the principal amount of the 3.75% Notes to be repurchased, plus accrued and unpaid interest. If a holder elects to convert its 3.75% Notes upon the occurrence of a make-whole fundamental change, as defined in the Indenture for the 3.75% Notes, the holder may be entitled to receive an additional number of shares of common stock on the conversion date. These additional shares are intended to compensate the holders for the loss of the time value of the conversion option and are set forth in the Indenture to the 3.75% Notes. In no event will the number of shares issuable upon conversion of a note exceed 50.5816 per $1,000 principal amount (subject to adjustment as described in the Indenture for the 3.75% Notes). The 3.75% Notes are unsecured.

The Company identified certain features related to a portion of the 3.75% Notes, including the holders’ ability to require the Company to repurchase their notes and the higher interest payments required in an event of default, which are considered embedded derivatives and should be bifurcated and accounted for at fair value. The Company assesses the value of each of these embedded derivatives at each balance sheet date. At June 30, 2013, the Company separately accounted for and determined that these derivatives had de minimus value.

In connection with the issuance of the 3.75% Notes, the Company repurchased $70 million in principal amount of the 5.375% Notes for $85.1 million, a 21.5% premium on the principal amount. The investors that held the $70 million in principal amount of repurchased 5.375% Notes purchased $59.5 million in principal amount of the 3.75% Notes and retained approximately $13.5 million in principal amount of the remaining 5.375% Notes. This transaction was treated as a modification of a portion of the 5.375% Notes. The Company accounted for this modification of existing debt separately from the issuance of the remainder of the 3.75% Notes.

Prior to the transaction, the $70 million in principal amount of repurchased 5.375% Notes had a debt discount of $10.5 million. This amount remained in debt discount related to the $73 million in principal amount of modified debt. The Company recorded additional debt discount of $15.1 million related to the premium payment in connection with the repurchase and $0.2 million related to the increase in the value of the conversion feature. The portion of the debt discount related to the value of the conversion feature was recorded as additional paid-in capital. The total debt discount of $25.8 million related to the modified debt is being amortized as non-cash interest expense at the effective rate of 16.5% over the five year term of the modified debt. The Company paid transaction fees of approximately $2.0 million related to the modification, which were recorded as interest expense at the time of the modification.

Of the $143.8 million in principal amount of 3.75% Notes issued in June 2011, $84.3 million in principal amount was considered to be an issuance of new debt. The Company recorded a debt discount of $26.6 million related to the $84.3 million in principal amount of 3.75% Notes. The debt discount was recorded as additional paid-in capital to reflect the value of its nonconvertible debt borrowing rate of 12.4% per annum. This debt discount is being amortized as non-cash interest expense over the five year term of the 3.75% Notes. The Company incurred deferred financing costs related to this offering of approximately $2.8 million, of which $0.9 million has been reclassified as an offset to the value of the amount allocated to equity. The remainder is recorded as other assets in the consolidated balance sheet and is being amortized as non-cash interest expense over the five year term of the 3.75% Notes.

Cash interest expense related to the $143.8 million in principal amount of 3.75% Notes was $1.4 million in each of the three month periods ended June 30, 2013 and 2012. Cash interest expense related to the $143.8 million in principal amount of 3.75% Notes was$2.7 million in each of the six month periods ended June 30, 2013 and 2012.

As of June 30, 2013 the Company included $108.7 million on its balance sheet in long-term debt related to the 3.75% Notes. The 3.75% Notes have a remaining term of 3 years.

4. Capital Lease Obligation

In June 2013 the Company acquired approximately $4.3 million of manufacturing equipment under a capital lease. The obligation under the capital lease will be repaid in equal monthly installments over the 36 month term of the lease and includes principal and interest payments with an effective interest rate of 17% . The underlying assets have been recorded at their fair value of $4.3 million and included in equipment on the Company's balance sheet as of June 30, 2013. The assets acquired under capital leases are being amortized on a straight-line basis over 5 years in accordance with the Company's policy for depreciation of manufacturing equipment. Amortization expense on assets acquired under capital leases is included with depreciation expense.

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The aggregate future minimum lease payments related to these capital leases as of June 30, 2013, are as follows (in thousands):

Year Ending December 31,	Minimum Lease Payments
2013 (remaining)	906
2014	1,812
2015	1,812
2016	906
Total	$	5,436

There was no interest expense recorded on the capital lease in the three and six months ended June 30, 2013.

5. Net Loss Per Share

Basic net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding for the period, excluding unvested restricted common shares. Diluted net loss per share is computed using the weighted average number of common shares outstanding and, when dilutive, potential common share equivalents from options, restricted stock units and warrants (using the treasury-stock method), and potential common shares from convertible securities (using the if-converted method). Because the Company reported a net loss for the three and six months ended June 30, 2013 and 2012, all potential common shares have been excluded from the computation of the diluted net loss per share for all periods presented, as the effect would have been anti-dilutive. Such potentially dilutive common share equivalents consist of the following:

	Three and Six Months Ended June 30,
	2013	2012
5.375% Convertible Senior Notes	702,701	702,701
3.75% Convertible Senior Notes	5,487,642	5,487,642
Unvested restricted stock units	1,058,032	860,319
Outstanding options	2,283,054	2,855,080
Outstanding warrants	62,752	62,752
Total dilutive common shares	9,594,181	9,968,494

6. Accounts Receivable

Accounts receivable consist of amounts due from third-party payors, patients, third-party distributors and government agencies. The Company records an allowance for doubtful accounts at the time potential collection risk is identified. The Company estimates its allowance based on historical experience, assessment of specific risk, discussions with individual customers or various assumptions and estimates that are believed to be reasonable under the circumstances. The Company believes the reserve is adequate to mitigate current collection risk.

As of June 30, 2013 accounts receivable from one customer represented 13% of gross accounts receivable. As of December 31, 2012 accounts receivable from two customers represented approximately 18% and 11% of gross accounts receivable, respectively.

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The components of accounts receivable are as follows:

	As of
	June 30, 2013			December 31, 2012
	(In thousands)
Trade receivables	$	40,434		$	39,921
Allowance for doubtful accounts	(6,784		)	(6,627		)
Total accounts receivable	$	33,650		$	33,294

7. Inventories

Inventories consist of the following:

	As of
	June 30, 2013		December 31, 2012
	(In thousands)
Raw materials	$	1,422	$	1,487
Work-in-process	365		1,595
Finished goods	4,192		11,785
Total inventories	$	5,979	$	14,867

8. Other Intangible Assets

Other intangible assets consist of the following:

	As of
	June 30, 2013			December 31, 2012
	(In thousands)
Customer relationships	$	30,100		$	30,100
Tradename	2,800			2,800
Total intangible assets	32,900			32,900
Less: accumulated amortization	(12,633		)	(9,937		)
Total	$	20,267		$	22,963

The Company recorded $32.9 million of other intangible assets in the year ended December 31, 2011 as a result of the acquisition of Neighborhood Diabetes. The Company determined that the estimated useful life of the customer relationships asset is 10 years and is amortizing the asset over that period using an estimated cash flow pattern. The Company determined that the useful life of the Neighborhood Diabetes tradename is 15 years and is amortizing the asset over that period on a straight-line basis. Accumulated amortization on the customer relationship asset was $12.2 million and $9.6 million as of June 30, 2013 and December 31, 2012, respectively. Accumulated amortization on the tradename asset was $0.4 million and $0.3 million as of June 30, 2013 and December 31, 2012, respectively. Amortization expense was approximately $1.3 million and $1.5 million for the three months ended June 30, 2013 and 2012, respectively. Amortization expense was approximately $2.7 million and $3.2 million for the six months ended June 30, 2013 and 2012, respectively. Amortization expense for the year ending December 31, 2013 is expected to be approximately $4.9 million. As of June 30, 2013, the weighted average amortization period of the Company’s intangible assets is approximately 9 years.

In April 2013, the Company was notified that Neighborhood Diabetes was not offered a contract under the Center for Medicare & Medicaid Services ("CMS") national mail-order competition of the Medicare Durable Medical Equipment, Prosthetics, Orthotics, and Supplies ("DMEPOS") Competitive Bidding Program. As of July 1, 2013, the program

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implementation date, the Company is no longer eligible to provide certain mail-order diabetic testing supplies such as blood glucose testing strips and lancets to Medicare beneficiaries. The Company performed an analysis of the future undiscounted cash flows of its customer relationship and tradename assets and determined that the carrying value of the assets is recoverable. No impairment of these intangible assets was recorded in the six months ended June 30, 2013.

9. Goodwill

The Company follows the provisions of FASB ASC Topic 350-20, Intangibles – Goodwill and Other (“ASC 350-20”). ASC 350-20 requires companies to use the purchase method of accounting for all business combinations initiated after June 30, 2001, and establishes specific criteria for the recognition of intangible assets separately from goodwill. Goodwill and indefinite-lived assets are tested for impairment at least annually. In accordance with ASC 350-20, the Company tests goodwill for impairment on an annual basis or whenever events and circumstances indicate there might be an impairment. The Company’s goodwill arose in connection with the acquisition of Neighborhood Diabetes in June 2011. No goodwill impairment was recorded in the six months ended June 30, 2013.

10. Product Warranty Costs

The Company provides a four-year warranty on its PDMs and may replace any OmniPods that do not function in accordance with product specifications. Warranty expense is estimated and recorded in the period that shipment occurs. The expense is based on the Company’s historical experience and the estimated cost to service the claims. A reconciliation of the changes in the Company’s product warranty liability is as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	(In thousands)
Balance at the beginning of the period	$	2,249		$	2,033		$	1,992		$	1,960
Warranty expense	785			348			1,661			1,222
Warranty claims settled	(633		)	(559		)	(1,252		)	(1,360		)
Balance at the end of the period	$	2,401		$	1,822		$	2,401		$	1,822

	As of
	June 30, 2013		December 31, 2012
	(In thousands)
Composition of balance:
Short-term	$	934	$	863
Long-term	1,467		1,129
	$	2,401	$	1,992

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11. Commitments and Contingencies

Operating Leases

The Company leases its facilities in Massachusetts, New York, Florida, and Singapore. The Company’s leases are accounted for as operating leases. The leases generally provide for a base rent plus real estate taxes and certain operating expenses related to the leases. The Company has extended the leases of its facilities in Bedford and Billerica, Massachusetts. Following the extensions, these leases expire in September 2014. The leases for Bedford contain a five-year renewal option and escalating payments over the life of the lease.

During the year ended December 31, 2012, the Company terminated a lease for one of its corporate office spaces in Bedford, Massachusetts. The lease termination resulted in no material impact to the financial statements. During the same period, the Company entered into a new lease agreement for an additional 26,500 square feet in Bedford, Massachusetts. This lease expires in September 2014 and includes escalating payments over its term. During the six months ended June 30, 2013, the Company extended the lease of its Woburn location. Following the extension, the lease expires in December 2014. The leases in Singapore, Florida, and New York expire in July 2013, December 2013, and April 2015, respectively.

Certain of the Company’s operating lease agreements contain scheduled rent increases, which are being amortized over the terms of the agreements using the straight-line method and are included in other liabilities in the accompanying consolidated balance sheet. The aggregate future minimum lease payments related to these leases as of June 30, 2013, are as follows (in thousands):

Year Ending December 31,	Minimum Lease Payments
2013 (remaining)	690
2014	1,046
2015	45
Total	$	1,781

Legal Proceedings

In August 2010, Becton, Dickinson and Company (“BD”), filed a lawsuit in the United States District Court in the State of New Jersey against the Company alleging that the OmniPod System infringes three of its patents. BD seeks a declaration that the Company has infringed its patents, equitable relief, including an injunction that would enjoin the Company from infringing these patents and an unspecified award for monetary damages. The Company believes that the OmniPod System does not infringe these patents. The Company expects that this litigation will not have a material adverse impact on its financial position or results of operations. The Company believes it has meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the ultimate outcome or effect of this action. The Company does not believe it has any material financial exposure with regard to this action at June 30, 2013.

In a letter received in March 2007, Medtronic, Inc. invited the Company to discuss its “taking a license to certain Medtronic patents.” In October 2012, Medtronic MiniMed Inc., Medtronic Puerto Rico Operations Co. and MiniMed Distribution Corp. (collectively, “Medtronic”) filed a lawsuit in United States District Court for the Central District of California alleging that the Company infringes the two patents referenced in their 2007 letter which are owned by Medtronic MiniMed Inc. and licensed to Medtronic Puerto Rico Operations Co. and MiniMed Distribution Corp. Medtronic seeks a declaration that the Company has infringed its patents, equitable relief, including an injunction that would enjoin the Company from infringing these patents and an unspecified award for monetary damages. The patents referenced by this lawsuit relate to technology that is material to the Company’s business. The Company believes that the OmniPod System does not infringe these patents. The Company believes it has meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the ultimate outcome or effect of this action. The Company does not believe it has any material financial exposure with regard to this action at June 30, 2013.

In April 2013, Rydex Technologies LLC (“Rydex”), a non-practicing entity, filed a lawsuit in the United States District Court in the State of Delaware against the Company alleging that certain of its products, including the OmniPod System, infringe one of its patents. Rydex seeks a declaration that the Company has infringed its patent and an unspecified award for monetary damages. The Company believes that the OmniPod System does not infringe this patent. The Company expects that this litigation will not have a material adverse impact on its financial position or results of operations. The Company believes it has meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the

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ultimate outcome or effect of this action. The Company does not believe it has any material financial exposure with regard to this action at June 30, 2013.

Indemnifications

In the normal course of business, the Company enters into contracts and agreements that contain a variety of representations and warranties and provide for general indemnifications. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. To date, the Company has not paid any claims or been required to defend any action related to its indemnification obligations. However, the Company may record charges in the future as a result of these indemnification obligations.

In accordance with its bylaws, the Company has indemnification obligations to its officers and directors for certain events or occurrences, subject to certain limits, while they are serving at the Company’s request in such capacity. There have been no claims to date, and the Company has a director and officer insurance policy that enables it to recover a portion of any amounts paid for future claims.

At June 30, 2013, the Company is subject to an on-going sales and use tax audit by the Massachusetts Department of Revenue related to Neighborhood Diabetes for a period prior to the acquisition. Under the Merger Agreement, the Company has been indemnified by the former Stockholders of Neighborhood Diabetes for any liability resulting from or related to any tax attributable to pre-acquisition periods. The Company has recorded a contingent liability in current liabilities and a corresponding indemnification asset in current assets related to the estimated sales tax payable to the state of Massachusetts for the period under audit.

12. Equity

In January 2013, in a public offering, the Company issued and sold 4,715,000 shares of its common stock at a price of $20.75 per share. In connection with the offering, the Company received total gross proceeds of $97.8 million, or approximately $92.8 million in net proceeds after deducting underwriting discounts and offering expenses.

In May 2013, the Company entered into an Exchange Agreement with a holder of its 5.375% Notes. Under the Exchange Agreement, the Company issued 620,122 shares of its common stock to the holder in exchange for the extinguishment of $13 million in principal amount of the 5.375% Notes. In June 2013, in connection with the repayment of the remaining $2 million in principal amount of the 5.375% Notes, the Company issued 26,523 shares of its common stock to the holders representing the conversion value in excess of the principal amount as per the conversion terms of the 5.375% Notes.

The Company grants share-based awards to employees in the form of options to purchase the Company’s common stock, the ability to purchase stock at a discounted price under the employee stock purchase plan and restricted stock units. Stock-based compensation expense related to share-based awards recognized in the three month periods ended June 30, 2013 and 2012 was $3.8 million and $2.5 million, respectively, and was calculated based on awards ultimately expected to vest. Stock-based compensation expense related to share-based awards recognized in the six month periods ended June 30, 2013 and 2012 was $6.8 million and $5.1 million, respectively, and was calculated based on awards ultimately expected to vest. At June 30, 2013, the Company had $30.1 million of total unrecognized compensation expense related to stock options and restricted stock units.

Stock Options

In May 2007, in conjunction with the Company's initial public offering, the Company adopted its 2007 Stock Option and Incentive Plan (the "2007 Plan"). The Company originally reserved 535,000 shares of common stock for issuance under the 2007 Plan in which the amount was increased on each January 1 through January 1, 2012 by 725,000 shares. The 2007 Plan was amended and restated in November 2008 and May 2012 to provide for the issuance of additional shares and to amend certain other provisions. In May 2012, shares available for grant under the 2007 Plan were increased by 3,775,000 shares.

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The following summarizes the activity under the Company’s stock option plans:

	Number of Options (#)		Weighted Average Exercise Price ($)		Aggregate Intrinsic Value ($)
					(In thousands)
Balance, December 31, 2012	2,502,190		$	13.51
Granted	240,400		24.55
Exercised	(411,698	)	10.85		$	6,568	(1	)
Canceled	(47,838	)	19.55
Balance, June 30, 2013	2,283,054		$	15.02	$	37,410
Vested, June 30, 2013	1,385,193		$	11.91	$	27,006	(2	)
Vested and expected to vest, June 30, 2013 (3)	1,957,919				$	33,474	(2	)

(1) The aggregate intrinsic value was calculated based on the positive difference between the fair market value of the Company’s common stock as of the date of exercise and the exercise price of the underlying options.

(2) The aggregate intrinsic value was calculated based on the positive difference between the fair market value of the Company’s common stock as of June 30, 2013 and the exercise price of the underlying options.

(3) Represents the number of vested options as of June 30, 2013, plus the number of unvested options expected to vest as of June 30, 2013, based on the unvested options outstanding as of June 30, 2013, adjusted for the estimated forfeiture rate of 16%.

At June 30, 2013 there were 2,283,054 options outstanding with a weighted average exercise price of $15.02 per share and a weighted average remaining contractual life of 6.9 years. At June 30, 2013 there were 1,385,193 options exercisable with a weighted average exercise price of $11.91 per share and a weighted average remaining contractual life of 5.7 years.

Employee stock-based compensation expense related to stock options recognized in each of the three month periods ended June 30, 2013 and 2012 was $1.3 million and was based on awards ultimately expected to vest. Employee stock-based compensation expense related to stock options recognized in each of the six month periods ended June 30, 2013 and 2012 was $2.5 million and was based on awards ultimately expected to vest. At June 30, 2013, the Company had $9.5 million of total unrecognized compensation expense related to stock options that will be recognized over a weighted average period of 1.3 years.

Employee Stock Purchase Plan

As of June 30, 2013 and 2012 the Company had 6,390 shares and 8,882 shares, respectively, contingently issued under the employee stock purchase plan (“ESPP”). In the three and six months ended June 30, 2013 and 2012, the Company recorded no significant stock-based compensation charges related to the ESPP.

Restricted Stock Units

In the six months ended June 30, 2013, the Company awarded 563,475 restricted stock units to certain employees and directors. The restricted stock units were granted under the 2007 Plan and vest annually over three to four years from the grant date. Of the 563,475 restricted stock units granted during the period, 142,000 restricted stock units were granted as performance-based awards that are probable of being achieved and vest over a three year period once certain performance criteria are met. The restricted stock units granted have a weighted average fair value of $23.92 per share based on the closing price of the Company’s common stock on the date of grant. The restricted stock units granted during the six months ended June 30, 2013 were valued at approximately $13.5 million on their grant date, and the Company is recognizing the compensation expense over the vesting period. Approximately $2.5 million and $1.3 million of stock-based compensation expense related to the vesting of restricted stock units was recognized in the three months ended June 30, 2013 and 2012, respectively. Approximately $4.3 million and $2.7 million of stock-based compensation expense related to the vesting of restricted stock units was recognized in the six months ended June 30, 2013 and 2012, respectively. Approximately $20.6 million of the fair value of the restricted stock units remained unrecognized as of June 30, 2013 and will be recognized over a weighted average period of 1.7 years. Under the terms of the awards, the Company will issue shares of common stock on each of the vesting dates.

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The following table summarizes the status of the Company’s restricted stock units:

	Number of Shares (#)		Weighted Average Fair Value ($)
Balance, December 31, 2012	825,068		$	18.40
Granted	563,475		23.92
Vested	(288,824	)	17.49
Forfeited	(41,687	)	19.88
Balance, June 30, 2013	1,058,032		$	21.53

13. Income Taxes

The Company accounts for income taxes under ASC 740-10. Deferred income tax assets and liabilities are determined based upon differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reversed. A valuation allowance is required to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. At June 30, 2013 and December 31, 2012, the Company provided a valuation allowance for the full amount of its net deferred tax asset because realization of any future tax benefit was not sufficiently assured.

Income tax expense consists of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Current	$	88	$	43	$	191	$	63
Deferred	30		26		58		52
Total	$	118	$	69	$	249	$	115

In the three and six months ended June 30, 2013 and 2012, the current portion of income tax expense primarily relates to state, local and foreign taxes and the deferred portion primarily relates to federal and state tax amounts.

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes as well as federal and state net operating losses and tax credit carryforwards. At June 30, 2013 and December 31, 2012, the Company included $0.5 million of current deferred tax assets in prepaid expenses and other current assets. At June 30, 2013 and December 31, 2012, the Company included $0.7 million of non-current deferred tax liabilities in other long-term liabilities on its balance sheet.

In the future, the Company will generate additional deferred tax assets and liabilities related to its amortization of acquired intangible assets for tax purposes because these long-lived intangible assets are not amortized for financial reporting purposes. The tax amortization in future years will give rise to a temporary difference and a tax liability, which will only reverse at the time of ultimate sale or further impairment of the underlying intangible assets. Due to the uncertain timing of this reversal, the temporary difference cannot be considered as a source of future taxable income for purposes of determining a valuation allowance; therefore, the tax liability cannot be used to offset the deferred tax asset related to the net operating loss carryforward for tax purposes that will be generated by the same amortization.

The Company had $0.1 million of unrecognized tax benefits at June 30, 2013 and December 31, 2012. Unrecognized tax benefits represent tax positions for which reserves have been established. Unrecognized state benefits and interest related to unrecognized tax benefits are reflected net of applicable tax benefits. The Company expects its uncertain tax positions will reduce by approximately $0.1 million over the next twelve months.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

You should read the following discussion of our financial condition and results of operations in conjunction with our consolidated financial statements and the accompanying notes to those financial statements included in this Quarterly Report on Form 10-Q . This Quarterly Report on Form 10-Q contains forward-looking statements which are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933 and of Section 21E of the Securities Exchange Act of 1934. These forward-looking statements are based on our current expectations and beliefs concerning future developments and their potential effects on us. There can be no assurance that future developments affecting us will be those that we have anticipated. These forward-looking statements involve a number of risks, uncertainties (some of which are beyond our control) or other assumptions that may cause actual results or performance to be materially different from those expressed or implied by these forward-looking statements. These risks and uncertainties include, but are not limited to: risks associated with our dependence on the OmniPod System; our ability to reduce production costs and increase customer orders and manufacturing volumes; adverse changes in general economic conditions; impact of healthcare reform legislation; our inability to raise additional funds in the future on acceptable terms or at all; potential supply problems or price fluctuations with sole source or other third-party suppliers on which we are dependent; failure by us to retain supplier pricing discounts and achieve satisfactory gross margins; failure by us to retain key supplier and payor partners; international business risks; our inability to obtain adequate coverage or reimbursement from third-party payors for the OmniPod System and potential adverse changes in reimbursement rates or policies relating to the OmniPod; failure to retain key partner payors and their members; failure to retain and manage successfully our Medicare and Medicaid business; potential adverse effects resulting from competition with competitors; technological innovations adversely affecting our business; potential termination of our license to incorporate a blood glucose meter into the OmniPod System; our ability to protect our intellectual property and other proprietary rights; conflicts with the intellectual property of third parties, including claims that our current or future products infringe the proprietary rights of others; adverse regulatory or legal actions relating to the OmniPod System; failure of our contract manufacturers or component suppliers to comply with FDA’s quality system regulations, the potential violation of federal or state laws prohibiting “kickbacks” or protecting patient health information, or any challenges to or investigations into our practices under these laws; product liability lawsuits that may be brought against us; reduced retention rates; unfavorable results of clinical studies relating to the OmniPod System or the products of our competitors; potential future publication of articles or announcement of positions by physician associations or other organizations that are unfavorable to our products; the concentration of substantially all of our manufacturing capacity at a single location in China and substantially all of our inventory at a single location in Massachusetts; our ability to attract and retain key personnel; our ability to manage our growth; fluctuations in quarterly results of operations; risks associated with potential future acquisitions; our ability to generate sufficient cash to service all of our indebtedness; the expansion of our distribution network; our ability to successfully maintain effective internal controls; the volatility of our common stock; risks related to future sales of our common stock or the conversion of the 3.75% Notes; potential limitations on our ability to use our net operating loss carryforwards; anti-takeover provisions in our organizational documents; and other risks and uncertainties described in our Annual Report on Form 10-K , which was filed with the Securities and Exchange Commission on February 28, 2013 in the section entitled “Risk Factors,” and in our other filings from time to time with the Securities and Exchange Commission. Should one or more of these risks or uncertainties materialize, or should any of our assumptions prove incorrect, actual results may vary in material respects from those projected in these forward-looking statements. We undertake no obligation to publicly update or revise any forward-looking statements.

Overview

We are primarily engaged in the development, manufacturing and sale of our proprietary OmniPod Insulin Management System (the “OmniPod System”), an innovative, discreet and easy-to-use insulin infusion system for people with insulin-dependent diabetes. The OmniPod System is the only commercially-available insulin infusion system of its kind. The OmniPod System features a unique disposable tubeless OmniPod which is worn on the body for approximately three days at a time and the handheld, wireless Personal Diabetes Manager (“PDM”). Conventional insulin pumps require people with insulin-dependent diabetes to learn to use, manage and wear a number of cumbersome components, including up to 42 inches of tubing. In contrast, the OmniPod System features two discreet, easy-to-use devices that eliminate the need for a bulky pump, tubing and separate blood glucose meter, provides for virtually pain-free automated cannula insertion, communicates wirelessly and integrates a blood glucose meter. We believe that the OmniPod System’s unique proprietary design offers significant lifestyle benefits to people with insulin-dependent diabetes.

In June 2011, we acquired Neighborhood Holdings, Inc. and its wholly-owned subsidiaries (collectively, "Neighborhood Diabetes") in order to support our sales of the OmniPod System, expand our full suite diabetes management product offerings and obtain access to a larger number of insulin dependent patients. Through Neighborhood Diabetes, we are

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able to provide customers with blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals and have the ability to process claims as either durable medical equipment or through pharmacy benefits.

We began commercial sale of the OmniPod System in the United States in October 2005. We sell the OmniPod System and other diabetes management supplies in the United States through direct sales to customers or through our distribution partners. The OmniPod System is currently available in multiple countries in Europe through our exclusive distribution partner, Ypsomed Distribution AG (“Ypsomed”) and in Canada through our exclusive distribution partner, GlaxoSmithKline Inc. (“GSK”). In August 2011, we received CE Mark approval, and in December 2012 we received 510(k) clearance by the FDA for our new OmniPod System. The new OmniPod System is more than one-third smaller and one-quarter lighter than the original model, while maintaining the same features and operating capabilities. Ypsomed began selling the new OmniPod System in certain European countries in 2012. We began selling the new OmniPod System to new customers in the U.S. during the first quarter of 2013 and began converting the existing customer base during the second quarter of 2013.

We sell our proprietary OmniPod System as well as blood glucose testing supplies, traditional insulin pumps, pump supplies, pharmaceuticals and other products for the management and treatment of diabetes to people with diabetes. Through our infrastructure in the reimbursement, billing and collection areas, we are able to provide for adjudication of claims as either durable medical equipment or through pharmacy benefits. Claims are adjudicated under private insurers, Medicaid or Medicare. As we expand our sales and marketing focus, increase our manufacturing capacity, expand to additional international markets and broaden our high-touch patient model, we will need to maintain and expand available reimbursement for our product offerings.

Our sales and marketing effort is focused on generating demand and acceptance of the OmniPod System among key diabetes practitioners, academic medical centers, clinics, people with insulin-dependent diabetes, third-party payors, government agencies, and third-party distributors. Our marketing strategy is to build awareness for the benefits of the OmniPod System as well as our high-touch patient model through a wide range of education programs, social networking, patient demonstration programs, support materials, media advertisements and events at the national, regional and local levels. We are using third-party distributors to improve our access to managed care and government reimbursement programs, expand our commercial presence and provide access to additional potential patients. Our total revenue was $60.1 million and $117.4 million for the three and six months ended June 30, 2013, respectively. Our total revenue was $51.0 million and $98.8 million for the three and six months ended June 30, 2012, respectively.

We currently produce the OmniPod System on partially automated manufacturing lines at a facility in China operated by a subsidiary of Flextronics International Ltd. (“Flextronics”). We purchase complete OmniPods pursuant to our agreement with Flextronics. Under the agreement, Flextronics has agreed to supply us, as a non-exclusive supplier, with OmniPods at agreed upon prices per unit pursuant to a rolling forecast that we provide. The current term of the agreement expires in December 2017 and is automatically renewed for one-year terms subsequently. It may be terminated upon prior written notice given no less than a specified number of days prior to the date of termination. The specified number of days is intended to provide the parties with sufficient time to make alternative arrangements in the event of termination.

To achieve profitability, we continue to seek to increase manufacturing volume and reduce the per-unit production cost for the OmniPod. By increasing production volumes of the OmniPod, we have been able to reduce our per-unit raw material costs and improve absorption of manufacturing overhead costs. Our new OmniPod was designed to lower the cost of the product further through component sourcing, volume discounts and efficient manufacturing. The cost reductions are important as we strive to achieve profitability. We believe our current manufacturing capacity is sufficient to meet our expected 2013 demand for OmniPods.

We purchase certain other diabetes management supplies from manufacturers at contracted rates and supply these products to our customers. Based on market penetration, payor plans and other factors, certain manufacturers provide rebates based on product sold. We record these rebates as a reduction to cost of goods sold as they are earned.

Since our inception in 2000, we have incurred losses every quarter. In the three and six months ended June 30, 2013, we incurred net losses of $10.5 million and $21.2 million, respectively. As of June 30, 2013, we had an accumulated deficit of $502.7 million. We have financed our operations through private placements of debt and equity securities, public offerings of our common stock, issuances of convertible debt and borrowings under certain other debt agreements. As of June 30, 2013, we had $143.8 million of convertible debt outstanding which matures in June 2016.

Our long-term financial objective is to achieve and sustain profitable growth. Our efforts in the coming months of 2013 will be focused primarily on the production of, and customer transition to, our new OmniPod System as well as the expansion of our customer base in the United States and internationally. Achieving these objectives is expected to require additional investments in certain personnel and initiatives. We believe that we will continue to incur net losses in the near term

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in order to achieve these objectives. However, we believe that the accomplishment of our near term objectives will have a positive impact on our financial condition in the future.

In January 2013, we sold 4.7 million shares of our common stock at a price of $20.75 per share, resulting in net proceeds to us of $92.8 million. We believe that our cash and cash equivalents, together with the cash expected to be generated from product sales, will be sufficient to meet our projected operating and debt service requirements for the next twelve months.

Financial Operations Overview

Revenue. We derived most of our revenue from the sale of the OmniPod System and other diabetes related products including blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals to customers and third-party distributors who resell the product to customers. The OmniPod System is comprised of two devices: the OmniPod, a disposable insulin infusion device that the patient wears for up to three days and then replaces; and the PDM, a handheld device much like a personal digital assistant that wirelessly programs the OmniPod with insulin delivery instructions, assists the patient with diabetes management and incorporates a blood glucose meter.

In June 2011, we entered into a development agreement with a U.S. based pharmaceutical company (the “Development Agreement”). Under the Development Agreement, we are required to perform design, development, regulatory, and other services to support the pharmaceutical company as it works to obtain regulatory approval to use our drug delivery technology as a delivery method for its pharmaceutical. Over the term of the Development Agreement, we have and expect to continue to invoice amounts as we meet certain defined deliverable milestones. Revenue on the Development Agreement is recognized using a proportional performance methodology based on costs incurred and total payments under the agreement. The impact of changes in the expected total effort or contract payments are recognized as a change in estimate using the cumulative catch-up method.

As of June 30, 2013 and December 31, 2012, we had deferred revenue of $0.9 million and $5.4 million, respectively. These amounts include product-related revenue and unrecognized amounts related to the Development Agreement.

For the year ending December 31, 2013 we expect our revenue to continue to increase as we transition our customers to our new OmniPod System, leverage our high-touch patient model to gain new customers in the United States and continue expansion in Europe, Canada and certain other international markets. Increased revenue will be dependent upon the success of our sales efforts, our ability to produce our new OmniPods in sufficient volumes as our patient base grows, the successful transition to our new OmniPod System, the impact of competive bidding on certain durable medical equipment items including mail-order diabetes testings supplies, and other risks and uncertainties.

Cost of revenue. Cost of revenue consists primarily of raw material, labor, warranty and overhead costs such as freight, depreciation and other costs related to the OmniPod System, the cost of products we acquire from third party suppliers, and costs incurred related to the Development Agreement. Cost of revenue will continue to increase in line with an increase in revenue.

Research and development. Research and development expenses consist primarily of personnel costs within our product development, regulatory and clinical functions, and the costs of clinical studies and product development projects. We expense all research and development costs as incurred. For the year ending December 31, 2013, we expect overall research and development spending to slightly decrease from our 2012 spend as we drive to align our activities with our on-going development projects.

General and administrative. General and administrative expenses consist primarily of salaries and other related costs for personnel serving the executive, finance, information technology and human resource functions, as well as legal fees, accounting fees, insurance costs, bad debt expenses, shipping, handling and facilities-related costs. We expect general and administrative expenses to increase in the year ending December 31, 2013 as compared to 2012 to support our overall growth.

Sales and marketing. Sales and marketing expenses consist primarily of personnel costs within our sales, marketing, reimbursement support, customer support and training functions, sales commissions paid to our sales representatives and costs associated with participation in medical conferences, physician symposia and promotional activities, including distribution of units used in our demonstration kit programs. We expect sales and marketing expenses to increase in the year ending December 31, 2013 as compared to 2012 as we continue expansion of our commercial organization to enhance the growth of our existing business as we continue to educate healthcare providers and transition our customers to our new OmniPod System.

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Results of Operations

The following table presents certain statement of operations information for the three and six months ended June 30, 2013 and 2012:

	Three Months Ended June 30,								Six Months Ended June 30,
	2013			2012			% Change		2013			2012			% Change
	(In thousands)								(In thousands)
Revenue	$	60,092		$	51,035		18	%	$	117,448		$	98,789		19	%
Cost of revenue	33,259			28,704			16	%	65,460			56,162			17	%
Gross profit	26,833			22,331			20	%	51,988			42,627			22	%
Operating expenses:
Research and development	5,174			6,521			21	%	9,570			11,953			20	%
General and administrative	13,901			12,665			10	%	26,995			25,685			5	%
Sales and marketing	13,580			13,664			1	%	27,451			26,403			4	%
Total operating expenses	32,655			32,850			1	%	64,016			64,041			—	%
Operating loss	(5,822		)	(10,519		)	45	%	(12,028		)	(21,414		)	44	%
Other expense, net	(4,579		)	(3,888		)	18	%	(8,907		)	(7,727		)	15	%
Income tax expense	(118		)	(69		)	71	%	(249		)	(115		)	117	%
Net loss	$	(10,519	)	$	(14,476	)	27	%	$	(21,184	)	$	(29,256	)	28	%

Comparison of the Three and Six Months ended June 30, 2013 and 2012

Revenue

Our total revenue was $60.1 million and $117.4 million for the three and six months ended June 30, 2013 compared to $51.0 million and $98.8 million for the same periods in 2012. The increase in the three and six month period is due to continued adoption of the OmniPod System by patients in the United States and internationally, as well as expansion of sales of other diabetes supplies to our existing patient base.

Cost of Revenue

Cost of revenue was $33.3 million and $65.5 million for the three and six months ended June 30, 2013 compared to $28.7 million and $56.2 million for the same periods in 2012. The increase in cost of revenue reflects the higher sales volumes as our patient base continues to increase.

Research and Development

Research and development expenses decreased $1.3 million, or 21%, to $5.2 million for the three months ended June 30, 2013, compared to $6.5 million for the same period in 2012. The decrease was primarily a result of a decrease of $2.0 million in outside services associated with the development and regulatory approval of the new OmniPod System, offset by a $0.5 million increase in employee related expenses, and a $0.2 million increase in supplies and consumables used in development efforts on our ongoing projects.

Research and development expenses decreased $2.4 million, or 20%, to $9.6 million for the six months ended June 30, 2013, compared to $12.0 million for the same period in 2012. The decrease was primarily a result of a decrease of $2.6 million in outside services associated with the development and regulatory approval of the new OmniPod System and a $0.2 million decrease in supplies and consumables used in development efforts on our ongoing projects, offset by a $0.5 million increase in employee related expenses.

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General and Administrative

General and administrative expenses increased $1.2 million, or 10%, to $13.9 million for the three months ended June 30, 2013 compared to $12.7 million for the same period in 2012. This increase was primarily the result of an increase of $0.7 million in bad debt expense, an increase of $0.6 million in employee related expenses including stock-based compensation, and an increase of $0.1 million in technology related fees and services. These increases were partially offset by a decrease of $0.3 million in amortization expense on the customer relationship asset related to the June 2011 acquisition of Neighborhood Diabetes.

General and administrative expenses increased $1.3 million, or 5%, to $27.0 million for the six months ended June 30, 2013 compared to $25.7 million for the same period in 2012. This increase was primarily the result of an increase of $1.1 million in bad debt expense, an increase of $0.8 million in employee related expenses including stock-based compensation, and an increase of $0.3 million related to sales and use tax compliance. These increases were partially offset by a decrease of $0.3 million in administrative and consulting fees and a decrease of $0.5 million in amortization expense on the customer relationship asset related to the June 2011 acquisition of Neighborhood Diabetes.

Sales and Marketing

Sales and marketing expenses remained consistent at $13.6 million for the three months ended June 30, 2013, compared to $13.7 million for the same period in 2012. Sales and marketing expenses increased $1.1 million, or 4%, to $27.5 million for the six months ended June 30, 2013, compared to $26.4 million for the same period in 2012. This increase was primarily a result of a $0.7 million increase in costs related to customer support functions and $0.3 million in strategic planning initiatives.

Other Expense, Net

Other expense, net mainly consists of interest income and interest and other expense. Net interest and other expense was $4.6 million for the three months ended June 30, 2013 compared to $3.9 million for the same period in 2012. Net interest and other expense was $8.9 million for the six months ended June 30, 2013 compared to $7.7 million for the same period in 2012. The increase in net interest and other expense is primarily the result of higher non-cash interest on the 5.375% Notes and the 3.75% Notes based on their effective interest rates and the $0.3 million charge recorded for the extinguishment of debt related to the exchange of 620,122 shares of common stock for $13 million in principal amount of the 5.375% Notes (as defined below).

Income Tax Expense

Income tax expense was $0.1 million for each of the three months ended June 30, 2013 and 2012. Income tax expense was $0.2 million and $0.1 million for the six months ended June 30, 2013 and 2012, respectively. Income tax expense is comprised of a current and deferred portion. The current portion primarily related to state, local and foreign taxes and the deferred portion primarily related to federal and state tax amounts.

Liquidity and Capital Resources

We commenced operations in 2000 and to date we have financed our operations primarily through private placements of common and preferred stock, secured indebtedness, public offerings of our common stock and issuances of convertible debt. As of June 30, 2013, we had $150.9 million in cash and cash equivalents. We believe that our current cash and cash equivalents, together with the cash expected to be generated from sales, will be sufficient to meet our projected operating and debt service requirements for at least the next twelve months.

Equity

In January 2013, in a public offering, we issued and sold 4,715,000 shares of our common stock at a price of $20.75 share. In connection with the offering, we received total gross proceeds of $97.8 million, or approximately $92.8 million in net proceeds after deducting underwriting discounts and offering expenses.

In May 2013, we entered into an Exchange Agreement with a holder of our 5.375% Notes. Under the Exchange Agreement, we issued 620,122 shares of our common stock to the holder in exchange for the extinguishment of $13 million in principal amount of the 5.375% Notes. In June 2013, in connection with the repayment of the remaining $2 million in principal amount of the 5.375% Notes, we issued 26,523 shares of our common stock to the holders representing the conversion value in excess of the principal amount as per the conversion terms of the 5.375% Notes.

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Debt

We had outstanding debt and related financing costs on our consolidated balance sheet as follows (in thousands):

	As of
	June 30, 2013			December 31, 2012
Principal amount of the 5.375% Convertible Senior Notes	$	—		$	15,000
Principal amount of the 3.75% Convertible Senior Notes	143,750			143,750
Unamortized discount	(35,080		)	(40,591		)
Total debt	108,670			118,159
Current portion of long-term debt	—			14,429
Long-term debt	$	108,670		$	103,730
Deferred financing costs	$	1,707		$	2,004

Interest and other expense related to the 5.375% Senior Notes (as defined below) and the 3.75% Senior Notes (as defined below) was included in interest and other expense on the consolidated statements of operations as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Contractual coupon interest	$	1,460	$	1,549	$	3,009	$	3,098
Accretion of debt discount	2,751		2,387		5,511		4,691
Loss on debt extinguishment	325		—		325		—
Amortization of debt issuance costs	149		149		297		297
Total interest and other expense	$	4,685	$	4,085	$	9,142	$	8,086

5.375% Convertible Senior Notes

In June 2008, we sold $85.0 million in principal amount of 5.375% Convertible Senior Notes due June 15, 2013 (the “5.375% Notes”) in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended. The interest rate on the notes was 5.375% per annum on the principal amount from June 16, 2008, payable semi-annually in arrears in cash on December 15 and June 15 of each year. The 5.375% Notes were convertible into our common stock at an initial conversion rate of 46.8467 shares of common stock per $1,000 principal amount of the 5.375% Notes, which is equivalent to a conversion price of approximately $21.35 per share, representing a conversion premium of 34% to the last reported sale price of our common stock on the NASDAQ Global Market on June 10, 2008, subject to adjustment under certain circumstances, at any time beginning on March 15, 2013 or under certain other circumstances and prior to the close of business on the business day immediately preceding the final maturity date of the notes. The 5.375% Notes were convertible for cash up to their principal amount and shares of our common stock for the remainder of the conversion value in excess of the principal amount.

We recorded a debt discount of $26.9 million to equity to reflect the value of our nonconvertible debt borrowing rate of 14.5% per annum. This debt discount was amortized as non-cash interest expense over the five year term of the 5.375% Notes. We incurred deferred financing costs related to this offering of approximately $3.5 million, of which $1.1 million has been reclassified as an offset to the value of the amount allocated to equity. The remainder was recorded as other assets in the consolidated balance sheet and was amortized as non-cash interest expense over the five year term of the 5.375% Notes.

In June 2011, in connection with the issuance of $143.8 million in principal amount of 3.75% Convertible Notes due June 2016 (the “3.75% Notes”), we repurchased $70 million in principal amount of the 5.375% Notes for $85.1 million, a 21.5% premium on the principal amount. The investors that held the $70 million in principal amount of repurchased 5.375% Notes purchased $59.5 million in principal amount of the 3.75% Notes and retained approximately $13.5 million in principal amount of the remaining 5.375% Notes. These investors’ combined $73.0 million in principal amount of convertible debt ($13.5 million of 5.375% Notes and $59.5 million of 3.75% Notes) was considered to be a modification of a portion of the 5.375% Notes. See the section entitled “3.75% Convertible Senior Notes” below.

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In May 2013, we entered into an Exchange Agreement with a holder of our 5.375% Notes. Under the Exchange Agreement, we purchased $13 million in principal amount of the 5.375% Notes in exchange for 620,122 shares of our common stock and a cash payment of $0.3 million, representing accrued and unpaid interest. Furthermore, we recorded a loss on extinguishment of debt of $0.3 million in interest and other expense in the three and six months ended June 30, 2013.

In June 2013, we repaid the remaining outstanding principal and accrued interest on the 5.375% Notes in accordance with their terms. In addition to a cash payment of $2.1 million, representing principal and accrued and unpaid interest, we issued 26,523 shares of our common stock to the holders representing the conversion value in excess of the principal amount as per the terms of Notes.

Cash interest expense related to the 5.375% Notes was $0.1 million and $0.2 million in the three month periods ended June 30, 2013 and 2012, respectively. Cash interest expense related to the 5.375% Notes was $0.3 million and $0.4 million in the six month periods ended June 30, 2013 and 2012, respectively.

3.75% Convertible Senior Notes

In June 2011, we sold $143.8 million in principal amount of the 3.75% Notes. The interest rate on the notes is 3.75% per annum, payable semi-annually in arrears in cash on December 15 and June 15 of each year. The 3.75% Notes are convertible into our common stock at an initial conversion rate of 38.1749 shares of common stock per $1,000 principal amount of the 3.75% Notes, which is equivalent to a conversion price of approximately $26.20 per share, subject to adjustment under certain circumstances. The 3.75% Notes are convertible prior to March 15, 2016 only upon the occurrence of certain circumstances. On and after March 15, 2016 and prior to the close of business on the second scheduled trading day immediately preceding the final maturity date of the 3.75% Notes, the notes may be converted without regard to the occurrence of any such circumstances. The 3.75% Notes and any unpaid interest will be convertible at our option for cash, shares of our common stock or a combination of cash and shares of our common stock for the principal amount. We intend to settle the principal in cash.

We may not redeem the 3.75% Notes prior to June 20, 2014. From June 20, 2014 to June 20, 2015, we may redeem the 3.75% Notes, at our option, in whole or in part, only if the last reported sale price per share of our common stock has been at least 130% of the conversion price then in effect for at least 20 trading days during a period of 30 consecutive trading days. On and after June 20, 2015, we may redeem the 3.75% Notes, at our option (without regard to such sale price condition), in whole or in part. If a fundamental change, as defined in the Indenture for the 3.75% Notes, occurs at any time prior to maturity, holders of the 3.75% Notes may require us to repurchase their notes in whole or in part for cash equal to 100% of the principal amount of the notes to be repurchased, plus accrued and unpaid interest. If a holder elects to convert their 3.75% Notes upon the occurrence of a make-whole fundamental change, as defined in the Indenture for the 3.75% Notes, the holder may be entitled to receive an additional number of shares of common stock on the conversion date. These additional shares are intended to compensate the holders for the loss of the time value of the conversion option and are set forth in the Indenture to the 3.75% Notes. In no event will the number of shares issuable upon conversion of a 3.75% Note exceed 50.5816 per $1,000 principal amount (subject to adjustment as described in the Indenture for the 3.75% Notes). The 3.75% Notes are unsecured.

We identified certain features related to a portion of the 3.75% Notes, including the holders’ ability to require us to repurchase their notes and the higher interest payments required in an event of default, which are considered embedded derivatives and should be bifurcated and accounted for at fair value. We assess the value of each of these embedded derivatives at each balance sheet date. At June 30, 2013, we determined that these derivatives had de minimus value.

In connection with the issuance of the 3.75% Notes, we repurchased $70 million in principal amount of the 5.375% Notes for $85.1 million, a 21.5% premium on the principal amount. The investors that held the $70 million in principal amount of repurchased 5.375% Notes purchased $59.5 million in principal amount of the 3.75% Notes and retained approximately $13.5 million in principal amount of the remaining 5.375% Notes. This transaction was treated as a modification of the existing 5.375% Notes. We accounted for this modification of a portion of the 5.375% Notes separately from the issuance of the remainder of the 3.75% Notes.

Prior to the transaction, the $70 million in principal amount of repurchased 5.375% Notes had a debt discount of $10.5 million. This amount remained in debt discount related to the $73 million in principal amount of modified debt. We recorded an additional debt discount of $15.1 million related to the premium payment in connection with the repurchase and $0.2 million related to the increase in the value of the conversion feature. The portion of the debt discount related to the value of the conversion feature was recorded as additional paid-in capital. The total debt discount of $25.8 million related to the modified debt is being amortized as non-cash interest expense at the effective rate of 16.5% over the five year term of the modified debt. We paid transaction fees of approximately $2.0 million related to the modification which were recorded as interest expense at the time of the modification.

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Of the $143.8 million in principal amount of 3.75% Notes issued in June 2011, $84.3 million in principal amount was considered to be an issuance of new debt. We recorded a debt discount of $26.6 million related to the $84.3 million in principal amount of 3.75% Notes. The debt discount was recorded as additional paid-in capital to reflect the value of our nonconvertible debt borrowing rate of 12.4% per annum. This debt discount is being amortized as non-cash interest expense over the five year term of the 3.75% Notes. We incurred deferred financing costs related to this offering of approximately $2.8 million, of which $0.9 million has been reclassified as an offset to the value of the amount allocated to equity. The remainder is recorded as other assets in the consolidated balance sheet and is being amortized as non-cash interest expense over the five year term of the 3.75% Notes.

Cash interest expense related to the $143.8 million in principal amount of 3.75% Notes was $1.4 million in each of the three month periods ended June 30, 2013 and 2012. Cash interest expense related to the $143.8 million in principal amount of 3.75% Notes was $2.7 million in each of the six month periods ended June 30, 2013 and 2012.

As of June 30, 2013, we included $108.7 million on our balance sheet in long-term debt related to the 3.75% Notes. The 3.75% Notes have a remaining term of 3 years.

Capital Lease

In June 2013, we acquired approximately $4.3 million of manufacturing equipment under a capital lease. The obligation under the capital lease will be repaid in equal monthly installments over the 36 month term of the lease and includes principal and interest payments with an effective interest rate of 17% . The underlying assets have been recorded at their fair value of $4.3 million and included in equipment on our balance sheet as of June 30, 2013. The assets acquired under capital leases are being amortized on a straight-line basis over 5 years in accordance with our policy for depreciation of manufacturing equipment. Amortization expense on assets acquired under capital leases is included with depreciation expense.

The aggregate future minimum lease payments related to these capital leases as of June 30, 2013, are as follows (in thousands):

Year Ending December 31,	Minimum Lease Payments
2013 (remaining)	906
2014	1,812
2015	1,812
2016	906
Total	$	5,436

There was no interest expense recorded on the capital lease in the three and six months ended June 30, 2013.

Operating Activities

The following table sets forth the amounts of cash provided by (used in) operating activities and net loss for each of the periods indicated:

	Six Months Ended June 30,
	2013			2012
	(In thousands)
Cash provided by (used in) operating activities	$	3,172		$	(20,017	)
Net loss	$	(21,184	)	$	(29,256	)

In the six months ended June 30, 2013, the net cash provided by operating activities was primarily attributable to our continued focus on profitability. In the six months ended June 30, 2012, the net cash used in operating activities was attributable primarily to the growth of our operations after adjustments for non-cash expenses. Adjustments for non-cash items were approximately $21.3 million and $17.1 million in the six months ended June 30, 2013 and 2012, respectively. Non-cash items mainly consist of depreciation and amortization, stock-based compensation and non-cash interest and other expense.

27

Cash provided by operations in the six months ended June 30, 2013 included a decrease in inventories of $8.9 million and an increase in accounts payable and accruals of $3.3 million, offset in part by a decrease of $4.5 million in deferred revenue, an increase in accounts receivable of $2.9 million and an increase in prepaid expenses and other current assets of $2.1 million. The decrease of inventories is largely related to the scale up of our manufacturing operations as we transition our customer base to our new OmniPod System. The decrease of deferred revenues relates to the recognition of revenue billed in prior periods as we meet the revenue recognition criteria. Uses of cash from operations in the six months ended June 30, 2012 include an increase in accounts receivable of $3.9 million and an increase in inventories of $4.6 million, offset in part by a increase in accounts payable and accruals of $2.7 million.

Investing and Financing Activities

The following table sets forth the amounts of cash used in investing activities and cash provided by financing activities for each of the periods indicated:

	Six Months Ended June 30,
	2013			2012
	(In thousands)
Cash used in investing activities	$	(2,695	)	$	(4,249	)
Cash provided by financing activities	$	93,174		$	455

Cash used in investing activities in the six months ended June 30, 2013 and 2012 was primarily for the purchase of manufacturing equipment for use in the production of our new OmniPod System.

Cash provided by financing activities in the six months ended June 30, 2013 was mainly related to the net proceeds from the issuance of common stock in connection with the public offering and exercise of employee stock options. Cash provided by financing activities in the six months ended June 30, 2012 mainly related to net proceeds from the issuance of common stock related to exercises of employee stock options offset by our payment of taxes in connection with the vesting of the restricted stock units in the period.

Commitments and Contingencies

We lease facilities in Massachusetts, New York, Florida, and Singapore. We account for these leases as operating leases. The leases generally provide for a base rent plus real estate taxes and certain operating expenses related to the leases. We have extended the leases of our facilities in Bedford and Billerica, Massachusetts. Following these extensions, these leases expire in September 2014. The leases for Bedford contain a five-year renewal option and escalating payments over the life of the leases.

During the year ended December 31, 2012, we terminated a lease for one of our corporate office spaces in Bedford, Massachusetts. The lease termination resulted in no material impact to our financial statements. During the same period, we entered into a new lease agreement for an additional 26,500 square feet in Bedford, Massachusetts. This lease expires in September 2014 and includes escalating payments over its term. During the six months ended June 30, 2013, we extended the lease of our Woburn location. Following the extension, the lease expires in December 2014. The leases in Singapore, Florida, and New York expire in July 2013, December 2013, and April 2015, respectively.

Certain of our operating lease agreements contain scheduled rent increases, which are being amortized over the terms of the agreements using the straight-line method and are included in other liabilities on our balance sheet.

The following table summarizes our principal obligations as of June 30, 2013 (in thousands):

	Payments Due in
Contractual Obligations	Total		2013 Remaining		2014		2015		2016
Operating lease obligations	$	1,781	$	690	$	1,046	$	45	$	—
Debt obligations (1)	159,697		2,694		5,391		5,391		146,221
Capital lease obligations (2)	5,436		906		1,812		1,812		906
Total contractual obligations	$	166,914	$	4,290	$	8,249	$	7,248	$	147,127

(1) The interest rate on the convertible debt is 3.75% per annum. We have included future payments of interest on the long-term debt in our obligations.

28

(2) The effective interest rate on the capital lease obligations is 17%. We have included future payments of interest on the capital lease in our obligations.

At June 30, 2013, we are subject to an on-going sales and use tax audit by the Massachusetts Department of Revenue related to Neighborhood Diabetes for a period prior to the acquisition. Under the Merger Agreement, we have been indemnified by the former Stockholders of Neighborhood Diabetes for any liability resulting from or related to any tax attributable to pre-acquisition periods. We have recorded a contingent liability in current liabilities and a corresponding indemnification asset in current assets related to the estimated sales tax payable to the state of Massachusetts for the period under audit.

Off-Balance Sheet Arrangements

As of June 30, 2013, we did not have any off-balance sheet financing arrangements.

Critical Accounting Policies and Estimates

Our financial statements are based on the selection and application of generally accepted accounting principles, which require us to make estimates and assumptions about future events that affect the amounts reported in our financial statements and the accompanying notes. Future events and their effects cannot be determined with certainty. Therefore, the determination of estimates requires the exercise of judgment. Actual results could differ from those estimates, and any such differences may be material to our financial statements. We have reviewed our policies and estimates to determine our critical accounting policies for the six months ended June 30, 2013. We have made no material changes to the critical accounting policies described in our Annual Report on Form 10-K for the year ended December 31, 2012.

Recent Accounting Pronouncements

In July 2012, the FASB issued ASU No. 2012-02 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU No. 2012-02”). ASU No. 2012-02 gives a company the option to first assess qualitative factors to determine whether it is more-likely-than-not that the indefinite-lived intangible is impaired. Qualitative factors include related events and circumstances that could affect the significant inputs used in determining the fair value of the indefinite-lived intangible asset. The guidance is effective in fiscal years beginning after September 15, 2012. We adopted the guidance in the first quarter of 2013. The adoption of the guidance did not have a material impact on our financial statements.

29

Item 3. Quantitative and Qualitative Disclosures about Market Risk

We do not use derivative financial instruments in our investment portfolio and have no foreign exchange contracts. Our financial instruments consist of cash, cash equivalents, accounts receivable, accounts payable, accrued expenses and long-term obligations. We consider investments that, when purchased, have a remaining maturity of 90 days or less to be cash equivalents. The primary objectives of our investment strategy are to preserve principal, maintain proper liquidity to meet operating needs and maximize yields. To minimize our exposure to an adverse shift in interest rates, we invest mainly in cash equivalents. We do not believe that a 10% change in interest rates would have a material impact on the fair value of our investment portfolio or our interest income.

As of June 30, 2013, we had outstanding debt recorded on our consolidated balance sheet of $143.8 million related to our 3.75% Notes and $4.3 million related to capital lease obligations. As the interest rates are fixed, changes in interest rates do not affect the value of our debt or capital lease obligations.

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Item 4. Controls and Procedures

Disclosure Controls and Procedures

As of June 30, 2013, our management conducted an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures, (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)) under the supervision and with the participation of our chief executive officer and chief financial officer. In designing and evaluating our disclosure controls and procedures, we and our management recognize that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and our management necessarily was required to apply its judgment in evaluating and implementing possible controls and procedures. Based upon that evaluation of our disclosure controls and procedures as of June 30, 2013, our chief executive officer and chief financial officer concluded that, as of such date, our disclosure controls and procedures were effective to provide reasonable assurance that material information required to be disclosed in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms, including ensuring that such material information is accumulated and communicated to our management, including our chief executive officer and our chief financial officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during the three months ended June 30, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II — OTHER INFORMATION

Item 1. Legal Proceedings

In August 2010, Becton, Dickinson and Company, (“BD”), filed a lawsuit in the United States District Court in the State of New Jersey against us alleging that the OmniPod Insulin Management System (the “OmniPod System”) infringes three of its patents. BD seeks a declaration that we have infringed its patents, equitable relief, including an injunction that would enjoin us from infringing these patents and an unspecified award for monetary damages. We believe that the OmniPod System does not infringe these patents. We do not expect this litigation to have a material adverse impact on our financial position or results of operations. We believe we have meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the ultimate outcome or effect of this action. We do not believe we have any material financial exposure with regard to this action at June 30, 2013.

In a letter received in March 2007, Medtronic, Inc. invited us to discuss our “taking a license to certain Medtronic patents.” In October 2012, Medtronic MiniMed Inc., Medtronic Puerto Rico Operations Co. and MiniMed Distribution Corp. (collectively, “Medtronic”) filed a lawsuit in United States District Court for the Central District of California alleging that we have infringed the two patents referenced in their 2007 letter which are owned by Medtronic MiniMed Inc. and licensed to Medtronic Puerto Rico Operations Co. and MiniMed Distribution Corp. Medtronic seeks a declaration that we infringe its patents, equitable relief, including an injunction that would enjoin us from infringing these patents and an unspecific award for monetary damages. The patents referenced by this lawsuit relate to technology that is material to our business. We believe that the OmniPod System does not infringe these patents. We believe we have meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the ultimate outcome or effect of this action. We do not believe we have any material financial exposure with regard to this action at June 30, 2013.

In April 2013, Rydex Technologies LLC (“Rydex”), a non-practicing entity, filed a lawsuit in the United States District Court in the State of Delaware against us alleging that certain of our products, including the OmniPod System, infringes one of its patents. Rydex seeks a declaration that we have infringed its patent and an unspecified award for monetary damages. We believe that the OmniPod System does not infringe this patent. We do not expect this litigation to have a material adverse impact on our financial position or results of operations. We believe we have meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the ultimate outcome of effect of this action. We do not believe we have any material financial exposure with regard to this action at June 30, 2013.

We are, from time to time, involved in the normal course of business in various legal proceedings, including intellectual property, contract employment and product liability suits. Although we are unable to quantify the exact financial impact of any of these matters, we believe that none of these currently pending matters will have an outcome material to our financial condition or business.

Item 1A. Risk Factors

In addition to the other information set forth in this report, you should carefully consider the factors discussed in Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2012, which could materially affect our business, financial condition or future results. These risks are not the only risks we face. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results. There have been no material changes in our risk factors from those disclosed in our Annual Report on Form 10-K for the year ended December 31, 2012.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

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Item 5. Other Information

None.

Item 6. Exhibits

Exhibit Number	Description of Document
10.1+	Amendment No. 2 to the Distribution Agreement, dated as of July 15, 2013, between Ypsomed Distribution AG and Insulet Corporation.
31.1	Certification of Duane DeSisto, President and Chief Executive Officer, pursuant to Rule 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Brian Roberts, Chief Financial Officer, pursuant to Rule 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Duane DeSisto, President and Chief Executive Officer, and Brian Roberts, Chief Financial Officer, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101§	The following materials from Insulet Corporation’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, formatted in XBRL (eXtensible Business Reporting Language), as follows:
	(i) Consolidated Balance Sheets as of June 30, 2013 and December 31, 2012 (Unaudited)
	(ii) Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2013 and June 30, 2012 (Unaudited)
	(iii) Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2013 and June 30, 2012 (Unaudited)
	(iv) Notes to Condensed Consolidated Financial Statements (Unaudited)

§	As provided in Rule 406T of Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933, as amended, and Section 18 of the Securities Exchange Act of 1934, as amended.
+	Application has been made to the Securities and Exchange Commission for confidential treatment of certain provisions. Omitted material for which confidential treatment has been requested has been filed separately with the Securities and Exchange Commission.

33

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	INSULET CORPORATION (Registrant)
Date: August 7, 2013	/s/ Duane DeSisto
	Duane DeSisto
	President and Chief Executive Officer (Principal Executive Officer)

Date: August 7, 2013	/s/ Brian Roberts
	Brian Roberts
	Chief Financial Officer (Principal Financial and Accounting Officer)

34

EX-10.1

Exhibit 10.1

AMENDMENT NO. 2 TO DISTRIBUTION AGREEMENT

This Amendment No. 2 (the “Second Amendment”) dated 15 July 2013 is entered

into by and between Ypsomed Distribution AG, (“Ypsomed”) and Insulet Corporation (“Insulet”) to amend the Distribution Agreement entered into between Insulet and Ypsomed, effective as of 4 January 2010 (as amended on 10 April 2012, the “Agreement”). Capitalized terms used herein but not otherwise defined shall have the meanings ascribed to them in the Agreement.

WHEREAS, Ypsomed and Insulet desire to further amend the Agreement.

NOW, THEREFORE, in consideration of the premises and mutual covenants contained in this Second Amendment and in the Agreement, Ypsomed and Insulet hereby agree as follows:

1. Section II of Exhibit II of the Agreement is hereby amended by adding the following three (3) countries to the list of countries in such Section II:

• Finland: launch date to be agreed upon by the Parties

• Italy: launch date to be agreed upon by the Parties; Insulet will use commercially reasonable efforts to have Product available by 31 March 2014, provided, however, that failure to have Product available by that date shall not be a basis for any equitable adjustment to the Calendar Year Minimums.

• United Arab Emirates (UAE): launch date to be agreed upon by the Parties

2. The Calendar Year Minimums And Pricing Table (along with explanatory text) of Section I of Exhibit III of the Agreement is amended and restated in its entirety as follows:

3.

I    CALENDAR YEAR MINIMUMS AND PRICING

Calendar Year	CALENDAR YEAR MINIMUM: PDMs	PDM Transfer Price ($US)	CALENDAR YEAR MINIMUM: PODS	POD Transfer Price ($US)
2013	[******]	[******]	[******]	[******]
2014	[******]	[******]	[******]	[******]
2014			[******]	[******]
2015	[******]	[******]	[******]	[******]
2015			[******]	[******]
2016			[******]	[******]

For the avoidance of doubt the Calendar Year Minimum for a Calendar Year is the sum of the values expressed in the table above for each Calendar Year. For example, the Calendar Year Minimum of PODS for 2014 is [******], where [******] are purchased by Distributor at a Transfer Price of $[*****] and [******] are purchased by Distributor at a Transfer Price of $[*****]. Distributor must purchase the Calendar Year Minimum of PODS at the higher Transfer Price before purchasing PODS at the lower Transfer Price regardless of the Calendar Year except in the event of delivery delays not caused by Distributor, in which case the lower Transfer Price shall be applicable.

SAMPLE PRICING

Demonstration Pod (box of 10 without single packaging)	$ [******]
Demonstration Pod (single Packaging)	$ [******]

USER GUIDE

User Guide $ [******]

STARTER KIT BOX WITH ACCESSORIES

Starter Kit Box with Accessories $ [******]

4. All other terms and conditions of the Agreement not specifically amended or modified hereby will remain in full force and effect.

[REMAINDER OF THIS PAGE INTENTIONALLY LEFT BLANK]

IN WITNESS WHEREOF, the parties have caused this Amendment to be signed by a duly authorized representative effective as of the date set forth above.

Insulet Corporation	Ypsomed Distribution AG
By: /s/ Duane DeSisto	By: /s/ Simon Michel
Name: Duane DeSisto	Name: Simon Michel
Title: President and CEO	Title: Senior Vice President
	By: /s/ Dr. Beat Maurer
	Name: Dr. Beat Maurer
	Title: Senior Vice President, Legal and IP

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Duane DeSisto, certify that:

(1) I have reviewed this Quarterly Report on Form 10-Q of Insulet Corporation;

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

(4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

(5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Duane DeSisto

Duane DeSisto

President and Chief Executive Officer

August 7, 2013

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Brian Roberts, certify that:

(1) I have reviewed this Quarterly Report on Form 10-Q of Insulet Corporation;

(2) Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

(3) Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

(4) The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

(5) The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

/s/ Brian Roberts

Brian Roberts

Chief Financial Officer

August 7, 2013

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. § 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, each of the undersigned officers of Insulet Corporation, a Delaware corporation (the “Company”), does hereby certify with respect to the Quarterly Report of the Company on Form 10-Q for the period ended June 30, 2013, as filed with the Securities and Exchange Commission (the “Report”) that, to his knowledge:

(1) the Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Duane DeSisto                                                 

Name: Duane DeSisto

Title: President and Chief Executive Officer

Date: August 7, 2013

/s/ Brian Roberts

Name: Brian Roberts

Title: Chief Financial Officer

Date: August 7, 2013

XML

Equity

6 Months Ended

Jun. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Equity

Equity

In January 2013, in a public offering, the Company issued and sold 4,715,000 shares of its common stock at a price of $20.75 per share. In connection with the offering, the Company received total gross proceeds of $97.8 million, or approximately $92.8 million in net proceeds after deducting underwriting discounts and offering expenses.

In May 2013, the Company entered into an Exchange Agreement with a holder of its 5.375% Notes. Under the Exchange Agreement, the Company issued 620,122 shares of its common stock to the holder in exchange for the extinguishment of $13 million in principal amount of the 5.375% Notes. In June 2013, in connection with the repayment of the remaining $2 million in principal amount of the 5.375% Notes, the Company issued 26,523 shares of its common stock to the holders representing the conversion value in excess of the principal amount as per the conversion terms of the 5.375% Notes.

The Company grants share-based awards to employees in the form of options to purchase the Company’s common stock, the ability to purchase stock at a discounted price under the employee stock purchase plan and restricted stock units. Stock-based compensation expense related to share-based awards recognized in the three month periods ended June 30, 2013 and 2012 was $3.8 million and $2.5 million, respectively, and was calculated based on awards ultimately expected to vest. Stock-based compensation expense related to share-based awards recognized in the six month periods ended June 30, 2013 and 2012 was $6.8 million and $5.1 million, respectively, and was calculated based on awards ultimately expected to vest. At June 30, 2013, the Company had $30.1 million of total unrecognized compensation expense related to stock options and restricted stock units.

Stock Options

In May 2007, in conjunction with the Company's initial public offering, the Company adopted its 2007 Stock Option and Incentive Plan (the "2007 Plan"). The Company originally reserved 535,000 shares of common stock for issuance under the 2007 Plan in which the amount was increased on each January 1 through January 1, 2012 by 725,000 shares. The 2007 Plan was amended and restated in November 2008 and May 2012 to provide for the issuance of additional shares and to amend certain other provisions. In May 2012, shares available for grant under the 2007 Plan were increased by 3,775,000 shares.

The following summarizes the activity under the Company’s stock option plans:

	Number of Options (#)		Weighted Average Exercise Price ($)		Aggregate Intrinsic Value ($)
					(In thousands)
Balance, December 31, 2012	2,502,190		$	13.51
Granted	240,400		24.55
Exercised	(411,698	)	10.85		$	6,568	(1	)
Canceled	(47,838	)	19.55
Balance, June 30, 2013	2,283,054		$	15.02	$	37,410
Vested, June 30, 2013	1,385,193		$	11.91	$	27,006	(2	)
Vested and expected to vest, June 30, 2013 (3)	1,957,919				$	33,474	(2	)

(1) The aggregate intrinsic value was calculated based on the positive difference between the fair market value of the Company’s common stock as of the date of exercise and the exercise price of the underlying options.

(2) The aggregate intrinsic value was calculated based on the positive difference between the fair market value of the Company’s common stock as of June 30, 2013 and the exercise price of the underlying options.

(3) Represents the number of vested options as of June 30, 2013, plus the number of unvested options expected to vest as of June 30, 2013, based on the unvested options outstanding as of June 30, 2013, adjusted for the estimated forfeiture rate of 16%.

At June 30, 2013 there were 2,283,054 options outstanding with a weighted average exercise price of $15.02 per share and a weighted average remaining contractual life of 6.9 years. At June 30, 2013 there were 1,385,193 options exercisable with a weighted average exercise price of $11.91 per share and a weighted average remaining contractual life of 5.7 years.

Employee stock-based compensation expense related to stock options recognized in each of the three month periods ended June 30, 2013 and 2012 was $1.3 million and was based on awards ultimately expected to vest. Employee stock-based compensation expense related to stock options recognized in each of the six month periods ended June 30, 2013 and 2012 was $2.5 million and was based on awards ultimately expected to vest. At June 30, 2013, the Company had $9.5 million of total unrecognized compensation expense related to stock options that will be recognized over a weighted average period of 1.3 years.

Employee Stock Purchase Plan

As of June 30, 2013 and 2012 the Company had 6,390 shares and 8,882 shares, respectively, contingently issued under the employee stock purchase plan (“ESPP”). In the three and six months ended June 30, 2013 and 2012, the Company recorded no significant stock-based compensation charges related to the ESPP.

Restricted Stock Units

In the six months ended June 30, 2013, the Company awarded 563,475 restricted stock units to certain employees and directors. The restricted stock units were granted under the 2007 Plan and vest annually over three to four years from the grant date. Of the 563,475 restricted stock units granted during the period, 142,000 restricted stock units were granted as performance-based awards that are probable of being achieved and vest over a three year period once certain performance criteria are met. The restricted stock units granted have a weighted average fair value of $23.92 per share based on the closing price of the Company’s common stock on the date of grant. The restricted stock units granted during the six months ended June 30, 2013 were valued at approximately $13.5 million on their grant date, and the Company is recognizing the compensation expense over the vesting period. Approximately $2.5 million and $1.3 million of stock-based compensation expense related to the vesting of restricted stock units was recognized in the three months ended June 30, 2013 and 2012, respectively. Approximately $4.3 million and $2.7 million of stock-based compensation expense related to the vesting of restricted stock units was recognized in the six months ended June 30, 2013 and 2012, respectively. Approximately $20.6 million of the fair value of the restricted stock units remained unrecognized as of June 30, 2013 and will be recognized over a weighted average period of 1.7 years. Under the terms of the awards, the Company will issue shares of common stock on each of the vesting dates.

The following table summarizes the status of the Company’s restricted stock units:

	Number of Shares (#)		Weighted Average Fair Value ($)
Balance, December 31, 2012	825,068		$	18.40
Granted	563,475		23.92
Vested	(288,824	)	17.49
Forfeited	(41,687	)	19.88
Balance, June 30, 2013	1,058,032		$	21.53

XML

Equity - Summary of Restricted Stock Units (Detail) (Restricted Stock Units, USD $)	6 Months Ended
	Jun. 30, 2013
Restricted Stock Units
Number of Shares
Beginning balance (in shares)	825,068
Granted (in shares)	563,475
Vested (in shares)	(288,824)
Forfeited (in shares)	(41,687)
Ending balance (in shares)	1,058,032
Weighted Average Fair Value
Beginning balance (in USD per share)	$ 18.40
Granted (in USD per share)	$ 23.92
Vested (in USD per share)	$ 17.49
Forfeited (in USD per share)	$ 19.88
Ending balance (in USD per share)	$ 21.53

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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenue	$ 60,092	$ 51,035	$ 117,448	$ 98,789
Cost of revenue	33,259	28,704	65,460	56,162
Gross profit	26,833	22,331	51,988	42,627
Operating expenses:
Research and development	5,174	6,521	9,570	11,953
General and administrative	13,901	12,665	26,995	25,685
Sales and marketing	13,580	13,664	27,451	26,403
Total operating expenses	32,655	32,850	64,016	64,041
Operating loss	(5,822)	(10,519)	(12,028)	(21,414)
Interest income	37	24	64	52
Interest and other expense	(4,616)	(3,912)	(8,971)	(7,779)
Other expense, net	(4,579)	(3,888)	(8,907)	(7,727)
Loss before income taxes	(10,401)	(14,407)	(20,935)	(29,141)
Income tax expense	(118)	(69)	(249)	(115)
Net loss	$ (10,519)	$ (14,476)	$ (21,184)	$ (29,256)
Net loss per share basic and diluted	$ (0.20)	$ (0.30)	$ (0.40)	$ (0.61)
Weighted-average number of shares used in calculating net loss per share	53,834,707	47,824,190	53,445,715	47,715,819

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Net Loss Per Share

6 Months Ended

Jun. 30, 2013

Disclosure Potential Common Shares Excluded From Computation Of Diluted Net Loss Per Share [Abstract]

Net Loss Per Share

Net Loss Per Share

Basic net loss per share is computed by dividing net loss by the weighted average number of common shares outstanding for the period, excluding unvested restricted common shares. Diluted net loss per share is computed using the weighted average number of common shares outstanding and, when dilutive, potential common share equivalents from options, restricted stock units and warrants (using the treasury-stock method), and potential common shares from convertible securities (using the if-converted method). Because the Company reported a net loss for the three and six months ended June 30, 2013 and 2012, all potential common shares have been excluded from the computation of the diluted net loss per share for all periods presented, as the effect would have been anti-dilutive. Such potentially dilutive common share equivalents consist of the following:

	Three and Six Months Ended June 30,
	2013	2012
5.375% Convertible Senior Notes	702,701	702,701
3.75% Convertible Senior Notes	5,487,642	5,487,642
Unvested restricted stock units	1,058,032	860,319
Outstanding options	2,283,054	2,855,080
Outstanding warrants	62,752	62,752
Total dilutive common shares	9,594,181	9,968,494

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Inventories (Tables)

6 Months Ended

Jun. 30, 2013

Components of Inventories

Inventories consist of the following:

	As of
	June 30, 2013		December 31, 2012
	(In thousands)
Raw materials	$	1,422	$	1,487
Work-in-process	365		1,595
Finished goods	4,192		11,785
Total inventories	$	5,979	$	14,867

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Income Taxes

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company accounts for income taxes under ASC 740-10. Deferred income tax assets and liabilities are determined based upon differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reversed. A valuation allowance is required to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. At June 30, 2013 and December 31, 2012, the Company provided a valuation allowance for the full amount of its net deferred tax asset because realization of any future tax benefit was not sufficiently assured.

Income tax expense consists of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Current	$	88	$	43	$	191	$	63
Deferred	30		26		58		52
Total	$	118	$	69	$	249	$	115

In the three and six months ended June 30, 2013 and 2012, the current portion of income tax expense primarily relates to state, local and foreign taxes and the deferred portion primarily relates to federal and state tax amounts.

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes as well as federal and state net operating losses and tax credit carryforwards. At June 30, 2013 and December 31, 2012, the Company included $0.5 million of current deferred tax assets in prepaid expenses and other current assets. At June 30, 2013 and December 31, 2012, the Company included $0.7 million of non-current deferred tax liabilities in other long-term liabilities on its balance sheet.

In the future, the Company will generate additional deferred tax assets and liabilities related to its amortization of acquired intangible assets for tax purposes because these long-lived intangible assets are not amortized for financial reporting purposes. The tax amortization in future years will give rise to a temporary difference and a tax liability, which will only reverse at the time of ultimate sale or further impairment of the underlying intangible assets. Due to the uncertain timing of this reversal, the temporary difference cannot be considered as a source of future taxable income for purposes of determining a valuation allowance; therefore, the tax liability cannot be used to offset the deferred tax asset related to the net operating loss carryforward for tax purposes that will be generated by the same amortization.

The Company had $0.1 million of unrecognized tax benefits at June 30, 2013 and December 31, 2012. Unrecognized tax benefits represent tax positions for which reserves have been established. Unrecognized state benefits and interest related to unrecognized tax benefits are reflected net of applicable tax benefits. The Company expects its uncertain tax positions will reduce by approximately $0.1 million over the next twelve months.

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Equity - Additional Information (Detail) (USD $)	1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013	May 31, 2013	Jan. 31, 2013	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of common stock issued and sold			4,715,000
Common stock price per share			$ 20.75
Proceeds from Issuance of Common Stock			$ 97,800,000			$ 97,605,000	$ 1,642,000
Proceeds of Issuance of Common Stock Net of Expenses			92,800,000
Shares Issued with debt conversion	26,523	620,122
Stock-based compensation expense				3,800,000	2,500,000	6,800,000	5,100,000
Total unrecognized compensation expense	30,100,000			30,100,000		30,100,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				1,300,000	1,300,000	2,500,000	2,500,000
Total unrecognized compensation expense	9,500,000			9,500,000		9,500,000
5.375% Convertible Notes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Prinicpal amount of debt converted		13,000,000
Repayment of remaining principal of 5.375% Notse	$ 2,000,000

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Accounts Receivable Narrative (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2013 customer	Dec. 31, 2012 customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number Of Customers With Greater Than Ten Percent Accounts Receivable Balance	1	2
Concentration Risk, Percentage	29.00%	19.00%
Customer One
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	13.00%	18.00%
Customer Two
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage		11.00%

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Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Aggregate Future Minimum Lease Payments

The aggregate future minimum lease payments related to these leases as of June 30, 2013, are as follows (in thousands):

Year Ending December 31,	Minimum Lease Payments
2013 (remaining)	690
2014	1,046
2015	45
Total	$	1,781

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Product Warranty Costs (Tables)

6 Months Ended

Jun. 30, 2013

Reconciliation of Changes in Product Warranty Liability

A reconciliation of the changes in the Company’s product warranty liability is as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	(In thousands)
Balance at the beginning of the period	$	2,249		$	2,033		$	1,992		$	1,960
Warranty expense	785			348			1,661			1,222
Warranty claims settled	(633		)	(559		)	(1,252		)	(1,360		)
Balance at the end of the period	$	2,401		$	1,822		$	2,401		$	1,822

	As of
	June 30, 2013		December 31, 2012
	(In thousands)
Composition of balance:
Short-term	$	934	$	863
Long-term	1,467		1,129
	$	2,401	$	1,992

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Commitments and Contingencies - Additional Information (Detail)	6 Months Ended				6 Months Ended
	Jun. 30, 2013	Aug. 31, 2010 Becton Dickinson and Company Patents patent	Mar. 31, 2007 Medtronic MiniMed Inc Patents patent	Apr. 30, 2013 Rydex Technologies LLC Patents patent	Jun. 30, 2013 Bedford, Massachusetts sqft	Jun. 30, 2013 Billerica, Massachusetts	Jun. 30, 2013 Woburn, Massachusetts	Jun. 30, 2013 Singapore	Jun. 30, 2013 FLORIDA	Jun. 30, 2013 New York State
Operating Leased Assets [Line Items]
Renewal Option Terms Additional Period	5 years
Lease expiration date					2014-09	2014-09	2014-12	2013-07	2013-12	2015-04
Lease facility area					26,500
Number of patents allegedly infringed		3	2	1

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Debt - Narrative (Detail) (USD $)	1 Months Ended				3 Months Ended		6 Months Ended
	Jun. 30, 2013	May 31, 2013	Jun. 30, 2011	Jun. 30, 2008	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Debt Instrument [Line Items]
Shares Issued with debt conversion	26,523	620,122
Debt discount	$ 35,080,000				$ 35,080,000		$ 35,080,000		$ 40,591,000
Loss on debt extinguishment					325,000	0	325,000	0
Short-term portion of long-term debt	0				0		0		14,429,000
Long-term debt	108,670,000				108,670,000		108,670,000		103,730,000
Investor
Debt Instrument [Line Items]
Modified debt held by investors in the Notes			73,000,000
5.375% Convertible Notes
Debt Instrument [Line Items]
Principal amount of Senior Notes	0			85,000,000	0		0		15,000,000
Interest Paid		300,000
Debt, interest rate				5.375%
Debt, maturity date				Jun. 15, 2013
Frequency of interest payment				semi-annually
Debt conversion rate				46.8467
Principal amount per note used in conversion rate				1,000
Conversion price, per share				$ 21.35
Debt instrument convertible premium				34.00%
Debt discount			10,500,000	26,900,000
Nonconvertible debt borrowing rate				14.50%
Debt discount amortization period				5 years
Deferred financing costs				3,500,000
Finance costs reclassified against equity				1,100,000
Deferred financing costs, amortization period				5 years
Principal payments of long term debt			85,100,000
Repurchase premium			21.50%
Prinicpal amount of debt converted		13,000,000
Loss on debt extinguishment					300,000		325,000
Repayment of remaining prinicpal amount including interest	2,100,000
Interest expense related to Notes					100,000	200,000	300,000	400,000
5.375% Convertible Notes | Investor
Debt Instrument [Line Items]
Principal amount of Senior Notes			70,000,000
Modified debt held by investors in the Notes			13,500,000
5.375% Convertible Notes | Semi Annual Payment, First Payment
Debt Instrument [Line Items]
Interest payment date			December 15
5.375% Convertible Notes | Semi Annual Payment, Second Payment
Debt Instrument [Line Items]
Interest payment date			June 15
3.75% Convertible Notes
Debt Instrument [Line Items]
Principal amount of Senior Notes	143,750,000		143,800,000		143,750,000		143,750,000		143,750,000
Debt, interest rate			3.75%
Debt, maturity date			Jun. 15, 2016
Frequency of interest payment			semi-annually
Debt conversion rate			38.1749
Principal amount per note used in conversion rate			1,000
Conversion price, per share			$ 26.20
Percentage of the principal amount of the notes to be repurchased, if a fundamental change occurs			100.00%
Deferred financing costs, amortization period			5 years
Interest expense related to Notes					1,400,000	1,400,000	2,700,000	2,700,000
Remaining term of debt							3 years 0 months
Percentage required of the last reported sale price per share of the Company's common stock for redemption			130.00%
Number of trading days			20 days
Number of consecutive trading days			30 days
3.75% Convertible Notes | Maximum
Debt Instrument [Line Items]
Debt conversion rate			50.5816
Principal amount per note used in conversion rate			1,000
3.75% Convertible Notes | Investor
Debt Instrument [Line Items]
Modified debt held by investors in the Notes			59,500,000
3.75% Convertible Notes | Debt discount related to premium payment in connection with the purchase
Debt Instrument [Line Items]
Debt discount			15,100,000
3.75% Convertible Notes | Debt discount related to the increase in the value of the conversion feature.
Debt Instrument [Line Items]
Debt discount			200,000
3.75% Convertible Notes | Modified Debt
Debt Instrument [Line Items]
Debt discount			25,800,000
Nonconvertible debt borrowing rate			16.50%
Debt discount amortization period			5 years
Transaction fees			2,000,000
3.75% Convertible Notes | New Debt
Debt Instrument [Line Items]
Debt discount			26,600,000
Nonconvertible debt borrowing rate			12.40%
Debt discount amortization period			5 years
Deferred financing costs			2,800,000
Finance costs reclassified against equity			900,000
Principal debt amount issued to new investors			$ 84,300,000
3.75% Convertible Notes | Semi Annual Payment, First Payment
Debt Instrument [Line Items]
Interest payment date			December 15
3.75% Convertible Notes | Semi Annual Payment, Second Payment
Debt Instrument [Line Items]
Interest payment date			June 15

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Other Intangible Assets - Components of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 32,900	$ 32,900
Less: Accumulated amortization	(12,633)	(9,937)
Total	20,267	22,963
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	30,100	30,100
Less: Accumulated amortization	(12,200)	(9,600)
Tradename
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,800	2,800
Less: Accumulated amortization	$ (400)	$ (300)

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Equity - Stock Option Activity (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Number of Options
Beginning balance (in shares)	2,502,190
Granted (in shares)	240,400
Exercised (in shares)	(411,698)
Canceled (in shares)	(47,838)
Ending balance (in shares)	2,283,054
Vested, at end of period (in shares)	1,385,193
Vested and expected to vest, at end of period (in shares)	1,957,919	[1]
Weighted Average Exercise Price
Beginning balance (in USD per share)	$ 13.51
Granted (in USD per share)	$ 24.55
Exercised (in USD per share)	$ 10.85
Canceled (in USD per share)	$ 19.55
Ending balance (in USD per share)	$ 15.02
Vested, at end of period (in USD per share)	$ 11.91
Aggregate Intrinsic Value
Exercised	$ 6,568	[2]
Ending balance	37,410
Vested, at end of period	27,006	[3]
Vested and expected to vest, at end of period	$ 33,474	[3]
Estimated forfeiture rate	16.00%

[1] Represents the number of vested options as of June 30, 2013, plus the number of unvested options expected to vest as of June 30, 2013, based on the unvested options outstanding as of June 30, 2013, adjusted for the estimated forfeiture rate of 16%.

[2] The aggregate intrinsic value was calculated based on the positive difference between the fair market value of the Company’s common stock as of the date of exercise and the exercise price of the underlying options.

[3] The aggregate intrinsic value was calculated based on the positive difference between the fair market value of the Company’s common stock as of June 30, 2013 and the exercise price of the underlying options.

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Summary of Significant Accounting Policies (Detail) (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013 location customer	Jun. 30, 2013 segment location customer	Dec. 31, 2012 customer
Significant Accounting Policies [Line Items]
Intangible assets	$ 20,267,000	$ 20,267,000	$ 22,963,000
Product warranty term for PDMs	4 years	4 years
Right of return period for Starter Kits sales		45 days
Deferred revenue	900,000	900,000	5,400,000
Number of accredited financial institutions which the Company maintains the majority of its cash	2	2
Number of Single Source Suppliers	1	1	1
Number of operating segment		1
Concentration Risk, Percentage		29.00%	19.00%
Maximum
Significant Accounting Policies [Line Items]
Number of Open Tax Years		4 years
Minimum
Significant Accounting Policies [Line Items]
Number of Open Tax Years		3 years
Neighborhood Diabetes | Tradename
Significant Accounting Policies [Line Items]
Intangible assets	2,400,000	2,400,000
Neighborhood Diabetes | Tradename | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life		15 years
Neighborhood Diabetes | Customer relationships
Significant Accounting Policies [Line Items]
Intangible assets	$ 17,900,000	$ 17,900,000
Neighborhood Diabetes | Customer relationships | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life		10 years

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Product Warranty Costs - Narrative (Detail)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Schedule of Accrued Liabilities [Line Items]
Product warranty term for PDMs	4 years	4 years

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Other Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2013

Components of Other Intangible Assets

Other intangible assets consist of the following:

	As of
	June 30, 2013			December 31, 2012
	(In thousands)
Customer relationships	$	30,100		$	30,100
Tradename	2,800			2,800
Total intangible assets	32,900			32,900
Less: accumulated amortization	(12,633		)	(9,937		)
Total	$	20,267		$	22,963

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Nature of the Business

6 Months Ended

Jun. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Nature of the Business

Nature of the Business

The Company is primarily engaged in the development, manufacturing and sale of its proprietary OmniPod Insulin Management System (the “OmniPod System”), an innovative, discreet and easy-to-use insulin infusion system for people with insulin-dependent diabetes. The OmniPod System is the only commercially-available insulin infusion system of its kind. The OmniPod System features a unique disposable tubeless OmniPod which is worn on the body for approximately three days at a time and the handheld, wireless Personal Diabetes Manager (“PDM”). Conventional insulin pumps require people with insulin-dependent diabetes to learn to use, manage and wear a number of cumbersome components, including up to 42 inches of tubing. In contrast, the OmniPod System features two discreet, easy-to-use devices that eliminate the need for a bulky pump, tubing and separate blood glucose meter, provides for virtually pain-free automated cannula insertion, communicates wirelessly and integrates a blood glucose meter.

In June 2011, the Company acquired Neighborhood Holdings, Inc. and its wholly-owned subsidiaries (collectively, “Neighborhood Diabetes”) in order to support the sales of the OmniPod System, expand the Company’s full suite diabetes management product offerings and obtain access to a larger number of insulin dependent patients. Through Neighborhood Diabetes, the Company is able to provide customers with blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals and has the ability to process claims as either durable medical equipment or through pharmacy benefits.

The Company began commercial sale of the OmniPod System in the United States in October 2005. The Company has also expanded the availability of the OmniPod System internationally through its partnership with Ypsomed Distribution AG (“Ypsomed”) and GlaxoSmithKline (“GSK”). In January 2010, the Company entered into a distribution agreement with Ypsomed pursuant to which Ypsomed became the exclusive distributor of the OmniPod System in multiple countries. In February 2011, the Company entered into a distribution agreement with GSK pursuant to which GSK became the exclusive distributor of the OmniPod System in Canada.

In August 2011, the Company received CE Mark approval, and in December 2012 the Company received 510(k) clearance by the FDA for its new OmniPod System. The new OmniPod System is more than one-third smaller and one-quarter lighter than the original model, while maintaining the same features and operating capabilities. The Company began selling the new OmniPod System in certain countries in Europe through Ypsomed in 2012. The Company began selling the new OmniPod System to new customers in the U.S. during the first quarter of 2013 and began converting the existing customer base in the second quarter of 2013.

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Debt

6 Months Ended

Jun. 30, 2013

Debt Disclosure [Abstract]

Debt

Debt

The Company had outstanding convertible debt and related deferred financing costs on its consolidated balance sheet as follows (in thousands):

	As of
	June 30, 2013			December 31, 2012
Principal amount of the 5.375% Convertible Senior Notes	$	—		$	15,000
Principal amount of the 3.75% Convertible Senior Notes	143,750			143,750
Unamortized discount	(35,080		)	(40,591		)
Total long-term debt	108,670			118,159
Current portion of debt	—			14,429
Long-term debt	$	108,670		$	103,730
Deferred financing costs	$	1,707		$	2,004

Interest and other expense related to the 5.375% Notes (as defined below) and the 3.75% Notes (as defined below) was included in interest and other expense on the consolidated statements of operations as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Contractual coupon interest	$	1,460	$	1,549	$	3,009	$	3,098
Accretion of debt discount	2,751		2,387		5,511		4,691
Loss on debt extinguishment	325		—		325		—
Amortization of debt issuance costs	149		149		297		297
Total interest and other expense	$	4,685	$	4,085	$	9,142	$	8,086

5.375% Convertible Senior Notes

In June 2008, the Company sold $85 million in principal amount of 5.375% Convertible Senior Notes due June 15, 2013 (the “5.375% Notes”) in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended. The interest rate on the notes was 5.375% per annum on the principal amount from June 16, 2008, payable semi-annually in arrears in cash on December 15 and June 15 of each year. The 5.375% Notes were convertible into the Company’s common stock at an initial conversion rate of 46.8467 shares of common stock per $1,000 principal amount of the 5.375% Notes, which is equivalent to a conversion price of approximately $21.35 per share, representing a conversion premium of 34% to the last reported sale price of the Company’s common stock on the NASDAQ Global Market on June 10, 2008, subject to adjustment under certain circumstances, at any time beginning on March 15, 2013 or under certain other circumstances and prior to the close of business on the business day immediately preceding the final maturity date of the notes. The 5.375% Notes were convertible for cash up to their principal amount and shares of the Company’s common stock for the remainder of the conversion value in excess of the principal amount.

The Company recorded a debt discount of $26.9 million to equity to reflect the value of its nonconvertible debt borrowing rate of 14.5% per annum. This debt discount was amortized as non-cash interest expense over the five year term of the 5.375% Notes. The Company incurred deferred financing costs related to this offering of approximately $3.5 million, of which $1.1 million has been reclassified as an offset to the value of the amount allocated to equity. The remainder was recorded as other assets in the consolidated balance sheet and was amortized as non-cash interest expense over the five year term of the 5.375% Notes.

In June 2011, in connection with the issuance of $143.8 million in principal amount of 3.75% Convertible Notes due June 15, 2016 (the “3.75% Notes”), the Company repurchased $70 million in principal amount of the 5.375% Notes for $85.1 million, a 21.5% premium on the principal amount. The investors that held the $70 million in principal amount of repurchased 5.375% Notes purchased $59.5 million in principal amount of the 3.75% Notes and retained approximately $13.5 million in principal amount of the remaining 5.375% Notes. These investors’ combined $73.0 million in principal amount of convertible debt ($13.5 million of 5.375% Notes and $59.5 million of 3.75% Notes) was considered to be a modification of a portion of the 5.375% Notes. See “3.75% Convertible Senior Notes” below for additional detail on the modification accounting.

In May 2013, the Company entered into an Exchange Agreement with a holder of its 5.375% Notes. Under the Exchange Agreement, the Company purchased $13 million in principal amount of the 5.375% Notes in exchange for 620,122 shares of the Company's common stock and a cash payment of $0.3 million, representing the accrued and unpaid interest. Furthermore, the Company recorded a loss on extinguishment of debt of $0.3 million in interest and other expense in the three and six months ended June 30, 2013.

In June 2013, the Company repaid the remaining outstanding principal and accrued interest on the 5.375% Notes in accordance with the terms. In addition to a cash payment of $2.1 million, representing principal and accrued and unpaid interest, the Company issued 26,523 shares of its common stock to the holders, representing the conversion value in excess of the principal amount as per the original terms of the 5.375% Notes.

Cash interest expense related to the 5.375% Notes was $0.1 million and $0.2 million in the three month periods ended June 30, 2013 and 2012, respectively. Cash interest expense related to the 5.375% Notes was $0.3 million and $0.4 million in the six month periods ended June 30, 2013 and 2012, respectively.

As of June 30, 2013, the 5.375% Notes were repaid in full and no amounts remain on the Company's balance sheet related to these notes.

3.75% Convertible Senior Notes

In June 2011, the Company sold $143.8 million in principal amount of the 3.75% Notes. The interest rate on the notes is 3.75% per annum, payable semi-annually in arrears in cash on December 15 and June 15 of each year. The 3.75% Notes are convertible into the Company’s common stock at an initial conversion rate of 38.1749 shares of common stock per $1,000 principal amount of the 3.75% Notes, which is equivalent to a conversion price of approximately $26.20 per share, subject to adjustment under certain circumstances. The 3.75% Notes are convertible prior to March 15, 2016 only upon the occurrence of certain circumstances. On and after March 15, 2016 and prior to the close of business on the second scheduled trading day immediately preceding the final maturity date of the 3.75% Notes, the notes may be converted without regard to the occurrence of any such circumstances. The 3.75% Notes and any unpaid interest will be convertible at the Company’s option for cash, shares of the Company’s common stock or a combination of cash and shares of the Company’s common stock for the principal amount. The Company intends to settle the principal in cash.

The Company may not redeem the 3.75% Notes prior to June 20, 2014. From June 20, 2014 to June 20, 2015 the Company may redeem the 3.75% Notes, at its option, in whole or in part, only if the last reported sale price per share of the Company’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days during a period of 30 consecutive trading days. On and after June 20, 2015, the Company may redeem the 3.75% Notes, at its option (without regard to such sale price condition), in whole or in part. If a fundamental change, as defined in the Indenture for the 3.75% Notes, occurs at any time prior to maturity, holders of the 3.75% Notes may require the Company to repurchase their notes in whole or in part, for cash equal to 100% of the principal amount of the 3.75% Notes to be repurchased, plus accrued and unpaid interest. If a holder elects to convert its 3.75% Notes upon the occurrence of a make-whole fundamental change, as defined in the Indenture for the 3.75% Notes, the holder may be entitled to receive an additional number of shares of common stock on the conversion date. These additional shares are intended to compensate the holders for the loss of the time value of the conversion option and are set forth in the Indenture to the 3.75% Notes. In no event will the number of shares issuable upon conversion of a note exceed 50.5816 per $1,000 principal amount (subject to adjustment as described in the Indenture for the 3.75% Notes). The 3.75% Notes are unsecured.

The Company identified certain features related to a portion of the 3.75% Notes, including the holders’ ability to require the Company to repurchase their notes and the higher interest payments required in an event of default, which are considered embedded derivatives and should be bifurcated and accounted for at fair value. The Company assesses the value of each of these embedded derivatives at each balance sheet date. At June 30, 2013, the Company separately accounted for and determined that these derivatives had de minimus value.

In connection with the issuance of the 3.75% Notes, the Company repurchased $70 million in principal amount of the 5.375% Notes for $85.1 million, a 21.5% premium on the principal amount. The investors that held the $70 million in principal amount of repurchased 5.375% Notes purchased $59.5 million in principal amount of the 3.75% Notes and retained approximately $13.5 million in principal amount of the remaining 5.375% Notes. This transaction was treated as a modification of a portion of the 5.375% Notes. The Company accounted for this modification of existing debt separately from the issuance of the remainder of the 3.75% Notes.

Prior to the transaction, the $70 million in principal amount of repurchased 5.375% Notes had a debt discount of $10.5 million. This amount remained in debt discount related to the $73 million in principal amount of modified debt. The Company recorded additional debt discount of $15.1 million related to the premium payment in connection with the repurchase and $0.2 million related to the increase in the value of the conversion feature. The portion of the debt discount related to the value of the conversion feature was recorded as additional paid-in capital. The total debt discount of $25.8 million related to the modified debt is being amortized as non-cash interest expense at the effective rate of 16.5% over the five year term of the modified debt. The Company paid transaction fees of approximately $2.0 million related to the modification, which were recorded as interest expense at the time of the modification.

Of the $143.8 million in principal amount of 3.75% Notes issued in June 2011, $84.3 million in principal amount was considered to be an issuance of new debt. The Company recorded a debt discount of $26.6 million related to the $84.3 million in principal amount of 3.75% Notes. The debt discount was recorded as additional paid-in capital to reflect the value of its nonconvertible debt borrowing rate of 12.4% per annum. This debt discount is being amortized as non-cash interest expense over the five year term of the 3.75% Notes. The Company incurred deferred financing costs related to this offering of approximately $2.8 million, of which $0.9 million has been reclassified as an offset to the value of the amount allocated to equity. The remainder is recorded as other assets in the consolidated balance sheet and is being amortized as non-cash interest expense over the five year term of the 3.75% Notes.

Cash interest expense related to the $143.8 million in principal amount of 3.75% Notes was $1.4 million in each of the three month periods ended June 30, 2013 and 2012. Cash interest expense related to the $143.8 million in principal amount of 3.75% Notes was$2.7 million in each of the six month periods ended June 30, 2013 and 2012.

As of June 30, 2013 the Company included $108.7 million on its balance sheet in long-term debt related to the 3.75% Notes. The 3.75% Notes have a remaining term of 3 years.

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Accounts Receivable

6 Months Ended

Jun. 30, 2013

Receivables [Abstract]

Accounts Receivable

Accounts Receivable

Accounts receivable consist of amounts due from third-party payors, patients, third-party distributors and government agencies. The Company records an allowance for doubtful accounts at the time potential collection risk is identified. The Company estimates its allowance based on historical experience, assessment of specific risk, discussions with individual customers or various assumptions and estimates that are believed to be reasonable under the circumstances. The Company believes the reserve is adequate to mitigate current collection risk.

As of June 30, 2013 accounts receivable from one customer represented 13% of gross accounts receivable. As of December 31, 2012 accounts receivable from two customers represented approximately 18% and 11% of gross accounts receivable, respectively.

The components of accounts receivable are as follows:

	As of
	June 30, 2013			December 31, 2012
	(In thousands)
Trade receivables	$	40,434		$	39,921
Allowance for doubtful accounts	(6,784		)	(6,627		)
Total accounts receivable	$	33,650		$	33,294

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Capital Lease Obligation

6 Months Ended

Jun. 30, 2013

Capital Lease Obligation [Abstract]

Capital Leased Assets

Capital Lease Obligation

In June 2013 the Company acquired approximately $4.3 million of manufacturing equipment under a capital lease. The obligation under the capital lease will be repaid in equal monthly installments over the 36 month term of the lease and includes principal and interest payments with an effective interest rate of 17% . The underlying assets have been recorded at their fair value of $4.3 million and included in equipment on the Company's balance sheet as of June 30, 2013. The assets acquired under capital leases are being amortized on a straight-line basis over 5 years in accordance with the Company's policy for depreciation of manufacturing equipment. Amortization expense on assets acquired under capital leases is included with depreciation expense.

The aggregate future minimum lease payments related to these capital leases as of June 30, 2013, are as follows (in thousands):

Year Ending December 31,	Minimum Lease Payments
2013 (remaining)	906
2014	1,812
2015	1,812
2016	906
Total	$	5,436

There was no interest expense recorded on the capital lease in the three and six months ended June 30, 2013.

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Other Intangible Assets - Narrative (Detail) (USD $)	1 Months Ended	3 Months Ended		6 Months Ended			12 Months Ended						6 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2013 Scenario, Forecast	Jun. 30, 2013 Customer relationships	Dec. 31, 2012 Customer relationships	Jun. 30, 2013 Tradename	Dec. 31, 2012 Tradename	Jun. 30, 2013 Neighborhood Diabetes Customer relationships	Jun. 30, 2013 Neighborhood Diabetes Customer relationships Maximum	Jun. 30, 2013 Neighborhood Diabetes Tradename	Jun. 30, 2013 Neighborhood Diabetes Tradename Maximum
Acquired Finite-Lived Intangible Assets [Line Items]
Other intangible assets cost	$ 32,900,000
Estimated useful life													10 years		15 years
Finite-Lived Intangible Assets, Accumulated Amortization		12,633,000		12,633,000		9,937,000		12,200,000	9,600,000	400,000	300,000
Amortization of other intangible assets		1,300,000	1,500,000	2,700,000	3,200,000		4,900,000
Intangible asset, weighted average amortization period				9 years
Intangible assets		20,267,000		20,267,000		22,963,000						17,900,000		2,400,000
Impairment of Intangible Assets, Finite-lived				$ 0

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Equity (Tables)

6 Months Ended

Jun. 30, 2013

Stock Option Activity

The following summarizes the activity under the Company’s stock option plans:

	Number of Options (#)		Weighted Average Exercise Price ($)		Aggregate Intrinsic Value ($)
					(In thousands)
Balance, December 31, 2012	2,502,190		$	13.51
Granted	240,400		24.55
Exercised	(411,698	)	10.85		$	6,568	(1	)
Canceled	(47,838	)	19.55
Balance, June 30, 2013	2,283,054		$	15.02	$	37,410
Vested, June 30, 2013	1,385,193		$	11.91	$	27,006	(2	)
Vested and expected to vest, June 30, 2013 (3)	1,957,919				$	33,474	(2	)

(1) The aggregate intrinsic value was calculated based on the positive difference between the fair market value of the Company’s common stock as of the date of exercise and the exercise price of the underlying options.

(2) The aggregate intrinsic value was calculated based on the positive difference between the fair market value of the Company’s common stock as of June 30, 2013 and the exercise price of the underlying options.

(3) Represents the number of vested options as of June 30, 2013, plus the number of unvested options expected to vest as of June 30, 2013, based on the unvested options outstanding as of June 30, 2013, adjusted for the estimated forfeiture rate of 16%.

Summary of Restricted Stock Units

The following table summarizes the status of the Company’s restricted stock units:

	Number of Shares (#)		Weighted Average Fair Value ($)
Balance, December 31, 2012	825,068		$	18.40
Granted	563,475		23.92
Vested	(288,824	)	17.49
Forfeited	(41,687	)	19.88
Balance, June 30, 2013	1,058,032		$	21.53

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Debt - Outstanding Convertible Debt and Related Deferred Financing Costs (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2011	Jun. 30, 2008
Debt Instrument [Line Items]
Unamortized discount	$ (35,080)	$ (40,591)
Total debt	108,670	118,159
Current portion of long-term debt	0	14,429
Long-term debt	108,670	103,730
Deferred financing costs	1,707	2,004
5.375% Convertible Notes
Debt Instrument [Line Items]
Principal amount of Senior Notes	0	15,000		85,000
Unamortized discount			(10,500)	(26,900)
3.75% Convertible Notes
Debt Instrument [Line Items]
Principal amount of Senior Notes	$ 143,750	$ 143,750	$ 143,800

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Accounts Receivable - Components of Accounts Receivable (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Receivables [Abstract]
Trade receivables	$ 40,434	$ 39,921
Allowance for doubtful accounts	(6,784)	(6,627)
Accounts receivable, net	$ 33,650	$ 33,294

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Income Taxes - Narrative (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Deferred tax assets		$ 500,000	$ 500,000
Deferred tax liabilities		700,000	700,000
Unrecognized Tax Benefits		100,000	100,000
Uncertain Tax Positions	$ 100,000

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Equity - Stock Options Narrative (Details) (USD $)	3 Months Ended		6 Months Ended					3 Months Ended		6 Months Ended		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jan. 31, 2012	May 31, 2007	Jun. 30, 2013 Employee Stock Purchase Plans	Jun. 30, 2012 Employee Stock Purchase Plans	Jun. 30, 2013 Employee Stock Purchase Plans	Jun. 30, 2012 Employee Stock Purchase Plans	May 31, 2012 Stock Options and Restricted Stock Units	Jun. 30, 2013 Employee Stock Option	Jun. 30, 2012 Employee Stock Option	Jun. 30, 2013 Employee Stock Option	Jun. 30, 2012 Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding, shares	2,283,054		2,283,054		2,502,190
Options outstanding, weighted average exercise price	$ 15.02		$ 15.02		$ 13.51
Options outstanding, weighted average remaining contractual life			6 years 9 months 50 days
Options exercisable, shares	1,385,193		1,385,193
Options exercisable, weighted average exercise price	$ 11.91		$ 11.91
Options exercisable, weighted average remaining contractual life			5 years 8 months 15 days
Stock-based compensation expense	$ 3,800,000	$ 2,500,000	$ 6,800,000	$ 5,100,000				$ 0	$ 0	$ 0	$ 0		$ 1,300,000	$ 1,300,000	$ 2,500,000	$ 2,500,000
Total unrecognized compensation expense	$ 30,100,000		$ 30,100,000										$ 9,500,000		$ 9,500,000
Shares reserved for issuance under the plan							535,000
Maximum annual increase in shares of common stock reserved for issuance on January 1, 2012						725,000
Total unrecognized compensation expense weighted-average period															1 year 3 months 18 days
Number Of Additional Shares Available For Grant												3,775,000

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Product Warranty Costs - Product Warranty Liability (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011
Composition of balance:
Short-term	$ 934		$ 863
Long-term	1,467		1,129
Total warranty balance	$ 2,401	$ 2,249	$ 1,992	$ 1,822	$ 2,033	$ 1,960

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Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Preferred stock, par value (in USD per share)	$ 0.001	$ 0.001
Preferred stock, authorized	5,000,000	5,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value (in USD per share)	$ 0.001	$ 0.001
Common stock, authorized	100,000,000	100,000,000
Common stock, issued	54,329,612	48,359,063
Common stock, outstanding	54,329,612	48,359,063

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Goodwill

6 Months Ended

Jun. 30, 2013

Disclosure Goodwill Additional Information [Abstract]

Goodwill

Goodwill

The Company follows the provisions of FASB ASC Topic 350-20, Intangibles – Goodwill and Other (“ASC 350-20”). ASC 350-20 requires companies to use the purchase method of accounting for all business combinations initiated after June 30, 2001, and establishes specific criteria for the recognition of intangible assets separately from goodwill. Goodwill and indefinite-lived assets are tested for impairment at least annually. In accordance with ASC 350-20, the Company tests goodwill for impairment on an annual basis or whenever events and circumstances indicate there might be an impairment. The Company’s goodwill arose in connection with the acquisition of Neighborhood Diabetes in June 2011. No goodwill impairment was recorded in the six months ended June 30, 2013.

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities
Net loss	$ (21,184)	$ (29,256)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities
Depreciation and amortization	5,763	5,498
Non-cash interest and other expense	6,133	4,988
Stock-based compensation expense	6,844	5,155
Provision for bad debts	2,568	1,486
Changes in operating assets and liabilities:
Accounts receivable	(2,924)	(3,887)
Inventories	8,888	(4,588)
Deferred revenue	(4,545)	(1,434)
Prepaid expenses and other assets	(2,055)	(725)
Accounts payable, accrued expenses and other current liabilities	3,305	2,730
Other long-term liabilities	379	16
Net cash provided by (used in) operating activities	3,172	(20,017)
Cash flows from investing activities
Purchases of property and equipment	(2,695)	(4,249)
Net cash used in investing activities	(2,695)	(4,249)
Cash flows from financing activities
Repayments of Debt	(2,000)	0
Net proceeds from issuance of common stock	97,605	1,642
Payment of withholding taxes in connection with vesting of restricted stock units	(2,431)	(1,187)
Net cash provided by financing activities	93,174	455
Net increase (decrease) in cash and cash equivalents	93,651	(23,811)
Cash and cash equivalents, beginning of period	57,293	93,955
Cash and cash equivalents, end of period	150,944	70,144
Purchases of property and equipment under capital lease	4,284	0
Common Stock issued in exchange for 5.375% Convertible Senior Notes	$ 13,000	$ 0

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 150,944	$ 57,293
Accounts receivable, net	33,650	33,294
Inventories	5,979	14,867
Prepaid expenses and other current assets	6,556	4,482
Total current assets	197,129	109,936
Property and equipment, net	29,334	25,422
Intangible assets, net	20,267	22,963
Goodwill	37,536	37,536
Other assets	1,886	2,202
Total assets	286,152	198,059
Current Liabilities
Accounts payable	11,441	9,361
Accrued expenses and other current liabilities	20,276	19,051
Deferred revenue	900	5,445
Capital Lease Obligations, Current	1,236	0
Current portion of long-term debt	0	14,429
Total current liabilities	33,853	48,286
Capital Lease Obligations, Noncurrent	3,048	0
Long-term debt	108,670	103,730
Other long-term liabilities	2,246	1,867
Total liabilities	147,817	153,883
Commitments and Contingencies (Note 11)
Stockholders’ Equity
Preferred stock, $.001 par value: Authorized: 5,000,000 shares at June 30, 2013 and December 31, 2012 Issued and outstanding: zero shares at June 30, 2013 and December 31, 2012	0	0
Common stock, $.001 par value: Authorized: 100,000,000 shares at June 30, 2013 and December 31, 2012. Issued and outstanding: 54,329,612 and 48,359,063 shares at June 30, 2013 and December 31, 2012, respectively	54	48
Additional paid-in capital	641,016	525,679
Accumulated deficit	(502,735)	(481,551)
Total stockholders’ equity	138,335	44,176
Total liabilities and stockholders’ equity	$ 286,152	$ 198,059

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Equity - Employee Stock Purchase Plan Narrative (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,800,000	$ 2,500,000	$ 6,800,000	$ 5,100,000
Employee Stock Purchase Plans
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	0	0	0	0
Shares contingently issued under employee stock purchase plan	6,390	8,882
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,300,000	$ 1,300,000	$ 2,500,000	$ 2,500,000

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Income Taxes (Tables)

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Tax expense

Income tax expense consists of the following (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Current	$	88	$	43	$	191	$	63
Deferred	30		26		58		52
Total	$	118	$	69	$	249	$	115

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Accounts Receivable (Tables)

6 Months Ended

Jun. 30, 2013

Receivables [Abstract]

Components of Accounts Receivable

The components of accounts receivable are as follows:

	As of
	June 30, 2013			December 31, 2012
	(In thousands)
Trade receivables	$	40,434		$	39,921
Allowance for doubtful accounts	(6,784		)	(6,627		)
Total accounts receivable	$	33,650		$	33,294

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Product Warranty Costs - Reconciliation of Changes in Product Warranty Liability (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at the beginning of the period	$ 2,249	$ 2,033	$ 1,992	$ 1,960
Warranty expense	785	348	1,661	1,222
Warranty claims settled	(633)	(559)	(1,252)	(1,360)
Balance at the end of the period	$ 2,401	$ 1,822	$ 2,401	$ 1,822

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Income Taxes - Income Tax Benefit (Expense) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Tax Expenses [Line Items]
Current	$ 88	$ 43	$ 191	$ 63
Deferred	30	26	58	52
Total	$ 118	$ 69	$ 249	$ 115

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Inventories - Components of Inventories (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Inventory [Line Items]
Raw materials	$ 1,422	$ 1,487
Work-in-process	365	1,595
Finished goods	4,192	11,785
Inventories	$ 5,979	$ 14,867

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Capital Lease Obligation (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Capital Lease Obligation [Abstract]
Interest expense on capital lease obiligation	$ 0	$ 0
2013 (remaining)	906,000	906,000
2014	1,812,000	1,812,000
2015	1,812,000	1,812,000
2016	906,000	906,000
Total	5,436,000	5,436,000
Capital Lease Term		36 months
Capital Lease Effective Interest Rate		17.00%
Fair Value of Assets Acquired		$ 4,300,000
Property, Plant and Equipment, Useful Life		5 years

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Net Loss Per Share - Potential Common Shares Excluded from Computation of Diluted Net Loss Per Share (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	9,594,181	9,968,494	9,594,181	9,968,494
5.375% Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	702,701	702,701	702,701	702,701
3.75% Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	5,487,642	5,487,642	5,487,642	5,487,642
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	1,058,032	860,319	1,058,032	860,319
Outstanding options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	2,283,054	2,855,080	2,283,054	2,855,080
Outstanding warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount	62,752	62,752	62,752	62,752

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Other Intangible Assets

6 Months Ended

Jun. 30, 2013

Disclosure Components Of Other Intangible Assets [Abstract]

Other Intangible Assets

Other Intangible Assets

Other intangible assets consist of the following:

	As of
	June 30, 2013			December 31, 2012
	(In thousands)
Customer relationships	$	30,100		$	30,100
Tradename	2,800			2,800
Total intangible assets	32,900			32,900
Less: accumulated amortization	(12,633		)	(9,937		)
Total	$	20,267		$	22,963

The Company recorded $32.9 million of other intangible assets in the year ended December 31, 2011 as a result of the acquisition of Neighborhood Diabetes. The Company determined that the estimated useful life of the customer relationships asset is 10 years and is amortizing the asset over that period using an estimated cash flow pattern. The Company determined that the useful life of the Neighborhood Diabetes tradename is 15 years and is amortizing the asset over that period on a straight-line basis. Accumulated amortization on the customer relationship asset was $12.2 million and $9.6 million as of June 30, 2013 and December 31, 2012, respectively. Accumulated amortization on the tradename asset was $0.4 million and $0.3 million as of June 30, 2013 and December 31, 2012, respectively. Amortization expense was approximately $1.3 million and $1.5 million for the three months ended June 30, 2013 and 2012, respectively. Amortization expense was approximately $2.7 million and $3.2 million for the six months ended June 30, 2013 and 2012, respectively. Amortization expense for the year ending December 31, 2013 is expected to be approximately $4.9 million. As of June 30, 2013, the weighted average amortization period of the Company’s intangible assets is approximately 9 years.

In April 2013, the Company was notified that Neighborhood Diabetes was not offered a contract under the Center for Medicare & Medicaid Services ("CMS") national mail-order competition of the Medicare Durable Medical Equipment, Prosthetics, Orthotics, and Supplies ("DMEPOS") Competitive Bidding Program. As of July 1, 2013, the program implementation date, the Company is no longer eligible to provide certain mail-order diabetic testing supplies such as blood glucose testing strips and lancets to Medicare beneficiaries. The Company performed an analysis of the future undiscounted cash flows of its customer relationship and tradename assets and determined that the carrying value of the assets is recoverable. No impairment of these intangible assets was recorded in the six months ended June 30, 2013.

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Nature of the Business Nature of Business (Details)	Jun. 30, 2013 in
Nature of Business [Line Items]
Number of Inches of Tubing in conventional insulin pump	42

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Goodwill - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2013
Goodwill [Line Items]
Goodwill impairment loss	$ 0

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2013

Disclosure Commitments And Contingencies Additional Information [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Operating Leases

The Company leases its facilities in Massachusetts, New York, Florida, and Singapore. The Company’s leases are accounted for as operating leases. The leases generally provide for a base rent plus real estate taxes and certain operating expenses related to the leases. The Company has extended the leases of its facilities in Bedford and Billerica, Massachusetts. Following the extensions, these leases expire in September 2014. The leases for Bedford contain a five-year renewal option and escalating payments over the life of the lease.

During the year ended December 31, 2012, the Company terminated a lease for one of its corporate office spaces in Bedford, Massachusetts. The lease termination resulted in no material impact to the financial statements. During the same period, the Company entered into a new lease agreement for an additional 26,500 square feet in Bedford, Massachusetts. This lease expires in September 2014 and includes escalating payments over its term. During the six months ended June 30, 2013, the Company extended the lease of its Woburn location. Following the extension, the lease expires in December 2014. The leases in Singapore, Florida, and New York expire in July 2013, December 2013, and April 2015, respectively.

Certain of the Company’s operating lease agreements contain scheduled rent increases, which are being amortized over the terms of the agreements using the straight-line method and are included in other liabilities in the accompanying consolidated balance sheet. The aggregate future minimum lease payments related to these leases as of June 30, 2013, are as follows (in thousands):

Year Ending December 31,	Minimum Lease Payments
2013 (remaining)	690
2014	1,046
2015	45
Total	$	1,781

Legal Proceedings

In August 2010, Becton, Dickinson and Company (“BD”), filed a lawsuit in the United States District Court in the State of New Jersey against the Company alleging that the OmniPod System infringes three of its patents. BD seeks a declaration that the Company has infringed its patents, equitable relief, including an injunction that would enjoin the Company from infringing these patents and an unspecified award for monetary damages. The Company believes that the OmniPod System does not infringe these patents. The Company expects that this litigation will not have a material adverse impact on its financial position or results of operations. The Company believes it has meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the ultimate outcome or effect of this action. The Company does not believe it has any material financial exposure with regard to this action at June 30, 2013.

In a letter received in March 2007, Medtronic, Inc. invited the Company to discuss its “taking a license to certain Medtronic patents.” In October 2012, Medtronic MiniMed Inc., Medtronic Puerto Rico Operations Co. and MiniMed Distribution Corp. (collectively, “Medtronic”) filed a lawsuit in United States District Court for the Central District of California alleging that the Company infringes the two patents referenced in their 2007 letter which are owned by Medtronic MiniMed Inc. and licensed to Medtronic Puerto Rico Operations Co. and MiniMed Distribution Corp. Medtronic seeks a declaration that the Company has infringed its patents, equitable relief, including an injunction that would enjoin the Company from infringing these patents and an unspecified award for monetary damages. The patents referenced by this lawsuit relate to technology that is material to the Company’s business. The Company believes that the OmniPod System does not infringe these patents. The Company believes it has meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the ultimate outcome or effect of this action. The Company does not believe it has any material financial exposure with regard to this action at June 30, 2013.

In April 2013, Rydex Technologies LLC (“Rydex”), a non-practicing entity, filed a lawsuit in the United States District Court in the State of Delaware against the Company alleging that certain of its products, including the OmniPod System, infringe one of its patents. Rydex seeks a declaration that the Company has infringed its patent and an unspecified award for monetary damages. The Company believes that the OmniPod System does not infringe this patent. The Company expects that this litigation will not have a material adverse impact on its financial position or results of operations. The Company believes it has meritorious defenses to this lawsuit; however, litigation is inherently uncertain and there can be no assurance as to the ultimate outcome or effect of this action. The Company does not believe it has any material financial exposure with regard to this action at June 30, 2013.

Indemnifications

In the normal course of business, the Company enters into contracts and agreements that contain a variety of representations and warranties and provide for general indemnifications. The Company’s exposure under these agreements is unknown because it involves claims that may be made against the Company in the future, but have not yet been made. To date, the Company has not paid any claims or been required to defend any action related to its indemnification obligations. However, the Company may record charges in the future as a result of these indemnification obligations.

In accordance with its bylaws, the Company has indemnification obligations to its officers and directors for certain events or occurrences, subject to certain limits, while they are serving at the Company’s request in such capacity. There have been no claims to date, and the Company has a director and officer insurance policy that enables it to recover a portion of any amounts paid for future claims.

At June 30, 2013, the Company is subject to an on-going sales and use tax audit by the Massachusetts Department of Revenue related to Neighborhood Diabetes for a period prior to the acquisition. Under the Merger Agreement, the Company has been indemnified by the former Stockholders of Neighborhood Diabetes for any liability resulting from or related to any tax attributable to pre-acquisition periods. The Company has recorded a contingent liability in current liabilities and a corresponding indemnification asset in current assets related to the estimated sales tax payable to the state of Massachusetts for the period under audit.

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Inventories

6 Months Ended

Jun. 30, 2013

Disclosure Components Of Inventories [Abstract]

Inventories

Inventories

Inventories consist of the following:

	As of
	June 30, 2013		December 31, 2012
	(In thousands)
Raw materials	$	1,422	$	1,487
Work-in-process	365		1,595
Finished goods	4,192		11,785
Total inventories	$	5,979	$	14,867

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q have been prepared in accordance with generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these unaudited consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring adjustments, considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2013, are not necessarily indicative of the results that may be expected for the full year ending December 31, 2013, or for any other subsequent interim period.

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.

Use of Estimates in Preparation of Financial Statements

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting periods. The most significant estimates used in these financial statements include the valuation of stock-based compensation expense, accounts receivable, inventories, goodwill, deferred revenue and equity instruments, the lives of property and equipment and intangible assets, as well as warranty and doubtful accounts allowance reserve calculations. Actual results may differ from those estimates.

Principles of Consolidation

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q include the accounts of the Company and its wholly-owned subsidiaries. All material intercompany balances and transactions have been eliminated in consolidation.

Fair Value Measurements

The Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 820, Fair Value Measurements and Disclosures (“ASC 820”) related to the fair value measurement of certain of its assets and liabilities. ASC 820 defines fair value as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. FASB ASC 820 also describes three levels of inputs that may be used to measure the fair value:

Level 1 — quoted prices in active markets for identical assets or liabilities

Level 2 — observable inputs other than quoted prices in active markets for identical assets or liabilities

Level 3 — unobservable inputs in which there is little or no market data available, which require the reporting entity to develop its own assumptions

The only assets and liabilities subject to fair value measurement standards at June 30, 2013 and December 31, 2012 are cash equivalents, including money market accounts, and long-term obligations which are based on Level 1 inputs.

Certain of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other liabilities are carried at cost, which approximates their fair value because of the short-term maturity of these financial instruments. Based on the borrowing rates currently available to the Company for loans with similar terms, the carrying value of the Company’s long-term debt and capital lease obligations approximates their fair values.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable consist of amounts due from third-party payors, patients, third-party distributors, and government agencies. The allowance for doubtful accounts is recorded at the time collection risk is identified. The Company estimates its allowance based on historical experience, assessment of specific risk, discussions with individual customers and various assumptions and estimates that are believed to be reasonable under the circumstances.

Inventories

Inventories are held at the lower of cost or market, determined under the first-in, first-out method. Inventory has been recorded at cost as of June 30, 2013 and December 31, 2012. Work in process is calculated based upon a build up in the stage of completion using estimated labor inputs for each stage in production. The Company periodically reviews inventories for potential impairment based on quantities on hand and expectations of future use.

Property and Equipment

Property and equipment is stated at cost and depreciated using the straight-line method over the estimated useful life of the respective assets. Leasehold improvements are amortized over their useful life or the life of the lease, whichever is shorter. Assets acquired under capital leases are amortized in accordance with the respective class of owned assets or life of the lease and the amortization is included with depreciation expense. Maintenance and repair costs are expensed as incurred.

Intangibles and Other Long-Lived Assets

The Company’s finite-lived intangible assets are stated at cost less accumulated amortization. The Company assesses its intangible and other long-lived assets for impairment whenever events or changes in circumstances suggest that the carrying value of an asset may not be recoverable. The Company recognizes an impairment loss for intangibles and other long-lived assets if the carrying amount of the asset is not recoverable based on its undiscounted future cash flows. Any such impairment loss is measured as the difference between the carrying amount and the fair value of the asset. The estimation of useful lives and expected cash flows requires the Company to make significant judgments regarding future periods that are subject to some factors outside its control. Changes in these estimates can result in significant revisions to the carrying value of these assets and may result in material charges to the results of operations. The estimated life of the acquired tradename asset is 15 years. The estimated life of the acquired customer relationship asset is 10 years. Intangible assets with determinable estimated lives are amortized over these lives. At June 30, 2013, intangible assets consisted of $17.9 million of customer relationships and $2.4 million of tradenames.

Goodwill

Goodwill represents the excess of the cost of the acquired Neighborhood Diabetes businesses over the fair value of identifiable net assets acquired. The Company performs an assessment of its goodwill for impairment on at least an annual basis or whenever events or changes in circumstances indicate there might be impairment.

Goodwill is evaluated at the reporting unit level. To test for impairment, the Company compares the carrying value of the reporting unit to its fair value using a discounted cash flow analysis. If the reporting unit’s carrying value exceeds its fair value, the Company would record an impairment loss to the extent that the carrying value of goodwill exceeds its implied fair value.

Warranty

The Company provides a four-year warranty on its PDMs and may replace any OmniPods that do not function in accordance with product specifications. The Company estimates its warranty reserves at the time the product is shipped based on historical experience and the estimated cost to service the claims. Cost to service the claims reflects the current product cost, which has been decreasing over time. As these estimates are based on historical experience, and the Company continues to introduce new versions of existing products, the Company also considers the anticipated performance of the product over its warranty period in estimating warranty reserves.

Revenue Recognition

The Company generates nearly all of its revenue from sales of its OmniPod System and other diabetes related products including blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals to customers and third-party distributors who resell the products to patients with diabetes.

Revenue recognition requires that persuasive evidence of a sales arrangement exists, delivery of goods occurs through transfer of title and risk and rewards of ownership, the selling price is fixed or determinable and collectability is reasonably assured. With respect to these criteria:

• The evidence of an arrangement generally consists of a physician order form, a patient information form and, if applicable, third-party insurance approval for sales directly to patients or a purchase order for sales to a third-party distributor.

• Transfer of title and risk and rewards of ownership are passed to the patient or third-party distributor upon shipment of the products.

• The selling prices for all sales are fixed and agreed with the patient or third-party distributor and, if applicable, the patient’s third-party insurance provider(s), prior to shipment and are based on established list prices or, in the case of certain third-party insurers, contractually agreed upon prices. Provisions for discounts and rebates to customers are established as a reduction to revenue in the same period the related sales are recorded.

The Company offers a 45-day right of return for its OmniPod System sales to new patients, and defers revenue to reflect estimated sales returns in the same period that the related product sales are recorded. Returns are estimated through a comparison of the Company’s historical return data to their related sales. Historical rates of return are adjusted for known or expected changes in the marketplace when appropriate. When doubt exists about reasonable assuredness of collectability from specific customers, the Company defers revenue from sales of products to those customers until payment is received.

In June 2011, the Company entered into a development agreement with a U.S. based pharmaceutical company (the “Development Agreement”). Under the Development Agreement, the Company is required to perform design, development, regulatory and other services to support the pharmaceutical company as it works to obtain regulatory approval to use the Company’s drug delivery technology as a delivery method for its pharmaceutical. Over the term of the Development Agreement, the Company has and will continue to invoice amounts based upon meeting certain deliverable milestones. Revenue from the Development Agreement is recognized using a proportional performance methodology based on efforts incurred and total payments under the agreement. The impact of changes in the expected total effort or contract payments are recognized as a change in estimate using the cumulative catch-up method.

The Company deferred revenue of $0.9 million and $5.4 million as of June 30, 2013 and December 31, 2012, respectively. The deferred revenue recorded was comprised of product-related revenue and unrecognized amounts related to the Development Agreement.

Concentration of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents. The Company maintains the majority of its cash with two accredited financial institutions.

The Company purchases complete OmniPods from Flextronics International Ltd., its single source supplier. As of June 30, 2013 and December 31, 2012, liabilities to one vendor represented approximately 29% and 19% of the combined balance of accounts payable and accrued expenses, and other current liabilities, respectively.

Segment Reporting

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated on a regular basis by the chief operating decision-maker, or decision-making group, in deciding how to allocate resources to an individual segment and in assessing performance of the segment. The Company’s current product offering consists of diabetes supplies, including the OmniPod System as well as other diabetes related products and supplies such as blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals. The Company’s current product offering is marketed to a single customer type, people with diabetes. As the Company sells a single product type, management operates the business as a single entity.

Income Taxes

Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates that will be in effect in the years in which the differences are expected to reverse. A valuation allowance is required to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company reviews its deferred tax assets for recoverability considering historical profitability, projected future taxable income, and the expected timing of the reversals of existing temporary differences and tax planning strategies.

The Company follows the provisions of FASB ASC 740-10, Income Taxes (“ASC 740-10”) on the accounting for uncertainty in income taxes recognized in its financial statements. ASC 740-10 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. In addition, ASC 740-10 provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, and disclosure and transition. The Company recognizes estimated interest and penalties for uncertain tax positions in income tax expense. As of June 30, 2013 interest and penalties were immaterial to the consolidated financial statements.

The Company files federal, state and foreign tax returns. These returns are generally open to examination by the relevant tax authorities from three to four years from the date they are filed. The tax filings relating to the Company's federal and state returns are currently open to examination for tax years 2009 through 2011 and 2008 through 2011, respectively. In addition, the Company has generated tax losses since its inception in 2000. These years may be subject to examination if the losses are carried forward and utilized in future years.

Stock-Based Compensation

The Company accounts for stock-based compensation under the provisions of FASB ASC 718-10, Compensation — Stock Compensation (“ASC 718-10”), which requires all share-based payments to employees, including grants of employee stock options, to be recognized in the income statement based on their fair values. Share-based payments that contain performance conditions are recognized when such conditions are probable of being achieved.

The Company uses the Black-Scholes option pricing model to determine the weighted average fair value of options granted. The Company determines the intrinsic value of restricted stock units based on the closing price of its common stock on the date of grant. The Company recognizes the compensation expense of share-based awards on a straight-line basis for awards with only service conditions and accelerated method for performance conditions over the respective vesting periods of the awards.

The determination of the fair value of share-based payment awards utilizing the Black-Scholes model is affected by the stock price and a number of assumptions, including expected volatility, expected life, risk-free interest rate and expected dividends. The expected life of the awards is estimated based on the midpoint between the vesting date and the end of the contractual term. The risk-free interest rate assumption is based on observed interest rates appropriate for the terms of the awards. The dividend yield assumption is based on company history and expectation of paying no dividends. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Stock-based compensation expense recognized in the financial statements is based on awards that are ultimately expected to vest. The Company evaluates the assumptions used to value the awards on a quarterly basis and, if factors change and different assumptions are utilized, stock-based compensation expense may differ significantly from what has been recorded in the past. If there are any modifications or cancellations of the underlying unvested securities, the Company may be required to accelerate, increase or cancel any remaining unearned stock-based compensation expense.

See Footnote 12 for a summary of the stock activity under the Company’s stock-based employee compensation plan.

Recent Accounting Pronouncements

In July 2012, the FASB issued ASU No. 2012-2 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU No. 2012-2”). ASU No. 2012-2 gives a company the option to first assess qualitative factors to determine whether it is more-likely-than-not that the indefinite-lived intangible is impaired. Qualitative factors include related events and circumstances that could affect the significant inputs used in determining the fair value of the indefinite-lived intangible asset. The guidance is effective in fiscal years beginning after September 15, 2012. The Company adopted the guidance in the first quarter of 2013. The adoption of the guidance did not have a material impact on the Company's financial statements.

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Equity - Restricted Stock Units Narrative (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3,800,000	$ 2,500,000	$ 6,800,000	$ 5,100,000
Total unrecognized compensation expense	30,100,000		30,100,000
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the period			563,475
Other than options - granted in period, weighted average fair value			$ 23.92
Other than options - grant date fair value			13,500,000
Stock-based compensation expense	2,500,000	1,300,000	4,300,000	2,700,000
Total unrecognized compensation expense	20,600,000		20,600,000
Total unrecognized compensation expense weighted-average period			1 year 8 months 15 days
Restricted Stock Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Restricted Stock Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted during the period			142,000
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	1,300,000	1,300,000	2,500,000	2,500,000
Total unrecognized compensation expense	$ 9,500,000		$ 9,500,000
Total unrecognized compensation expense weighted-average period			1 year 3 months 18 days

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Commitments and Contingencies - Aggregate Future Minimum Lease Payments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Minimum Lease Payments
2013 (remaining)	$ 690
2014	1,046
2015	45
Total	$ 1,781

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Debt - Interest Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Debt Instrument [Line Items]
Contractual coupon interest	$ 1,460	$ 1,549	$ 3,009	$ 3,098
Accretion of debt discount	2,751	2,387	5,511	4,691
Loss on debt extinguishment	325	0	325	0
Amortization of debt issuance costs	149	149	297	297
Total interest and other expense	$ 4,685	$ 4,085	$ 9,142	$ 8,086

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2013

Basis of Presentation

Basis of Presentation

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q have been prepared in accordance with generally accepted accounting principles (“GAAP”) for interim financial information and the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these unaudited consolidated financial statements do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring adjustments, considered necessary for a fair presentation have been included. Operating results for the three and six month periods ended June 30, 2013, are not necessarily indicative of the results that may be expected for the full year ending December 31, 2013, or for any other subsequent interim period.

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q should be read in conjunction with the Company’s consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012.

Use of Estimates in Preparation of Financial Statements

Use of Estimates in Preparation of Financial Statements

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenue and expense during the reporting periods. The most significant estimates used in these financial statements include the valuation of stock-based compensation expense, accounts receivable, inventories, goodwill, deferred revenue and equity instruments, the lives of property and equipment and intangible assets, as well as warranty and doubtful accounts allowance reserve calculations. Actual results may differ from those estimates.

Principles of Consolidation

Principles of Consolidation

The unaudited consolidated financial statements in this Quarterly Report on Form 10-Q include the accounts of the Company and its wholly-owned subsidiaries. All material intercompany balances and transactions have been eliminated in consolidation.

Fair Value of Financial Instruments

Fair Value Measurements

The Company adopted the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 820, Fair Value Measurements and Disclosures (“ASC 820”) related to the fair value measurement of certain of its assets and liabilities. ASC 820 defines fair value as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. FASB ASC 820 also describes three levels of inputs that may be used to measure the fair value:

Level 1 — quoted prices in active markets for identical assets or liabilities

Level 2 — observable inputs other than quoted prices in active markets for identical assets or liabilities

Level 3 — unobservable inputs in which there is little or no market data available, which require the reporting entity to develop its own assumptions

The only assets and liabilities subject to fair value measurement standards at June 30, 2013 and December 31, 2012 are cash equivalents, including money market accounts, and long-term obligations which are based on Level 1 inputs.

Certain of the Company’s financial instruments, including cash and cash equivalents, accounts receivable, accounts payable, accrued expenses and other liabilities are carried at cost, which approximates their fair value because of the short-term maturity of these financial instruments. Based on the borrowing rates currently available to the Company for loans with similar terms, the carrying value of the Company’s long-term debt and capital lease obligations approximates their fair values.

Accounts Receivable and Allowance for Doubtful Accounts

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable consist of amounts due from third-party payors, patients, third-party distributors, and government agencies. The allowance for doubtful accounts is recorded at the time collection risk is identified. The Company estimates its allowance based on historical experience, assessment of specific risk, discussions with individual customers and various assumptions and estimates that are believed to be reasonable under the circumstances.

Inventories

Inventories

Inventories are held at the lower of cost or market, determined under the first-in, first-out method. Inventory has been recorded at cost as of June 30, 2013 and December 31, 2012. Work in process is calculated based upon a build up in the stage of completion using estimated labor inputs for each stage in production. The Company periodically reviews inventories for potential impairment based on quantities on hand and expectations of future use.

Property and Equipment

Property and Equipment

Property and equipment is stated at cost and depreciated using the straight-line method over the estimated useful life of the respective assets. Leasehold improvements are amortized over their useful life or the life of the lease, whichever is shorter. Assets acquired under capital leases are amortized in accordance with the respective class of owned assets or life of the lease and the amortization is included with depreciation expense. Maintenance and repair costs are expensed as incurred.

Intangibles and Other Long-Lived Assets

Intangibles and Other Long-Lived Assets

The Company’s finite-lived intangible assets are stated at cost less accumulated amortization. The Company assesses its intangible and other long-lived assets for impairment whenever events or changes in circumstances suggest that the carrying value of an asset may not be recoverable. The Company recognizes an impairment loss for intangibles and other long-lived assets if the carrying amount of the asset is not recoverable based on its undiscounted future cash flows. Any such impairment loss is measured as the difference between the carrying amount and the fair value of the asset. The estimation of useful lives and expected cash flows requires the Company to make significant judgments regarding future periods that are subject to some factors outside its control. Changes in these estimates can result in significant revisions to the carrying value of these assets and may result in material charges to the results of operations. The estimated life of the acquired tradename asset is 15 years. The estimated life of the acquired customer relationship asset is 10 years. Intangible assets with determinable estimated lives are amortized over these lives. At June 30, 2013, intangible assets consisted of $17.9 million of customer relationships and $2.4 million of tradenames.

Goodwill

Goodwill

Goodwill represents the excess of the cost of the acquired Neighborhood Diabetes businesses over the fair value of identifiable net assets acquired. The Company performs an assessment of its goodwill for impairment on at least an annual basis or whenever events or changes in circumstances indicate there might be impairment.

Goodwill is evaluated at the reporting unit level. To test for impairment, the Company compares the carrying value of the reporting unit to its fair value using a discounted cash flow analysis. If the reporting unit’s carrying value exceeds its fair value, the Company would record an impairment loss to the extent that the carrying value of goodwill exceeds its implied fair value.

Warranty

Warranty

The Company provides a four-year warranty on its PDMs and may replace any OmniPods that do not function in accordance with product specifications. The Company estimates its warranty reserves at the time the product is shipped based on historical experience and the estimated cost to service the claims. Cost to service the claims reflects the current product cost, which has been decreasing over time. As these estimates are based on historical experience, and the Company continues to introduce new versions of existing products, the Company also considers the anticipated performance of the product over its warranty period in estimating warranty reserves.

Revenue Recognition

Revenue Recognition

The Company generates nearly all of its revenue from sales of its OmniPod System and other diabetes related products including blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals to customers and third-party distributors who resell the products to patients with diabetes.

Revenue recognition requires that persuasive evidence of a sales arrangement exists, delivery of goods occurs through transfer of title and risk and rewards of ownership, the selling price is fixed or determinable and collectability is reasonably assured. With respect to these criteria:

• The evidence of an arrangement generally consists of a physician order form, a patient information form and, if applicable, third-party insurance approval for sales directly to patients or a purchase order for sales to a third-party distributor.

• Transfer of title and risk and rewards of ownership are passed to the patient or third-party distributor upon shipment of the products.

• The selling prices for all sales are fixed and agreed with the patient or third-party distributor and, if applicable, the patient’s third-party insurance provider(s), prior to shipment and are based on established list prices or, in the case of certain third-party insurers, contractually agreed upon prices. Provisions for discounts and rebates to customers are established as a reduction to revenue in the same period the related sales are recorded.

The Company offers a 45-day right of return for its OmniPod System sales to new patients, and defers revenue to reflect estimated sales returns in the same period that the related product sales are recorded. Returns are estimated through a comparison of the Company’s historical return data to their related sales. Historical rates of return are adjusted for known or expected changes in the marketplace when appropriate. When doubt exists about reasonable assuredness of collectability from specific customers, the Company defers revenue from sales of products to those customers until payment is received.

In June 2011, the Company entered into a development agreement with a U.S. based pharmaceutical company (the “Development Agreement”). Under the Development Agreement, the Company is required to perform design, development, regulatory and other services to support the pharmaceutical company as it works to obtain regulatory approval to use the Company’s drug delivery technology as a delivery method for its pharmaceutical. Over the term of the Development Agreement, the Company has and will continue to invoice amounts based upon meeting certain deliverable milestones. Revenue from the Development Agreement is recognized using a proportional performance methodology based on efforts incurred and total payments under the agreement. The impact of changes in the expected total effort or contract payments are recognized as a change in estimate using the cumulative catch-up method.

The Company deferred revenue of $0.9 million and $5.4 million as of June 30, 2013 and December 31, 2012, respectively. The deferred revenue recorded was comprised of product-related revenue and unrecognized amounts related to the Development Agreement.

Concentration of Credit Risk

Concentration of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents. The Company maintains the majority of its cash with two accredited financial institutions.

The Company purchases complete OmniPods from Flextronics International Ltd., its single source supplier. As of June 30, 2013 and December 31, 2012, liabilities to one vendor represented approximately 29% and 19% of the combined balance of accounts payable and accrued expenses, and other current liabilities, respectively.

Segment Reporting

Segment Reporting

Operating segments are defined as components of an enterprise about which separate financial information is available that is evaluated on a regular basis by the chief operating decision-maker, or decision-making group, in deciding how to allocate resources to an individual segment and in assessing performance of the segment. The Company’s current product offering consists of diabetes supplies, including the OmniPod System as well as other diabetes related products and supplies such as blood glucose testing supplies, traditional insulin pumps, pump supplies and pharmaceuticals. The Company’s current product offering is marketed to a single customer type, people with diabetes. As the Company sells a single product type, management operates the business as a single entity.

Income Taxes

Income Taxes

Deferred tax assets and liabilities are determined based on differences between the financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates that will be in effect in the years in which the differences are expected to reverse. A valuation allowance is required to reduce the deferred tax assets reported if, based on the weight of the evidence, it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Company reviews its deferred tax assets for recoverability considering historical profitability, projected future taxable income, and the expected timing of the reversals of existing temporary differences and tax planning strategies.

The Company follows the provisions of FASB ASC 740-10, Income Taxes (“ASC 740-10”) on the accounting for uncertainty in income taxes recognized in its financial statements. ASC 740-10 prescribes a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. In addition, ASC 740-10 provides guidance on derecognition, classification, interest and penalties, accounting in interim periods, and disclosure and transition. The Company recognizes estimated interest and penalties for uncertain tax positions in income tax expense. As of June 30, 2013 interest and penalties were immaterial to the consolidated financial statements.

The Company files federal, state and foreign tax returns. These returns are generally open to examination by the relevant tax authorities from three to four years from the date they are filed. The tax filings relating to the Company's federal and state returns are currently open to examination for tax years 2009 through 2011 and 2008 through 2011, respectively. In addition, the Company has generated tax losses since its inception in 2000. These years may be subject to examination if the losses are carried forward and utilized in future years.

Stock Based Compensation

Stock-Based Compensation

The Company accounts for stock-based compensation under the provisions of FASB ASC 718-10, Compensation — Stock Compensation (“ASC 718-10”), which requires all share-based payments to employees, including grants of employee stock options, to be recognized in the income statement based on their fair values. Share-based payments that contain performance conditions are recognized when such conditions are probable of being achieved.

The Company uses the Black-Scholes option pricing model to determine the weighted average fair value of options granted. The Company determines the intrinsic value of restricted stock units based on the closing price of its common stock on the date of grant. The Company recognizes the compensation expense of share-based awards on a straight-line basis for awards with only service conditions and accelerated method for performance conditions over the respective vesting periods of the awards.

The determination of the fair value of share-based payment awards utilizing the Black-Scholes model is affected by the stock price and a number of assumptions, including expected volatility, expected life, risk-free interest rate and expected dividends. The expected life of the awards is estimated based on the midpoint between the vesting date and the end of the contractual term. The risk-free interest rate assumption is based on observed interest rates appropriate for the terms of the awards. The dividend yield assumption is based on company history and expectation of paying no dividends. Forfeitures are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. Stock-based compensation expense recognized in the financial statements is based on awards that are ultimately expected to vest. The Company evaluates the assumptions used to value the awards on a quarterly basis and, if factors change and different assumptions are utilized, stock-based compensation expense may differ significantly from what has been recorded in the past. If there are any modifications or cancellations of the underlying unvested securities, the Company may be required to accelerate, increase or cancel any remaining unearned stock-based compensation expense.

See Footnote 12 for a summary of the stock activity under the Company’s stock-based employee compensation plan.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In July 2012, the FASB issued ASU No. 2012-2 Intangibles – Goodwill and Other (Topic 350): Testing Indefinite-Lived Intangible Assets for Impairment (“ASU No. 2012-2”). ASU No. 2012-2 gives a company the option to first assess qualitative factors to determine whether it is more-likely-than-not that the indefinite-lived intangible is impaired. Qualitative factors include related events and circumstances that could affect the significant inputs used in determining the fair value of the indefinite-lived intangible asset. The guidance is effective in fiscal years beginning after September 15, 2012. The Company adopted the guidance in the first quarter of 2013. The adoption of the guidance did not have a material impact on the Company's financial statements.

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Product Warranty Costs

6 Months Ended

Jun. 30, 2013

Disclosure Product Warranty Liability [Abstract]

Product Warranty Costs

Product Warranty Costs

The Company provides a four-year warranty on its PDMs and may replace any OmniPods that do not function in accordance with product specifications. Warranty expense is estimated and recorded in the period that shipment occurs. The expense is based on the Company’s historical experience and the estimated cost to service the claims. A reconciliation of the changes in the Company’s product warranty liability is as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	(In thousands)
Balance at the beginning of the period	$	2,249		$	2,033		$	1,992		$	1,960
Warranty expense	785			348			1,661			1,222
Warranty claims settled	(633		)	(559		)	(1,252		)	(1,360		)
Balance at the end of the period	$	2,401		$	1,822		$	2,401		$	1,822

	As of
	June 30, 2013		December 31, 2012
	(In thousands)
Composition of balance:
Short-term	$	934	$	863
Long-term	1,467		1,129
	$	2,401	$	1,992

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Net Loss Per Share (Tables)

6 Months Ended

Jun. 30, 2013

Potential Common Shares Excluded from Computation of Diluted Net Loss per Share

Such potentially dilutive common share equivalents consist of the following:

	Three and Six Months Ended June 30,
	2013	2012
5.375% Convertible Senior Notes	702,701	702,701
3.75% Convertible Senior Notes	5,487,642	5,487,642
Unvested restricted stock units	1,058,032	860,319
Outstanding options	2,283,054	2,855,080
Outstanding warrants	62,752	62,752
Total dilutive common shares	9,594,181	9,968,494

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Debt (Tables)

6 Months Ended

Jun. 30, 2013

Outstanding Convertible Debt and Related Deferred Financing Costs

The Company had outstanding convertible debt and related deferred financing costs on its consolidated balance sheet as follows (in thousands):

	As of
	June 30, 2013			December 31, 2012
Principal amount of the 5.375% Convertible Senior Notes	$	—		$	15,000
Principal amount of the 3.75% Convertible Senior Notes	143,750			143,750
Unamortized discount	(35,080		)	(40,591		)
Total long-term debt	108,670			118,159
Current portion of debt	—			14,429
Long-term debt	$	108,670		$	103,730
Deferred financing costs	$	1,707		$	2,004

Interest and Other Expense

Interest and other expense related to the 5.375% Notes (as defined below) and the 3.75% Notes (as defined below) was included in interest and other expense on the consolidated statements of operations as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2013		2012		2013		2012
Contractual coupon interest	$	1,460	$	1,549	$	3,009	$	3,098
Accretion of debt discount	2,751		2,387		5,511		4,691
Loss on debt extinguishment	325		—		325		—
Amortization of debt issuance costs	149		149		297		297
Total interest and other expense	$	4,685	$	4,085	$	9,142	$	8,086

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Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 02, 2013
Document Documentand Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	PODD
Entity Registrant Name	INSULET CORP
Entity Central Index Key	0001145197
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		54,418,963

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Capital Lease Obligation (Tables)

6 Months Ended

Jun. 30, 2013

Capital Lease Obligation [Abstract]

Schedule of Future Minimum Lease Payments for Capital Leases

The aggregate future minimum lease payments related to these capital leases as of June 30, 2013, are as follows (in thousands):

Year Ending December 31,	Minimum Lease Payments
2013 (remaining)	906
2014	1,812
2015	1,812
2016	906
Total	$	5,436