10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

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

For the quarterly period ended June 30, 2016

OR

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

For the transition period from_____ to _____

Commission File Number: 001-37557

Penumbra, Inc.

(Exact name of registrant as specified in its charter)

Delaware	05-0605598
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One Penumbra Place Alameda, CA	94502
(Address of principal executive offices)	(Zip code)

(510) 748-3200

(Registrant’s telephone number, including area code)

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:  o

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:  o

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 definition of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer	o		Accelerated Filer	o
Non-accelerated filer	x	(Do not check if a smaller reporting Company)	Smaller Reporting Company	o

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

As of July 15, 2016, the registrant had 31,054,604 shares of common stock, par value $0.001 per share, outstanding.

Penumbra, Inc.

FORM 10-Q

TABLE OF CONTENTS

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Condensed Consolidated Financial Statements (Unaudited)	2
	Condensed Consolidated Balance Sheets	3
	Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)	4
	Condensed Consolidated Statements of Cash Flows	5
	Notes to Condensed Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	19
Item 3.	Quantitative and Qualitative Disclosure about Market Risk	27
Item 4.	Controls and Procedures	28
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	29
Item 1A.	Risk Factors	29
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	30
Item 6.	Exhibits	31
Signatures

PART I - FINANCIAL INFORMATION

ITEM 1. CONDENSED CONSOLIDATED FINANCIAL STATEMENTS.

2

Penumbra, Inc.

Condensed Consolidated Balance Sheets

(unaudited)

(in thousands)

	June 30, 2016			December 31, 2015
Assets
Current assets:
Cash and cash equivalents	$	13,914		$	19,547
Marketable investments	125,949			129,257
Accounts receivable, net of doubtful accounts of $661 and $589 at June 30, 2016 and December 31, 2015, respectively	34,577			29,444
Inventories	68,406			56,761
Prepaid expenses and other current assets	17,406			9,352
Total current assets	260,252			244,361
Property and equipment, net	11,864			8,951
Deferred taxes	11,422			10,143
Other non-current assets	441			393
Total assets	$	283,979		$	263,848
Liabilities and Stockholders’ Equity
Current Liabilities:
Accounts payable	$	4,070		$	2,567
Accrued liabilities	28,119			25,581
Total current liabilities	32,189			28,148
Other non-current liabilities	4,199			3,178
Total liabilities	36,388			31,326
Commitments and contingencies (Note 5)
Stockholders’ Equity:
Common stock	30			30
Additional paid-in capital	266,650			252,087
Notes receivable from stockholder	—			(5		)
Accumulated other comprehensive loss	(2,579		)	(2,115		)
Accumulated deficit	(16,510		)	(17,475		)
Total stockholders’ equity	247,591			232,522
Total liabilities and stockholders’ equity	$	283,979		$	263,848

See accompanying notes to the unaudited condensed consolidated financial statements

3

Penumbra, Inc.

Condensed Consolidated Statements of Operations and Comprehensive Income (Loss)

(unaudited)

(in thousands, except share and per share amounts)

	Three Months Ended June 30,						Six Months Ended June 30,
	2016			2015			2016			2015
Revenue	$	65,106		$	42,311		$	123,025		$	81,263
Cost of revenue	23,636			14,936			41,650			27,160
Gross profit	41,470			27,375			81,375			54,103
Operating expenses:
Research and development	6,264			4,792			11,265			7,983
Sales, general and administrative	35,876			26,396			68,945			45,943
Total operating expenses	42,140			31,188			80,210			53,926
(Loss) Income from operations	(670		)	(3,813		)	1,165			177
Interest income, net	559			177			1,069			385
Other expense, net	(272		)	(542		)	(496		)	(498		)
(Loss) Income before provision for income taxes	(383		)	(4,178		)	1,738			64
(Benefit from) Provision for income taxes	(568		)	(1,507		)	773			233
Net income (loss)	185			(2,671		)	965			(169		)
Foreign currency translation adjustments, net of tax	(1,881		)	327			(833		)	(589		)
Unrealized gains on available-for-sale securities, net of tax	88			193			369			220
Comprehensive (loss) income	$	(1,608	)	$	(2,151	)	$	501		$	(538	)
Net income (loss) attributable to common stockholders (Note 9)	$	185		$	(553	)	$	965		$	(34	)
Net income (loss) per share attributable to common stockholders —Basic	$	0.01		$	(0.11	)	$	0.03		$	(0.01	)
—Diluted	$	0.01		$	(0.11	)	$	0.03		$	(0.01	)
Weighted average shares used to compute net income (loss) per share attributable to common stockholders —Basic	30,210,322			5,096,151			30,100,162			5,000,375
—Diluted	32,693,684			5,096,151			32,542,253			5,000,375

See accompanying notes to the unaudited condensed consolidated financial statements

4

Penumbra, Inc.

Condensed Consolidated Statements of Cash Flows

(unaudited)

(in thousands)

	Six Months Ended June 30,
	2016			2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$	965		$	(169	)
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	1,146			745
Amortization of premium on marketable investments	445			—
Stock-based compensation	6,537			3,616
Excess tax benefit from stock-based compensation	(4,373		)	—
Provision for (release of) doubtful accounts	72			(101		)
Inventory write downs	824			304
Write off of note receivable	—			85
(Release of) provision for sales returns	(208		)	223
Loss on disposal of property and equipment	59			12
Realized (gain) loss on marketable investments	(2		)	541
Provision for product warranty	23			176
Deferred taxes	(207		)	—
Changes in operating assets and liabilities:
Accounts receivable	(5,058		)	(4,940		)
Inventories	(12,035		)	(11,321		)
Prepaid expenses and other current and non-current assets	(5,508		)	(2,759		)
Accounts payable	1,330			548
Accrued expenses and other non-current liabilities	3,435			4,709
Net cash used in operating activities	(12,555		)	(8,331		)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of marketable investments	(27,467		)	(4,069		)
Proceeds from sales of marketable investments	28,962			52,160
Proceeds from maturities of marketable investments	2,504			—
Purchases of property and equipment	(3,695		)	(3,073		)
Net cash provided by investing activities	304			45,018
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of deferred issuance costs	—			(964		)
Proceeds from exercises of stock options	1,493			515
Proceeds from issuance of stock under employee stock purchase plan	3,783			—
Excess tax benefit from stock-based compensation	4,373			—
Payment of employee taxes related to vested restricted stock	(1,846		)	(2,525		)
Net cash provided by (used in) financing activities	7,803			(2,974		)
Effect of foreign exchange rate changes on cash and cash equivalents	(1,185		)	(239		)
Net (Decrease) Increase In Cash And Cash Equivalents	(5,633		)	33,474
CASH AND CASH EQUIVALENTS—Beginning of period	19,547			3,290
CASH AND CASH EQUIVALENTS—End of period	$	13,914		$	36,764
NONCASH INVESTING AND FINANCING ACTIVITIES:
Purchase of property and equipment funded through accounts payable and accrued liabilities	$	560		$	483
Deferred issuance costs not yet paid	$	—		$	620

See accompanying notes to the unaudited condensed consolidated financial statements

5

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

1. Organization and Description of Business

Penumbra, Inc. (the “Company”) is a global interventional therapies company that designs, develops, manufactures and markets innovative medical devices. The Company has a broad portfolio of products that addresses challenging medical conditions and significant clinical needs across two major markets, neuro and peripheral vascular. The conditions that the Company’s products address include, among others, ischemic stroke, hemorrhagic stroke and various peripheral vascular conditions that can be treated through thrombectomy and embolization procedures.

2. Summary of Significant Accounting Policies

Basis of Presentation and Consolidation

The accompanying condensed consolidated balance sheet as of June 30, 2016, the condensed consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015, and the condensed consolidated statements of cash flows for the six months ended June 30, 2016 and 2015 are unaudited. The unaudited condensed consolidated financial statements included herein have been prepared by the Company in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. The condensed consolidated balance sheet as of December 31, 2015 was derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements.

 The unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to state fairly the Company’s financial position as of June 30, 2016, the results of its operations for the three and six months ended June 30, 2016 and 2015, and the cash flows for the six months ended June 30, 2016 and 2015. The results for the three and six months ended June 30, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 or for any other future annual or interim period.

The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2015 included in the Company’s Annual Report on Form 10-K. There have been no changes to the Company’s significant accounting policies during the six months ended June 30, 2016, as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and equity accounts; disclosure of contingent assets and liabilities at the date of the financial statements; and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including those related to marketable investments, provisions for doubtful accounts, sales return reserve, warranty reserves, valuation of inventories, useful lives of property and equipment, income taxes, and contingencies, among others. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other data. Actual results could differ from those estimates.

Segments

The Company determined its operating segment on the same basis that it uses to evaluate its performance internally. The Company has one business activity: the design, development, manufacturing and marketing of innovative medical devices, and operates as one operating segment. The Company’s chief operating decision-maker, its Chief Executive Officer, reviews its operating results for the purpose of allocating resources and evaluating financial performance. The Company determines revenue by geographic area, based on the destination to which it ships its products.

6

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers—Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers—Identifying Performance Obligations and Licensing, which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers—Narrow-Scope improvements and Practical Expedients, which further clarifies the implementation on narrow scope improvements and practical expedients. These standards will be effective for the Company in the first quarter of 2018 pursuant to ASU No. 2015-14, Revenue from Contracts with Customers-Deferral of the Effective Date,issued by the FASB in August 2015. The Company is currently evaluating the impact of adopting these standards.

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which requires an entity to measure most inventory at the lower of cost and net realizable value, thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market. The accounting standard is effective prospectively for annual periods beginning after December 15, 2016, and interim periods therein. Early adoption is permitted as of the beginning of an interim or annual reporting period. The Company is currently evaluating the impact of adopting this standard.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. The new standard is effective for annual periods and interim periods beginning after December 15, 2017 and, upon adoption, an entity should apply the amendments by means of a cumulative-effect adjustment to the balance sheet at the beginning of the first reporting period in which the guidance is effective. Early adoption is not permitted except for the provision to record fair value changes for financial liabilities under the fair value option resulting from instrument-specific credit risk in other comprehensive income. The Company is currently evaluating the impact of adopting this standard.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing accounting standards for leases. Under the new guidance, a lessee will be required to recognize a lease liability and right-of-use asset for all leases with terms in excess of twelve months. The new guidance also modifies the classification criteria and accounting for sales-type and direct financing leases, and requires additional disclosures to enable users of financial statements to understand the amount, timing, and uncertainty of cash flows arising from leases. Consistent with current guidance, a lessee’s recognition, measurement, and presentation of expenses and cash flows arising from a lease will continue to depend primarily on its classification. The accounting standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and must be applied using a modified retrospective approach. Early adoption is permitted. The Company is currently evaluating the impact of adopting this standard.

In March 2016, the FASB issued ASU No. 2016-09, Stock Compensation—Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The accounting standard is effective for annual periods beginning after December 15, 2016, including interim periods within those annual periods. Early adoption is permitted in any interim or annual period. The Company is currently evaluating the impact of adopting this standard.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses. The standard changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The Company will recognize an allowance for credit losses on available-for-sale securities rather than deductions in amortized cost. The standard is effective for fiscal years and interim periods beginning after December 15, 2019. Early adoption is permitted for all periods beginning after December 15, 2018. The Company is currently evaluating the impact of adopting this standard.

7

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

3. Fair Value of Financial Instruments

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:

Level 1 - Quoted prices in active markets for identical assets or liabilities.

Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The categorization of a financial instrument within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement.

The Company classifies its cash equivalents and marketable investments within Level 1 and Level 2, as it uses quoted market prices or alternative pricing sources and models utilizing market observable inputs.

The Company determined the fair value of its Level 1 financial instruments, which are traded in active markets, using quoted market prices for identical instruments.

Marketable investments classified within Level 2 of the fair value hierarchy are valued based on other observable inputs, including broker or dealer quotations or alternative pricing sources. When quoted prices in active markets for identical assets or liabilities are not available, the Company relies on non-binding quotes from its investment managers, which are based on proprietary valuation models of independent pricing services. These models generally use inputs such as observable market data, quoted market prices for similar instruments, historical pricing trends of a security relative to its peers and internal assumptions of the independent pricing services. To validate the fair value determination provided by its investment managers, the Company reviews the pricing movement in the context of overall market trends and trading information from its investment managers. In addition, the Company assesses the inputs and methods used in determining the fair value in order to determine the classification of securities in the fair value hierarchy.

The Company did not own any Level 3 financial assets or liabilities as of June 30, 2016 or December 31, 2015.

During the three and six months ended June 30, 2016 and 2015, the Company did not record impairment charges related to its marketable investments, and the Company did not have any transfers between Level 1, Level 2 or Level 3 of the fair value hierarchy.

The Company did not have any financial assets and liabilities measured at fair value on a non-recurring basis as of June 30, 2016 or December 31, 2015.

8

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

The following table sets forth the Company’s financial assets and liabilities measured at fair value by level within the fair value hierarchy (in thousands):

	As of June 30, 2016
	Level 1		Level 2		Level 3		Fair Value
Financial Assets
Cash equivalents:
Money market funds	$	279	$	—	$	—	$	279
Marketable investments:
Commercial paper	—		10,134		—		10,134
U.S. Treasury	15,512				—		15,512
U.S. agency securities	—		13,521		—		13,521
U.S. states and municipalities	—		15,938		—		15,938
Corporate bonds	—		65,081		—		65,081
Non-U.S. government debt securities	—		5,763		—		5,763
Total	$	15,791	$	110,437	$	—	$	126,228

	As of December 31, 2015
	Level 1		Level 2		Level 3		Fair Value
Financial Assets
Cash equivalents:
Commercial paper	$	—	$	9,850	$	—	$	9,850
Money market funds	252		—		—		252
Marketable investments:
Commercial paper	—		22,332		—		22,332
U.S. Treasury	15,436		—		—		15,436
U.S. agency securities	—		21,464		—		21,464
U.S. states and municipalities	—		2,084		—		2,084
Corporate bonds	—		61,002		—		61,002
Non-U.S. government debt securities	—		6,939		—		6,939
Total	$	15,688	$	123,671	$	—	$	139,359

4. Balance Sheet Components

Cash and Cash Equivalents

The majority of the Company’s cash is held by one financial institution in the United States in excess of federally insured limits. The Company maintained investments in money market funds that were not federally insured during the periods presented and held cash in foreign banks of approximately $2.7 million and $1.9 million at June 30, 2016 and December 31, 2015, respectively, that were not federally insured. The Company has not experienced any losses on its deposits of cash and cash equivalents.

Accounts Receivable, Net

The Company’s allowance for doubtful accounts comprised of the following (in thousands):

Allowance for Doubtful Accounts	June 30, 2016		December 31, 2015
Balance at the beginning of the period	$	589	$	602
Charged to costs and expenses	72		(13		)
Deductions	—		—
Balance at the end of the period	$	661	$	589

9

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

One customer (a distributor) accounted for 10% of the Company’s revenue for each of the three and six months ended June 30, 2016 and 2015. No customer accounted for greater than 10% of the Company’s accounts receivable balance as of June 30, 2016 or December 31, 2015.

Prepaid Expenses and Other Current Assets

The Company’s prepaid expenses and other current assets as of June 30, 2016 and December 31, 2015 were comprised of the following (in thousands):

	June 30, 2016		December 31, 2015
Prepaid Tax	$	6,892	$	2,736
Prepaid expenses	4,753		4,706
Income tax receivable	3,273		606
Other current assets	2,488		1,304
Prepaid expenses and other current assets	$	17,406	$	9,352

Marketable Investments

The Company’s marketable investments as of June 30, 2016 and December 31, 2015 were as follows (in thousands):

	June 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial paper	$	10,128	$	6	$	—		$	10,134
U.S. Treasury	15,478		34		—			15,512
U.S. agency securities	13,487		34		—			13,521
U.S. states and municipalities	15,927		11		—			15,938
Corporate bonds	64,847		236		(2		)	65,081
Non-U.S. government debt securities	5,762		5		(4		)	5,763
Total	$	125,629	$	326	$	(6	)	$	125,949

	December 31, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial paper	$	22,328	$	5	$	(1	)	$	22,332
U.S. Treasury	15,459		4		(27		)	15,436
U.S. agency securities	21,497		1		(34		)	21,464
U.S. states and municipalities	2,086		—		(2		)	2,084
Corporate bonds	61,188		3		(189		)	61,002
Non-U.S. government debt securities	6,954		1		(16		)	6,939
Total	$	129,512	$	14	$	(269	)	$	129,257

10

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

The following tables present the gross unrealized losses and the fair value for those marketable investments that were in an unrealized loss position for less than twelve months as of June 30, 2016 and December 31, 2015 (in thousands):

	June 30, 2016
	Fair Value		Gross Unrealized Losses
U.S. States and Municipalities	2,022		—
Corporate bonds	8,174		(2		)
Non-U.S. government debt securities	1,836		(4		)
Total	$	12,032	$	(6	)

	December 31, 2015
	Fair Value		Gross Unrealized Losses
Commercial paper	$	4,746	$	(1	)
U.S. Treasury	12,453		(27		)
U.S. agency securities	13,475		(34		)
U.S. states and municipalities	2,084		(2		)
Corporate bonds	59,163		(189		)
Non-U.S. government debt securities	5,881		(16		)
Total	$	97,802	$	(269	)

As of June 30, 2016 and December 31, 2015, there were no securities that had been in a loss position for more than twelve months.

The contractual maturities of the Company’s marketable investments as of June 30, 2016 and December 31, 2015 were as follows (in thousands):

	June 30, 2016		December 31, 2015
	Fair Value
Due in one year	$	105,284	$	62,983
Due in one to five years	20,665		66,274
Total	$	125,949	$	129,257

Inventories

Inventories are stated at the lower of cost (determined under the first-in first-out method) or market. Inventory quantities are reviewed in consideration of actual loss experience, projected future demand and remaining shelf life to record a provision for excess and obsolete inventory when appropriate.

The components of inventories as of June 30, 2016 and December 31, 2015 consisted of the following (in thousands):

	June 30, 2016		December 31, 2015
Raw materials	$	10,560	$	9,176
Work in process	3,175		2,746
Finished goods	54,671		44,839
Inventories	$	68,406	$	56,761

11

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

Property and Equipment, Net

Property and equipment, net as of June 30, 2016 and December 31, 2015 consisted of the following (in thousands):

	June 30, 2016			December 31, 2015
Machinery and equipment	$	9,366		$	8,559
Furniture and fixtures	2,808			2,091
Leasehold improvements	2,360			1,564
Software	1,003			666
Computers	671			565
Construction in progress	1,857			577
Total property and equipment	18,065			14,022
Less: Accumulated depreciation and amortization	(6,201		)	(5,071		)
Property and equipment, net	$	11,864		$	8,951

Depreciation and amortization expense was $0.6 million and $0.4 million for the three months ended June 30, 2016 and 2015, respectively, and was $1.1 million and $0.7 million for the six months ended June 30, 2016 and 2015, respectively.

Accrued Liabilities

The following table shows the components of accrued liabilities as of June 30, 2016 and December 31, 2015 (in thousands):

	June 30, 2016		December 31, 2015
Payroll and employee-related expenses	$	15,401	$	13,653
Sales return reserve	3,040		3,247
Preclinical and clinical trial cost	1,769		1,330
Deferred revenue	411		526
Product warranty	735		713
Sales tax payable	497		531
Income tax payable	139		308
Other accrued liabilities	6,127		5,273
Total accrued liabilities	$	28,119	$	25,581

The estimated product warranty accrual as of June 30, 2016 and December 31, 2015 was as follows (in thousands):

	June 30, 2016			December 31, 2015
Balance at the beginning of the period	$	713		$	314
Provision for product warranty	345			752
Settlements of product warranty claims	(323		)	(353		)
Balance at the end of the period	$	735		$	713

12

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

5. Commitments and Contingencies

Lease Commitments

The Company leases its offices and other equipment under non-cancelable operating leases that expire at various dates from 2029 to 2031. Rent expense for non-cancelable operating leases with scheduled rent increases is recognized on a straight-line basis over the lease term. Rent expense for the three months ended June 30, 2016 and 2015 was $1.3 million and $0.8 million, respectively and for the six months ended June 30, 2016 and 2015 was $2.4 million and $1.4 million, respectively. In addition, the Company's lease commitments also require it to make additional payments during the lease term for taxes, insurance and other operating expenses.

Royalty Obligations

In March 2005, the Company entered into a license agreement that requires the Company to make minimum royalty payments to the licensor on a quarterly basis. As of both June 30, 2016 and December 31, 2015, the license agreement required minimum annual royalty payments of $0.1 million in equal quarterly installments. On each January 1, the quarterly calendar year minimum royalty will be adjusted to equal the prior year’s minimum royalty adjusted by a percentage equal to the percentage change in the “consumer price index for all urban consumers” for the prior calendar year as reported by the U.S. Department of Labor. Unless terminated earlier, the term of the license agreement will continue until the expiration of the last to expire patent that covers that licensed product or 2022, whichever is longer.

In April 2012, the Company entered into an agreement that requires the Company to pay, on a quarterly basis, a 5% royalty on sales of products covered under applicable patents. Unless the agreement is terminated earlier, the royalty term for each applicable product will continue until the expirations of the applicable patent covering such product or 2029, whichever is longer.

In November 2013, the Company entered into an agreement that requires the Company to pay, on a quarterly basis, a 3% royalty on the first $5 million in sales and a 1% royalty on sales thereafter of products covered under applicable patents. Unless the agreement is terminated earlier, the royalty for each covered product shall continue until 2030.

In April 2015, the Company entered into a royalty agreement that requires the Company to pay, on a quarterly basis, a 2% royalty on sales of certain products covered by the agreement. Unless the royalty agreement is terminated earlier, the royalty term for each covered product shall continue until 2035.

Royalty expense included in cost of sales for the three months ended June 30, 2016 and 2015 was $0.7 million and $0.4 million, respectively and for the six months ended June 30, 2016 and 2015 was $1.4 million and $0.8 million, respectively.

Contingencies

From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of business. The Company accrues a liability for such matters when it is probable that future expenditures will be made and such expenditures can be reasonably estimated.

Indemnification

The Company enters into standard indemnification arrangements in the ordinary course of business. In many such arrangements, the Company agrees to indemnify, hold harmless, and reimburse the indemnified parties for losses suffered or incurred by the indemnified parties in connection with any trade secret, copyright, patent or other intellectual property infringement claim by any third-party with respect to the Company’s technology. The term of these indemnification agreements is generally perpetual. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable because it involves claims that may be made against the Company in the future, but have not yet been made.

The Company has entered into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual.

The Company has not incurred costs to defend lawsuits or settle claims related to these indemnification agreements.

No liability associated with any of these indemnification requirements has been recorded to date.

13

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

Litigation

The Company was contacted in 2015 by the attorney for a potential product liability claimant who allegedly suffered injuries as a result of an aneurysm procedure in which the Penumbra Coil 400 was used. On February 19, 2016, a complaint for damages was filed on behalf of this claimant against the Company and the hospital involved in the procedure (Montgomery v. Penumbra, Inc., et al., Case No. 16-2-04050-1 SEA, Superior Court of the State of Washington, King County). The suit alleges liability primarily under the Washington Product Liability Act and seeks both compensatory and punitive damages without a specific damages claim. Counsel for the claimant previously indicated that he expects that a jury could award $35 million in damages were this matter to go to trial. This amount is substantially in excess of the Company’s insurance coverage. The hospital defendant had requested indemnification from the Company but was dismissed from the case in July 2016. As formal discovery has only recently commenced, the Company is unable to assess the merits of the plaintiff’s case. The Company intends to vigorously defend the litigation, as the Company believes there will be substantial questions regarding causation, liability and damages.

From time to time, the Company is subject to claims and assessments in the ordinary course of business. The Company is not currently a party to any litigation matter that, individually or in the aggregate, is expected to have a material adverse effect on the Company’s business, financial condition, results of operations or cash flows.

6. Stock-Based Compensation

Stock Options

Activity of stock options under the Penumbra, Inc. 2005 Stock Plan, the Penumbra, Inc. 2011 Equity Incentive Plan and the Amended and Restated Penumbra, Inc. 2014 Equity Incentive Plan (collectively “the Plans”) during the six months ended June 30, 2016 is set forth below:

	Number of Shares		Weighted- Average Exercise Price
Balance at December 31, 2015	3,755,345		$	12.13
Options exercised	(253,555	)	5.80
Options canceled	(11,983	)	19.13
Balance at June 30, 2016	3,489,807		12.56

Restricted Stock and Restricted Stock Units

The following table summarizes the activity of unvested restricted stock and restricted stock units under the Plans during the six months ended June 30, 2016 is set forth below:

	Number of Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2015	849,571		$	15.12
Granted	132,800		46.30
Vested	(128,675	)	14.38
Canceled/Forfeited	(5,000	)	7.75
Unvested and expected to vest at June 30, 2016	848,696		20.16

Employee Stock Purchase Plan

Under the Penumbra, Inc. Employee Stock Purchase Plan (“ESPP”), employees purchased 148,354 shares for $3.8 million during each of the three and six months ended June 30, 2016.

14

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

Stock-based Compensation

The following table sets forth the stock-based compensation expense included in the condensed consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Cost of sales	$	651	$	71	$	660	$	130
Research and development	281		160		539		182
Sales, general and administrative	2,590		3,030		5,338		3,304
Total	$	3,522	$	3,261	$	6,537	$	3,616

As of June 30, 2016, total unrecognized compensation cost was $27.6 million related to unvested share-based compensation arrangements which is expected to be recognized over a weighted average period of 2.7 years.

The total stock-based compensation cost capitalized in inventory was $0.6 million and $0.3 million as of June 30, 2016 and December 31, 2015, respectively.

7. Accumulated Other Comprehensive Income (Loss)

Other comprehensive income (loss) consists of two components: unrealized gains or losses on the Company’s available-for-sale marketable investments, and gains or losses from foreign currency translation adjustments. Until realized and reported as a component of net income, these comprehensive income items accumulate and are included within accumulated other comprehensive income (loss). Unrealized gains and losses on the Company’s marketable investments are reclassified from accumulated other comprehensive income (loss) into earnings when realized upon sale, and are determined based on specific identification of securities sold. Gains and losses from the translation of assets and liabilities denominated in non-U.S. dollar functional currencies are included in accumulated other comprehensive income (loss).

The following table summarizes the changes in the accumulated balances during the three and six months ended June 30, 2016 and 2015, and includes information regarding the manner in which the reclassifications out of accumulated other comprehensive income (loss) into earnings affect the Company’s condensed consolidated statements of operations and comprehensive income (loss) (in thousands):

	Three Months Ended June 30, 2016									Three Months Ended June 30, 2015
	Marketable Investments			Currency Translation Adjustments			Total			Marketable Investments			Currency Translation Adjustments			Total
Balance at beginning of the period	$	118		$	(904	)	$	(786	)	$	(193	)	$	(1,560	)	$	(1,753	)
Other comprehensive income before reclassifications:
Unrealized gains (losses)—marketable investments	138			—			138			(179		)	—			(179		)
Foreign currency translation gains (losses)	—			(1,875		)	(1,875		)	—			347			347
Income tax effect—benefit (expense)	(49		)	(6		)	(55		)	44			(20		)	24
Net of tax	89			(1,881		)	(1,792		)	(135		)	327			192
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	(2		)	—			(2		)	511			—			511
Income tax effect—benefit (expense)	1			—			1			(183		)	—			(183		)
Net of tax	(1		)	—			(1		)	328			—			328
Net current-year other comprehensive income (loss)	88			(1,881		)	(1,793		)	193			327			520
Balance at end of the period	$	206		$	(2,785	)	$	(2,579	)	$	—		$	(1,233	)	$	(1,233	)

15

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

	Six Months Ended June 30, 2016									Six Months Ended June 30, 2015
	Marketable Investments			Currency Translation Adjustments			Total			Marketable Investments			Currency Translation Adjustments			Total
Balance at beginning of the period	$	(163	)	$	(1,952	)	$	(2,115	)	$	(220	)	$	(644	)	$	(864	)
Other comprehensive income before reclassifications:
Unrealized gains (losses)—marketable investments	580			—			580			(162		)	—			(162		)
Foreign currency translation gains (losses)	—			(832		)	(832		)	—			(681		)	(681		)
Income tax effect—benefit (expense)	(209		)	(1		)	(210		)	36			92			128
Net of tax	371			(833		)	(462		)	(126		)	(589		)	(715		)
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	(3		)	—			(3		)	541			—			541
Income tax effect—benefit	1			—			1			(195		)	—			(195		)
Net of tax	(2		)	—			(2		)	346			—			346
Net current-year other comprehensive income (loss)	369			(833		)	(464		)	220			(589		)	(369		)
Balance at end of the period	$	206		$	(2,785	)	$	(2,579	)	$	—		$	(1,233	)	$	(1,233	)

8. Income Taxes

The Company’s income tax expense, deferred tax assets and liabilities, and reserves for unrecognized tax benefits reflect management’s best assessment of estimated current and future taxes to be paid. The Company is subject to income taxes in both the United States and foreign jurisdictions. Significant judgments and estimates are required in determining the consolidated income tax expense. The interim period effective tax rate is based on a forecast of the Company’s full year results.

The Company’s effective tax rate increased to 148.3% for the three months ended June 30, 2016, compared to 36.1% for the three months ended June 30, 2015 primarily attributable to forecasted income and losses. The effective tax rate decreased to 44.5% for the six months ended June 30, 2016, compared to 364.1% for the six months ended June 30, 2015 primarily attributable to forecasted income and losses.

9. Net Income per Share of Common Stock attributable to Common Stockholders

The Company calculated its basic and diluted net income per share attributable to common stockholders for the three and six months ended June 30, 2015 in conformity with the two-class method required for companies with participating securities. Under the two-class method, the Company determined whether it had net income attributable to common stockholders, which included the results of operations less current period preferred stock non-cumulative dividends. If it was determined that the Company did have net income attributable to common stockholders during a period, the related undistributed earnings were then allocated between common stock and the preferred stock based on the weighted average number of shares outstanding during the period to determine the numerator for the basic net income per share attributable to common stockholders. In computing diluted net income attributable to common stockholders, undistributed earnings were re-allocated to reflect the potential impact of dilutive securities to determine the numerator for the diluted net income per share attributable to common stockholders.

The Company’s basic net income per share attributable to common stockholders is calculated by dividing the net income by the weighted average number of shares of common stock outstanding for the period. The diluted net income per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, restricted stock and common stock warrants are considered common stock equivalents.

16

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net income per share attributable to common stockholders for the three and six months ended June 30, 2016 and 2015 is as follows (in thousands, except share and per share amounts):

	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015			2016		2015
Net income per share:
Numerator
Net income (Loss)	$	185	$	(2,671	)	$	965	$	(169	)
Less: Undistributed income attributable to preferred stockholders	—		2,118			—		135
Net income (Loss) attributable to common stockholders—basic and diluted	$	185	$	(553	)	$	965	$	(34	)
Denominator
Weighted average shares used to compute net income attributable to common stockholders —Basic	30,210,322		5,096,151			30,100,162		5,000,375
Potential dilutive options and ESPP shares, as calculated using treasury stock method	2,088,651		—			2,074,286		—
Potential dilutive restricted stock and restricted stock units, as calculated using treasury stock method	394,711		—			367,805		—
Weighted average shares used to compute net income attributable to common stockholders —Diluted	32,693,684		5,096,151			32,542,253		5,000,375
Net income (Loss) per share attributable to common stockholders —Basic	$	0.01	$	(0.11	)	$	0.03	$	(0.01	)
—Diluted	$	0.01	$	(0.11	)	$	0.03	$	(0.01	)

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net income per share of common stock for the periods presented, because the effect of including them would have been anti-dilutive: 

	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Options and ESPP to purchase common stock	—	2,485,392	4,007	2,485,392
Restricted stock and restricted stock units	15,210	755,771	34,928	755,771
Total	15,210	3,241,163	38,935	3,241,163

10. Geographic Areas and Product Sales

The Company’s revenue by geographic area, based on the destination to which the Company ships its products, for the three and six months ended June 30, 2016 and 2015 was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
United States	$	43,692	$	27,619	$	83,104	$	53,970
Japan	6,570		4,152		12,730		8,610
Other International	14,844		10,540		27,191		18,683
Total	$	65,106	$	42,311	$	123,025	$	81,263

17

Penumbra, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

The following table sets forth revenue by product category (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Neuro	$	45,362	$	34,400	$	86,646	$	66,054
Peripheral Vascular	19,744		7,911		36,379		15,209
Total	$	65,106	$	42,311	$	123,025	$	81,263

The Company does not have significant long-lived assets outside the U.S.

18

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the unaudited condensed consolidated financial statements and the related notes thereto included elsewhere in this Quarterly Report on Form 10-Q and the audited consolidated financial statements and notes thereto and management’s discussion and analysis of financial condition and results of operations for the year ended December 31, 2015, included in our Annual Report on Form 10-K filed with the SEC on March 8, 2016.

This Quarterly Report on Form 10-Q contains “forward-looking statements” within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). In some cases, you can identify these statements by forward-looking words such as “may,” “will,” “expect,” “believe,” “anticipate,” “intend,” “could,” “should,” “estimate,” or “continue,” and similar expressions or variations. Such forward-looking statements are subject to risks, uncertainties and other factors that could cause actual results and the timing of certain events to differ materially from future results expressed or implied by such forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those identified below, and those discussed in the section titled “Risk Factors” included in this Quarterly Report on Form 10-Q and our Annual Report on Form 10-K for the year ended December 31, 2015. The forward-looking statements in this Quarterly Report on Form 10-Q represent our views as of the date of this Quarterly Report on Form 10-Q. Except as may be required by law, we assume no obligation to update these forward-looking statements or the reasons that results could differ from these forward-looking statements. You should, therefore, not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this Quarterly Report on Form 10-Q.

Overview

Penumbra, Inc. (“we,” “our,” “us,” “Penumbra,” and the “Company”) is a global interventional therapies company that designs, develops, manufactures and markets innovative medical devices. We have a broad portfolio of products that addresses challenging medical conditions and significant clinical needs across two major markets, neuro and peripheral vascular. The conditions that our products address include, among others, ischemic stroke, hemorrhagic stroke and various peripheral vascular conditions that can be treated through thrombectomy and embolization procedures.

We are an established company focused on the neuro and peripheral vascular markets. We sell our products to hospitals, primarily through our salesforce, as well as through distributors in select international markets. We focus on developing, manufacturing and marketing products for use by specialist physicians, including interventional neuroradiologists, neurosurgeons, interventional neurologists, interventional radiologists and vascular surgeons. We design our products to provide these specialist physicians with a means to drive improved clinical outcomes through faster and safer procedures.

Since our founding in 2004, we have invested heavily in our product development capabilities in our two key markets: neuro and peripheral vascular. We launched our first neurovascular product in 2007, our first peripheral vascular product in 2013 and our first neurosurgical product in 2014. To date, we have launched 16 product brands, and we expect to continue to develop and build our portfolio of products based on our thrombectomy, embolization and access technologies. Generally, when we introduce a next generation product or a new product designed to replace a current product, sales of the earlier generation product or the product replaced decline. Our research and development activities are centered around the development of new products and clinical activities designed to support our regulatory submissions and demonstrate the effectiveness of our products.

We manufacture substantially all of our products at our campus in Alameda, California, and stock inventory of raw materials, components and finished goods primarily at that location. We rely on a single or limited number of suppliers for certain raw materials and components, and we generally have no long-term supply arrangements with our suppliers, as we order on a purchase order basis. We ship all of our products to our hospital customers and distributors worldwide pursuant to purchase orders. We typically recognize revenue when products are delivered to our hospital customers or distributors, other than our coils, which we ship to our hospital customers on a consignment basis, and for which we recognize revenue when the hospital customers utilize products in a procedure.

Hospitals purchase our products for use in procedures performed by their specialist physicians, generally seeking reimbursement from third party payors for procedures performed. We believe that the cost-effectiveness of our products is attractive to our hospital customers.

In the six months ended June 30, 2016 and 2015, 32.4% and 33.6% of our revenue, respectively, was generated from customers located outside of the United States. Our sales outside of the United States are denominated principally in the Euro and Japanese Yen, with our sales in the United Kingdom being denominated in British Pounds. As a result, we have foreign exchange exposure, but do not currently engage in hedging. In the six months ended June 30, 2016, no single hospital and only one distributor accounted for more than 10% of our sales.

19

We sell our products to hospitals primarily through our direct sales organization in the United States, most of Europe, Canada and Australia, as well as through distributors in select international markets. In the six months ended June 30, 2016, we generated revenue of $123.0 million as compared to $81.3 million for the six months ended June 30, 2015, which represents an increase of 51.4%, and in the six months ended June 30, 2016, we generated $1.2 million in operating income as compared to operating income of $0.2 million for the six months ended June 30, 2015, which represents an increase of 558.2%.

Factors Affecting Our Performance

There are a number of factors that have impacted, and we believe will continue to impact, our results of operations and growth. For example:

• The rate at which we grow our salesforce and the speed at which newly hired salespeople become fully effective can impact our revenue growth or our costs incurred in anticipation of such growth.

• Our industry is intensely competitive and, in particular, we compete with a number of large, well-capitalized companies. We must continue to successfully compete in light of our competitors’ existing and future products and their resources to successfully market to the specialist physicians who use our products.

• We must continue to successfully introduce new products that gain acceptance with specialist physicians and successfully transition from existing products to new products, ensuring adequate supply while avoiding excess inventory of older products and resulting inventory write-downs or write-offs. In addition, as we introduce new products, we generally hire and train additional personnel and build our inventory of components and finished goods in advance of sales, which may cause quarterly fluctuations in our financial condition.

• Publications of clinical results by us, our competitors and other third parties can have a significant influence on whether, and the degree to which, our products are used by specialist physicians and the procedures and treatments those physicians choose to administer for a given condition.

• The specialist physicians who use our products may not perform procedures during certain times of the year, such as those periods when they are at major medical conferences or are away from their practices for other reasons, the timing of which occurs irregularly during the year and from year to year.

In addition, we have experienced and expect to continue to experience meaningful variability in our quarterly revenue, gross profit and gross margin as a result of a number of factors, including, but not limited to: the number of available selling days, which can be impacted by holidays; the mix of products sold; the geographic mix of where products are sold; the demand for our products and the products of our competitors; the timing of or failure to obtain regulatory approvals or clearances for products; increased competition; the timing of customer orders; inventory write-offs and write-downs; costs, benefits and timing of new product introductions; the availability and cost of components and raw materials; and fluctuations in foreign currency exchange rates. We experience quarters in which we have significant revenue growth sequentially followed by quarters of moderate or no revenue growth. Additionally, we experience quarters in which operating expenses, in particular research and development expenses, fluctuate depending on the stage and timing of product development.

Components of Results of Operations

Revenue. We sell our products directly to hospitals and through distributors for use in procedures performed by specialist physicians to treat patients in two key markets: neuro and peripheral vascular disease. We sell our products through purchase orders, and we do not have long-term purchase commitments from our customers. We typically recognize revenue when products are delivered to our hospital customers or distributors. However, with respect to products that we consign to hospitals, which primarily consist of coils, we recognize revenue at the time hospitals utilize products in a procedure. Revenue also includes shipping and handling costs that we charge to customers.

Cost of Revenue. Cost of revenue consists primarily of the cost of raw materials and components, personnel costs, including stock-based compensation, inbound freight charges, receiving costs, inspection and testing costs, warehousing costs, royalty expense, shipping and handling costs and other labor and overhead costs incurred in the manufacturing of products. We manufacture substantially all of our products in our manufacturing facility at our campus in Alameda, California.

Operating Expenses

Research and Development (R&D). R&D expenses primarily consist of product development, clinical and regulatory expenses, materials, depreciation and other costs associated with the development of our products. R&D expenses also include salaries, benefits and other related costs, including stock-based compensation, for personnel and consultants. We expense R&D costs as they are incurred.

We expect our R&D expenses to continue to increase in absolute terms as we innovate and develop new products, add personnel and engage in ongoing clinical research.

20

Sales, General and Administrative (SG&A). SG&A expenses primarily consist of salaries, benefits and other related costs, including stock-based compensation, for personnel and consultants engaged in sales, marketing, finance, legal, compliance, administrative, facilities and information technology, medical education and training and human resource activities. Our SG&A expenses also include commissions, generally based on a percentage of sales, to direct sales representatives and the medical device excise tax, which was approximately 2.3% of U.S. sales in 2015. The medical device excise tax has been suspended for a two-year period commencing January 1, 2016; however, it could be reinstated.

We expect our SG&A expenses to continue to increase in absolute terms as we expand our salesforce, marketing programs and operations, including those related to operating as a public company.

Income Tax Expense. We are taxed at the rates applicable within each jurisdiction in which we operate. The composite income tax rate, tax provisions, deferred tax assets and deferred tax liabilities will vary according to the jurisdiction in which profits arise. Tax laws are complex and subject to different interpretations by management and the respective governmental taxing authorities, and require us to exercise judgment in determining our income tax provision, our deferred tax assets and liabilities and the potential valuation allowance recorded against our net deferred tax assets. Deferred tax assets and liabilities are determined using the enacted tax rates in effect for the years in which those tax assets are expected to be realized. A valuation allowance is established when it is more likely than not that the future realization of all or some of the deferred tax assets will not be achieved.

Results of Operations

The following table sets forth the components of our condensed consolidated statements of operations in dollars and as a percentage of revenue for the periods presented:

	Three Months Ended June 30,										Six Months Ended June 30,
	2016					2015					2016					2015
	(in thousands, except for percentages)
Revenue	$	65,106		100.0	%	$	42,311		100.0	%	$	123,025		100.0	%	$	81,263		100.0	%
Cost of revenue	23,636			36.3	%	14,936			35.3	%	41,650			33.9	%	27,160			33.4	%
Gross profit	41,470			63.7	%	27,375			64.7	%	81,375			66.1	%	54,103			66.6	%
Operating expenses:
Research and development	6,264			9.6	%	4,792			11.3	%	11,265			9.2	%	7,983			9.8	%
Sales, general and administrative	35,876			55.1	%	26,396			62.4	%	68,945			56.0	%	45,943			56.5	%
Total operating expenses	42,140			64.7	%	31,188			73.7	%	80,210			65.2	%	53,926			66.4	%
Income (expense) from operations	(670		)	(1.0	)%	(3,813		)	(9.0	)%	1,165			0.9	%	177			0.2	%
Interest income, net	559			0.9	%	177			0.4	%	1,069			0.9	%	385			0.5	%
Other expense, net	(272		)	(0.4	)%	(542		)	(1.3	)%	(496		)	(0.4	)%	(498		)	(0.6	)%
Income before provision for (benefit from) income taxes	(383		)	(0.6	)%	(4,178		)	(9.9	)%	1,738			1.4	%	64			0.1	%
Provision for (benefit from) income taxes	(568		)	(0.9	)%	(1,507		)	(3.6	)%	773			0.6	%	233			0.3	%
Net income (loss)	$	185		0.3	%	$	(2,671	)	(6.3	)%	$	965		0.8	%	$	(169	)	(0.2	)%

Three Months Ended June 30, 2016 Compared to Three Months Ended June 30, 2015

Revenue

	Three Months Ended June 30,				Change
	2016		2015		$		%
	(in thousands, except for percentages)
Neuro	$	45,362	$	34,400	$	10,962	31.9	%
Peripheral Vascular	19,744		7,911		11,833		149.6	%
Total	$	65,106	$	42,311	$	22,795	53.9	%

Revenue increased$22.8 million, or 53.9%, to $65.1 million in the three months ended June 30, 2016, from $42.3 million in the three months ended June 30, 2015. Our revenue growth resulted from increased sales due to expansion of our salesforce headcount by 43%, further market penetration of our existing products and sales of new products or products with new

21

indications. Increased sales within our neuro and peripheral vascular businesses each accounted for approximately half of the revenue increase in the three months ended June 30, 2016.

Revenue from sales in the U. S. increased$16.1 million, or 58.2%, to $43.7 million in the three months ended June 30, 2016, from $27.6 million in the three months ended June 30, 2015. Revenue from sales in international markets increased$6.7 million, or 45.8%, to $21.4 million in the three months ended June 30, 2016, from $14.7 million in the three months ended June 30, 2015. Revenue from international sales represented 32.9% and 34.7% of our total revenue for the three months ended June 30, 2016 and 2015, respectively.

Revenue from our neuro products increased$11.0 million, or 31.9%, to $45.4 million in the three months ended June 30, 2016, from $34.4 million in the three months ended June 30, 2015. Our neuro product sales experienced strong momentum due to further market penetration and growth in the market following the presentation and publication of MR. CLEAN trial results in the fourth quarter of 2014, and the presentation and publication of additional trial results in the first quarter of 2015, all of which support endovascular treatment of stroke. We believe that these published trial results have led to increases in the number of procedures performed by specialist physicians using our products. Increased sales of Penumbra System products accounted for slightly more than half of the neuro revenue increase in the three months ended June 30, 2016. Further, increased sales of our neuro embolization products accounted for approximately 30% of the neuro revenue increase period over period. This increase was due to greater demand for our neuro coil products, which can fluctuate from period to period due to the number of procedures performed in a given period using our products. Prices for our neuro products remained substantially flat during the period.

Revenue from our peripheral vascular products increased$11.8 million, or 149.6%, to $19.7 million in the three months ended June 30, 2016, from $7.9 million in the three months ended June 30, 2015. Our peripheral embolization and peripheral thrombectomy products experienced strong volume growth in the period, primarily due to the focused efforts of our dedicated peripheral vascular salesforce, which was established in the second half of 2014, and further market penetration of our products. Increased sales of Indigo System products accounted for slightly more than two thirds of the peripheral vascular revenue increase in the three months ended June 30, 2016. Prices for our peripheral vascular products remained substantially flat during the period.

Gross Profit and Gross Margin

	Three Months Ended June 30,						Change
	2016			2015			$		%
	(in thousands, except for percentages)
Cost of revenue	$	23,636		$	14,936		$	8,700	58.2	%
Gross profit	$	41,470		$	27,375		$	14,095	51.5	%
Gross margin %	63.7		%	64.7		%

Gross profit increased$14.1 million, or 51.5%, to $41.5 million in the three months ended June 30, 2016, from $27.4 million in the three months ended June 30, 2015. The increase in gross profit was primarily due to an increase in revenue from sales of our neuro and peripheral vascular products.    

Gross margin decreased1.0 percentage point to 63.7% in the three months ended June 30, 2016, from 64.7% in the three months ended June 30, 2015. The decrease in gross margin was due to geographic and product mix, new product launches and additional costs associated with hiring and training additional personnel.

Research and Development (R&D)

	Three Months Ended June 30,						Change
	2016			2015			$		%
	(in thousands, except for percentages)
R&D	$	6,264		$	4,792		$	1,472	30.7	%
R&D as a percentage of revenue	9.6		%	11.3		%

R&D expenses increased by $1.5 million, or 30.7%, to $6.3 million in the three months ended June 30, 2016, from $4.8 million in the three months ended June 30, 2015. The increase was primarily due to a $0.6 million increase in consultant and contractor expenses, $0.4 million increase in personnel-related expense due to a 43% increase in headcount and a $0.3 million increase in facilities and information technology expense.

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Sales, General and Administrative (SG&A)

	Three Months Ended June 30,						Change
	2016			2015			$		%
	(in thousands, except for percentages)
SG&A	$	35,876		$	26,396		$	9,480	35.9	%
SG&A as a percentage of revenue	55.1		%	62.4		%

SG&A expenses increased by $9.5 million, or 35.9%, to $35.9 million in the three months ended June 30, 2016, from $26.4 million in the three months ended June 30, 2015. The increase was primarily due to a $5.2 million increase in personnel-related expense due to a 44% increase in headcount, a $1.1 million increase in travel-related expenses and a $1.1 million increase in facilities and information technology expense.

Provision for Income Taxes

	Three Months Ended June 30,						Change
	2016			2015			$		%
	(in thousands, except for percentages)
Provision for (benefit from) income taxes	$	(568	)	$	(1,507	)	$	939	(62.3	)%
Effective tax rate	148.3		%	36.1		%

Our benefit from income taxes decreased$0.9 million, to $0.6 million in the three months ended June 30, 2016, from $1.5 million in the three months ended June 30, 2015. Our effective tax rate increased to 148.3% for the three months ended June 30, 2016, compared to 36.1% for the three months ended June 30, 2015 primarily attributable to forecasted income and losses. The effective tax rate is based on a forecast of our full year results.

Six Months Ended June 30, 2016 Compared to Six Months Ended June 30, 2015

Revenue

	Six Months Ended June 30,				Change
	2016		2015		$		%
	(in thousands, except for percentages)
Neuro	$	86,646	$	66,054	$	20,592	31.2	%
Peripheral Vascular	36,379		15,209		21,170		139.2	%
Total	$	123,025	$	81,263	$	41,762	51.4	%

Revenue increased$41.8 million, or 51.4%, to $123.0 million in the six months ended June 30, 2016, from $81.3 million in the six months ended June 30, 2015. Our revenue growth resulted from increased sales due to expansion of our salesforce headcount by 43%, further market penetration of our existing products and sales of new products or products with new indications. Increased sales within our neuro and peripheral vascular businesses each accounted for approximately half of the revenue increase in the six months ended June 30, 2016.

Revenue from sales in the U. S. increased$29.1 million, or 54.0%, to $83.1 million in the six months ended June 30, 2016, from $54.0 million in the six months ended June 30, 2015. Revenue from sales in international markets increased$12.6 million, or 46.3%, to $39.9 million in the six months ended June 30, 2016, from $27.3 million in the six months ended June 30, 2015. Revenue from international sales represented 32.4% and 33.6% of our total revenue for the six months ended June 30, 2016 and 2015, respectively.

Revenue from our neuro products increased$20.6 million, or 31.2%, to $86.6 million in the six months ended June 30, 2016, from $66.1 million in the six months ended June 30, 2015. Our neuro product sales experienced strong momentum due to further market penetration and growth in the market following the presentation and publication of MR. CLEAN trial results in the fourth quarter of 2014, and the presentation and publication of additional trial results in the first quarter of 2015, all of which support endovascular treatment of stroke. We believe that these published trial results have led to increases in the number of procedures performed by specialist physicians using our products. Increased sales of Penumbra System products accounted for slightly more than half of the neuro revenue increase in the six months ended June 30, 2016. Further, increased sales of our neuro embolization products accounted for slightly more than one quarter of the neuro revenue increase period over period. This increase was due to greater demand for our neuro coil products, which can fluctuate from period to period due to the number of procedures performed in a given period using our products. Prices for our neuro products remained substantially flat during the period.

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Revenue from our peripheral vascular products increased$21.2 million, or 139.2%, to $36.4 million in the six months ended June 30, 2016, from $15.2 million in the six months ended June 30, 2015. Our peripheral embolization and peripheral thrombectomy products experienced strong volume growth in the period, primarily due to the focused efforts of our dedicated peripheral vascular salesforce, which was established in the second half of 2014, and further market penetration of our products. Increased sales of Indigo System products accounted approximately two thirds of the peripheral vascular revenue increase in the six months ended June 30, 2016. Prices for our peripheral vascular products remained substantially flat during the period.

Gross Profit and Gross Margin

	Six Months Ended June 30,						Change
	2016			2015			$		%
	(in thousands, except for percentages)
Cost of revenue	$	41,650		$	27,160		$	14,490	53.4	%
Gross profit	$	81,375		$	54,103		$	27,272	50.4	%
Gross margin %	66.1		%	66.6		%

Gross profit increased$27.3 million, or 50.4%, to $81.4 million in the six months ended June 30, 2016, from $54.1 million in the six months ended June 30, 2015. The increase in gross profit was primarily due to an increase in revenue from sales of our neuro and peripheral vascular products.

Gross margin decreased0.5 percentage point to 66.1% in the six months ended June 30, 2016, from 66.6% in the six months ended June 30, 2015. The decrease in gross margin was due to geographic and product mix, new product launches and additional costs associated with hiring and training additional personnel.

Research and Development (R&D)

	Six Months Ended June 30,						Change
	2016			2015			$		%
	(in thousands, except for percentages)
R&D	$	11,265		$	7,983		$	3,282	41.1	%
R&D as a percentage of revenue	9.2		%	9.8		%

R&D expenses increased by $3.3 million, or 41.1%, to $11.3 million in the six months ended June 30, 2016, from $8.0 million in the six months ended June 30, 2015. The increase was primarily due to a $1.3 million increase in personnel-related expense due to a 43% increase in headcount, a $0.8 million increase in consultant and contractor expenses and a $0.7 million increase in facilities and information technology expense.

Sales, General and Administrative (SG&A)

	Six Months Ended June 30,						Change
	2016			2015			$		%
	(in thousands, except for percentages)
SG&A	$	68,945		$	45,943		$	23,002	50.1	%
SG&A as a percentage of revenue	56.0		%	56.5		%

SG&A expenses increased by $23.0 million, or 50.1%, to $68.9 million in the six months ended June 30, 2016, from $45.9 million in the six months ended June 30, 2015. The increase was primarily due to a $13.7 million increase in personnel-related expense due to a 44% increase in headcount, a $2.1 million increase due to expanded marketing programs and a $2.1 million increase in travel-related expenses.

Provision for Income Taxes

	Six Months Ended June 30,						Change
	2016			2015			$		%
	(in thousands, except for percentages)
Provision for income taxes	$	773		$	233		$	540	nm
Effective tax rate	44.5		%	364.1		%

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Our provision from income taxes increased$0.5 million, to $0.8 million in the six months ended June 30, 2016, from $0.2 million in the six months ended June 30, 2015. Our effective tax rate decreased to 44.5% for the six months ended June 30, 2016, compared to 364.1% for the six months ended June 30, 2015 primarily attributable to forecasted income and losses. The effective tax rate is based on a forecast of our full year results.

Liquidity and Capital Resources

As of June 30, 2016, we had $228.1 million in working capital, which included $13.9 million in cash and $125.9 million in marketable investments.

In addition to our existing cash and cash equivalents and marketable investment balances, our principal source of liquidity is our accounts receivable. We believe these sources will be sufficient to meet our liquidity requirements for at least the next 12 months. Our principal liquidity requirements are to fund our operations, including our research and development, and capital expenditures. To facilitate our growth, we may also lease or purchase additional facilities. We expect to continue to make investments as we launch new products, expand our manufacturing operations and further expand into international markets. We may, however, require or elect to secure additional financing as we continue to execute our business strategy. If we require or elect to raise additional funds, we may do so through equity or debt financing, which may not be available on acceptable terms, could result in dilution to our stockholders and could require us to agree to covenants that limit our operating flexibility.

	June 30, 2016		December 31, 2015
	(in thousands)
Cash and cash equivalents	$	13,914	$	19,547
Marketable investments	125,949		129,257
Accounts receivable, net	34,577		29,444
Accounts payable	4,070		2,567
Accrued liabilities	28,119		25,581
Working capital(1)	228,063		216,213

__________________

(1) Working capital consists of total current assets less total current liabilities.

The following table sets forth, for the periods indicated, our beginning balance of cash and cash equivalents, net cash flows provided by (used in) operating, investing and financing activities and our ending balance of cash and cash equivalents:

	Six Months Ended June 30,
	2016			2015
	(in thousands)
Cash and cash equivalents at beginning of period	$	19,547		$	3,290
Net cash used in operating activities	(12,555		)	(8,331		)
Net cash provided by investing activities	304			45,018
Net cash provided by (used in) financing activities	7,803			(2,974		)
Cash and cash equivalents at end of period	13,914			36,764

Net Cash Used in Operating Activities

Net cash used in operating activities consists primarily of net income adjusted for certain non-cash items (including depreciation and amortization, inventory write downs, stock-based compensation expense, amortization of premium on marketable investments, provision for doubtful accounts, provision for sales returns, loss on disposal of property and equipment, provision for product warranty), and the effect of changes in working capital and other activities.

Net cash used in operating activities was $12.6 million during the six months ended June 30, 2016 and consisted of net income of $1.0 million and non-cash items of $4.3 million offset by net changes in operating assets and liabilities of $17.8 million. The change in operating assets and liabilities include the increase in inventories of $12.0 million to support our revenue growth, an increase in prepaid expenses and other current and non-current assets of $5.5 million and an increase in accounts receivable of $5.1 million, partially offset by an increase in accrued expenses and other non-current liabilities of $3.4 million and accounts payable of $1.3 million, as a result of the growth in our business activities.

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Net cash used in operating activities was $8.3 million during the six months ended June 30, 2015 and consisted of a net loss of $0.2 million and net changes in operating assets and liabilities of $13.8 million, partially offset by non-cash items of $5.6 million. The change in operating assets and liabilities include the increase in inventories of $11.3 million to support our revenue growth, an increase in accounts receivable of $4.9 million, an increase in prepaid expenses and other current assets of$2.8 million, partially offset by an increase in accrued expenses and other non-current liabilities of $4.7 million and accounts payable of $0.5 million, respectively, as a result of the growth in our business activities.

Net Cash Provided by Investing Activities

Net cash provided by investing activities relates primarily to proceeds from sales or maturities of marketable investments, offset by capital expenditures.

Net cash provided by investing activities was $0.3 million during the six months ended June 30, 2016 and consisted of net proceeds from sales and maturities of marketable investments of $4.0 million, offset by capital expenditures of $3.7 million.

Net cash provided by investing activities was $45.0 million during the six months ended June 30, 2015 and consisted of the net proceeds from sales of marketable investments of $48.1 million partially offset by capital expenditures of $3.1 million.

Net Cash Provided by (Used in) Financing Activities

Net cash from financing activities primarily relates to stock option exercises, issuance of stock under ESPP and excess tax benefit from stock-based compensation.

Financing activities in the six months ended June 30, 2016 provided net cash of $7.8 million due to payment of employee taxes related to vested restricted stock of $1.8 million, offset by excess tax benefit from stock-based compensation of $4.4 million, proceeds from exercises of stock options of $1.5 million, and proceeds from issuance of stock under employee stock purchase plan of $3.8 million.

Financing activities in the six months ended June 30, 2015 used net cash of $3.0 million and consisted of payment of employee taxes related to vested common and restricted stock of $2.5 million and payments of deferred issuance costs of $1.0 million, partially offset by proceeds from exercises of stock options of $0.5 million.

Contractual Obligations and Commitments

Our contractual obligations and commitments as of June 30, 2016 have not materially changed from those disclosed in our Annual Report on Form 10-K for the year ended December 31, 2015.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements or any holdings in variable interest entities.

Critical Accounting Policies and Estimates

We have prepared our financial statements in accordance with U.S. GAAP. Our preparation of these financial statements requires us to make estimates, assumptions, and judgments that affect the reported amounts of assets, liabilities, expenses, and related disclosures at the date of the financial statements, as well as revenue and expenses recorded during the reporting periods. We evaluate our estimates and judgments on an ongoing basis. We base our estimates on historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results could therefore differ materially from these estimates under different assumptions or conditions.

There have been no material changes to our critical accounting policies from those described in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in our Annual Report on Form 10-K for the year ended December 31, 2015.

Recently Issued Accounting Standards

For information with respect to recently issued accounting standards and the impact of these standards on our consolidated financial statements, see Note 2 “Summary of Significant Accounting Policies” to our condensed consolidated financial statements in Part I, Item 1 of this Quarterly Report on Form 10-Q.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

We are exposed to various market risks, which may result in potential losses arising from adverse changes in market rates, such as interest rates and foreign exchange rates. We do not enter into derivatives or other financial instruments for trading or speculative purposes and do not believe we are exposed to material market risk with respect to our cash and cash equivalents and/or our marketable investments.

Interest Rate Risk. We had cash and cash equivalents of $13.9 million as of June 30, 2016, which consisted of funds held in general checking and savings accounts. In addition, we had marketable investments of $125.9 million, which consisted primarily of corporate bonds, U.S. agency securities, commercial paper and U.S. Treasury. Our investment policy is focused on the preservation of capital and supporting our liquidity needs. Under the policy, we invest in highly rated securities, while limiting the amount of credit exposure to any one issuer other than the U.S. government. We do not invest in financial instruments for trading or speculative purposes, nor do we use leveraged financial instruments. We utilize external investment managers who adhere to the guidelines of our investment policy. A hypothetical 100 basis point change in interest rates would not have a material impact on the value of our cash and cash equivalents or marketable investments.

Foreign Exchange Risk Management. We operate in countries other than the U. S., and, therefore, we are exposed to foreign currency risks. We bill most sales outside of the U. S. in local currencies, primarily the Euro and Japanese Yen. We expect that the percentage of our sales denominated in foreign currencies may increase in the foreseeable future as we continue to expand into international markets. When sales or expenses are not denominated in U.S. Dollars, a fluctuation in exchange rates could affect our net income. We do not believe an immediate 10% adverse change in foreign exchange rates would have a material effect on our results of operations. We do not currently hedge our exposure to foreign currency exchange rate fluctuations; however, we may choose to hedge our exposure in the future.

We do not believe that inflation and change in prices had a significant impact on our results of operations for any periods presented on our condensed consolidated financial statements.

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ITEM 4. CONTROLS AND PROCEDURES.

Evaluation of Disclosure Controls and Procedures

We have established disclosure controls and procedures that are designed to ensure that the information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms and that such information is accumulated and communicated to management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

Our management, including our principal executive officer and principal financial officer, evaluated the effectiveness of our disclosure controls and procedures. Based on this review, the principal executive officer and principal financial officer of the Company have concluded that the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) were effective as of June 30, 2016.

Changes in Internal Control Over Financial Reporting

There was no change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that occurred during the quarterly period ended June 30, 2016 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II - OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS.

We were contacted in 2015 by the attorney for a potential product liability claimant who allegedly suffered injuries as a result of an aneurysm procedure in which the Penumbra Coil 400 was used. On February 19, 2016, a complaint for damages was filed on behalf of this claimant against the Company and the hospital involved in the procedure (Montgomery v. Penumbra, Inc., et al., Case No. 16-2-04050-1 SEA, Superior Court of the State of Washington, King County). The suit alleges liability primarily under the Washington Product Liability Act and seeks both compensatory and punitive damages without a specific damages claim. Counsel for the claimant previously indicated that he expects that a jury could award $35 million in damages were this matter to go to trial. This amount is substantially in excess of our insurance coverage. The hospital defendant had requested indemnification from the Company, but was dismissed from the case in July 2016. As formal discovery has only recently commenced, we are unable to assess the merits of the plaintiff’s case. We intend to vigorously defend the litigation, as we believe there will be substantial questions regarding causation, liability and damages.

From time to time, we are subject to claims and assessments in the ordinary course of business. We are not currently a party to any litigation matter that, individually or in the aggregate, is expected to have a material adverse effect on our business, financial condition, results of operations or cash flows.

ITEM 1A. RISK FACTORS.

There have been no material changes to our risk factors reported or new factors identified since the filing of our Annual Report on Form 10-K for the year ended December 31, 2015, which was filed with the SEC on March 8, 2016.

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ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.

(a) Sales of Unregistered Securities

None.

(b) Use of Proceeds from Public Offering of Common Stock

Our Registration Statement on Form S-1 (File No. 333-206412) and our Registration Statement on Form S-1 (File No. 333-207000) filed pursuant to Rule 462(b) relating thereto, each relating to the initial public offering of shares of our common stock, became effective on September 17, 2015. There has been no material change in the planned use of proceeds from our initial public offering from that described in the prospectus dated September 17, 2015 filed with the SEC pursuant to Rule 424(b)(4) under the Securities Act. Pending the planned use of proceeds, we have invested the funds received from our initial public offering in marketable investments.

(c) Issuer Purchases of Equity Securities

None.

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ITEM 6. EXHIBITS.

Exhibit Number	Description	Form	File No.	Exhibit(s)	Filing Date
31.1*	Certification of Principal Executive Officer Required Under Rule 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as amended.
31.2*	Certification of Principal Financial Officer Required Under Rule 13a-14(a) and 15d-14(a) of the Securities Exchange Act of 1934, as amended.
32.1**	Certification of Principal Executive Officer and Principal Financial Officer Required Under Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, and 18 U.S.C. §1350.
101*	The following materials from the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2016 formatted in Extensible Business Reporting Language (XBRL) includes: (i) Condensed Consolidated Balance Sheets as of June 30, 2016 and December 31, 2015, (ii) Condensed Consolidated Statements of Income and Comprehensive Income (Loss) for the three and six months ended June 30, 2016 and 2015, (iii) Condensed Consolidated Statements of Cash Flows for the six months ended June 30, 2016 and 2015, and (iv) Notes to Condensed Consolidated Financial Statements.

* Filed herewith.    

** Furnished herewith.

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SIGNATURES

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

		PENUMBRA, INC.
Date: August 9, 2016
	By:	/s/ Sri Kosaraju
		Sri Kosaraju
		Chief Financial Officer and Head of Strategy
		(Principal Financial and Accounting Officer)

32

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES EXCHANGE ACT, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Adam Elsesser, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Penumbra, Inc.;

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)) 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) (Omitted pursuant to Exchange Act Rule 13a-14);

(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.

Date: August 9, 2016

/s/ Adam Elsesser

Adam Elsesser

Chairman, Chief Executive Officer and President

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO RULE 13a-14(a) AND 15d-14(a) OF THE SECURITIES EXCHANGE ACT, AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Sri Kosaraju, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Penumbra, Inc.;

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)) 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) (Omitted pursuant to Exchange Act Rule 13a-14);

(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.

Date: August 9, 2016

/s/ Sri Kosaraju

Sri Kosaraju

Chief Financial Officer and Head of Strategy

EX-32.1

Exhibit 32.1

PENUMBRA, INC.

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of Penumbra, Inc. (the “Company”) on Form 10-Q for the fiscal quarter ended June 30, 2016, as filed with the Securities and Exchange Commission (the “Report”), Adam Elsesser, Chairman, Chief Executive Officer and President of the Company, and Sri Kosaraju, Chief Financial Officer and Head of Strategy of the Company, respectively, do each hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

• The information in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 9, 2016

/s/ Adam Elsesser

Adam Elsesser

Chairman, Chief Executive Officer and President

/s/ Sri Kosaraju

Sri Kosaraju

Chief Financial Officer and Head of Strategy

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Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2016	Jul. 15, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	Penumbra Inc
Entity Central Index Key	0001321732
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		31,054,604

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 13,914	$ 19,547
Marketable investments	125,949	129,257
Accounts receivable, net of doubtful accounts of $661 and $589 at June 30, 2016 and December 31, 2015, respectively	34,577	29,444
Inventories	68,406	56,761
Prepaid expenses and other current assets	17,406	9,352
Total current assets	260,252	244,361
Property and equipment, net	11,864	8,951
Deferred taxes	11,422	10,143
Other non-current assets	441	393
Total assets	283,979	263,848
Current Liabilities:
Accounts payable	4,070	2,567
Accrued liabilities	28,119	25,581
Total current liabilities	32,189	28,148
Other non-current liabilities	4,199	3,178
Total liabilities	36,388	31,326
Commitments and contingencies
Stockholders’ Equity:
Common stock	30	30
Additional paid-in capital	266,650	252,087
Notes receivable from stockholder	0	(5)
Accumulated other comprehensive loss	(2,579)	(2,115)
Accumulated deficit	(16,510)	(17,475)
Total stockholders’ equity	247,591	232,522
Total liabilities and stockholders’ equity	$ 283,979	$ 263,848

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Allowance for doubtful accounts	$ 661	$ 589	$ 602

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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
Revenue	$ 65,106	$ 42,311	$ 123,025	$ 81,263
Cost of revenue	23,636	14,936	41,650	27,160
Gross profit	41,470	27,375	81,375	54,103
Operating expenses:
Research and development	6,264	4,792	11,265	7,983
Sales, general and administrative	35,876	26,396	68,945	45,943
Total operating expenses	42,140	31,188	80,210	53,926
(Loss) Income from operations	(670)	(3,813)	1,165	177
Interest income, net	559	177	1,069	385
Other expense, net	(272)	(542)	(496)	(498)
(Loss) Income before provision for income taxes	(383)	(4,178)	1,738	64
(Benefit from) Provision for income taxes	(568)	(1,507)	773	233
Net income (loss)	185	(2,671)	965	(169)
Foreign currency translation adjustments, net of tax	(1,881)	327	(833)	(589)
Unrealized gains on available-for-sale securities, net of tax	88	193	369	220
Comprehensive (loss) income	(1,608)	(2,151)	501	(538)
Net income (loss) attributable to common stockholders	$ 185	$ (553)	$ 965	$ (34)
Net income (loss) per share attributable to common stockholders — Basic (in dollars per share)	$ 0.01	$ (0.11)	$ 0.03	$ (0.01)
Net income (loss) per share attributable to common stockholders — Diluted (in dollars per share)	$ 0.01	$ (0.11)	$ 0.03	$ (0.01)
Weighted average shares used to compute net income (loss) per share attributable to common stockholders — Basic (in shares)	30,210,322	5,096,151	30,100,162	5,000,375
Weighted average shares used to compute net income (loss) attributable to common stockholders —Diluted (in shares)	32,693,684	5,096,151	32,542,253	5,000,375

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 965	$ (169)
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	1,146	745
Amortization of premium on marketable investments	445	0
Stock-based compensation	6,537	3,616
Excess tax benefit from stock-based compensation	(4,373)	0
Provision for (release of) doubtful accounts	72	(101)
Inventory write downs	824	304
Write off of note receivable	0	85
(Release of) provision for sales returns	(208)	223
Loss on disposal of property and equipment	59	12
Realized (gain) loss on marketable investments	(2)	541
Provision for product warranty	23	176
Deferred taxes	(207)	0
Changes in operating assets and liabilities:
Accounts receivable	(5,058)	(4,940)
Inventories	(12,035)	(11,321)
Prepaid expenses and other current and non-current assets	(5,508)	(2,759)
Accounts payable	1,330	548
Accrued expenses and other non-current liabilities	3,435	4,709
Net cash used in operating activities	(12,555)	(8,331)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of marketable investments	(27,467)	(4,069)
Proceeds from sales of marketable investments	28,962	52,160
Proceeds from maturities of marketable investments	2,504	0
Purchases of property and equipment	(3,695)	(3,073)
Net cash provided by investing activities	304	45,018
CASH FLOWS FROM FINANCING ACTIVITIES:
Payment of deferred issuance costs	0	(964)
Proceeds from exercises of stock options	1,493	515
Proceeds from issuance of stock under employee stock purchase plan	3,783	0
Excess tax benefit from stock-based compensation	4,373	0
Payment of employee taxes related to vested restricted stock	(1,846)	(2,525)
Net cash provided by (used in) financing activities	7,803	(2,974)
Effect of foreign exchange rate changes on cash and cash equivalents	(1,185)	(239)
Net (Decrease) Increase In Cash And Cash Equivalents	(5,633)	33,474
CASH AND CASH EQUIVALENTS—Beginning of period	19,547	3,290
CASH AND CASH EQUIVALENTS—End of period	13,914	36,764
NONCASH INVESTING AND FINANCING ACTIVITIES:
Purchase of property and equipment funded through accounts payable and accrued liabilities	560	483
Deferred issuance costs not yet paid	$ 0	$ 620

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Organization and Description of Business

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Description of Business

Organization and Description of Business

Penumbra, Inc. (the “Company”) is a global interventional therapies company that designs, develops, manufactures and markets innovative medical devices. The Company has a broad portfolio of products that addresses challenging medical conditions and significant clinical needs across two major markets, neuro and peripheral vascular. The conditions that the Company’s products address include, among others, ischemic stroke, hemorrhagic stroke and various peripheral vascular conditions that can be treated through thrombectomy and embolization procedures.

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation and Consolidation

The accompanying condensed consolidated balance sheet as of June 30, 2016, the condensed consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015, and the condensed consolidated statements of cash flows for the six months ended June 30, 2016 and 2015 are unaudited. The unaudited condensed consolidated financial statements included herein have been prepared by the Company in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. The condensed consolidated balance sheet as of December 31, 2015 was derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements.

 The unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to state fairly the Company’s financial position as of June 30, 2016, the results of its operations for the three and six months ended June 30, 2016 and 2015, and the cash flows for the six months ended June 30, 2016 and 2015. The results for the three and six months ended June 30, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 or for any other future annual or interim period.

The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2015 included in the Company’s Annual Report on Form 10-K. There have been no changes to the Company’s significant accounting policies during the six months ended June 30, 2016, as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and equity accounts; disclosure of contingent assets and liabilities at the date of the financial statements; and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including those related to marketable investments, provisions for doubtful accounts, sales return reserve, warranty reserves, valuation of inventories, useful lives of property and equipment, income taxes, and contingencies, among others. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other data. Actual results could differ from those estimates.

Segments

The Company determined its operating segment on the same basis that it uses to evaluate its performance internally. The Company has one business activity: the design, development, manufacturing and marketing of innovative medical devices, and operates as one operating segment. The Company’s chief operating decision-maker, its Chief Executive Officer, reviews its operating results for the purpose of allocating resources and evaluating financial performance. The Company determines revenue by geographic area, based on the destination to which it ships its products.

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers—Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers—Identifying Performance Obligations and Licensing, which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers—Narrow-Scope improvements and Practical Expedients, which further clarifies the implementation on narrow scope improvements and practical expedients. These standards will be effective for the Company in the first quarter of 2018 pursuant to ASU No. 2015-14, Revenue from Contracts with Customers-Deferral of the Effective Date,issued by the FASB in August 2015. The Company is currently evaluating the impact of adopting these standards.

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which requires an entity to measure most inventory at the lower of cost and net realizable value, thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market. The accounting standard is effective prospectively for annual periods beginning after December 15, 2016, and interim periods therein. Early adoption is permitted as of the beginning of an interim or annual reporting period. The Company is currently evaluating the impact of adopting this standard.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. The new standard is effective for annual periods and interim periods beginning after December 15, 2017 and, upon adoption, an entity should apply the amendments by means of a cumulative-effect adjustment to the balance sheet at the beginning of the first reporting period in which the guidance is effective. Early adoption is not permitted except for the provision to record fair value changes for financial liabilities under the fair value option resulting from instrument-specific credit risk in other comprehensive income. The Company is currently evaluating the impact of adopting this standard.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing accounting standards for leases. Under the new guidance, a lessee will be required to recognize a lease liability and right-of-use asset for all leases with terms in excess of twelve months. The new guidance also modifies the classification criteria and accounting for sales-type and direct financing leases, and requires additional disclosures to enable users of financial statements to understand the amount, timing, and uncertainty of cash flows arising from leases. Consistent with current guidance, a lessee’s recognition, measurement, and presentation of expenses and cash flows arising from a lease will continue to depend primarily on its classification. The accounting standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and must be applied using a modified retrospective approach. Early adoption is permitted. The Company is currently evaluating the impact of adopting this standard.

In March 2016, the FASB issued ASU No. 2016-09, Stock Compensation—Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The accounting standard is effective for annual periods beginning after December 15, 2016, including interim periods within those annual periods. Early adoption is permitted in any interim or annual period. The Company is currently evaluating the impact of adopting this standard.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses. The standard changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The Company will recognize an allowance for credit losses on available-for-sale securities rather than deductions in amortized cost. The standard is effective for fiscal years and interim periods beginning after December 15, 2019. Early adoption is permitted for all periods beginning after December 15, 2018. The Company is currently evaluating the impact of adopting this standard.

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Fair Value of Financial Instruments

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

Fair Value of Financial Instruments

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants at the measurement date. The accounting guidance establishes a three-tiered hierarchy, which prioritizes the inputs used in the valuation methodologies in measuring fair value:

Level 1 - Quoted prices in active markets for identical assets or liabilities.

Level 2 - Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The categorization of a financial instrument within the valuation hierarchy is based on the lowest level of input that is significant to the fair value measurement.

The Company classifies its cash equivalents and marketable investments within Level 1 and Level 2, as it uses quoted market prices or alternative pricing sources and models utilizing market observable inputs.

The Company determined the fair value of its Level 1 financial instruments, which are traded in active markets, using quoted market prices for identical instruments.

Marketable investments classified within Level 2 of the fair value hierarchy are valued based on other observable inputs, including broker or dealer quotations or alternative pricing sources. When quoted prices in active markets for identical assets or liabilities are not available, the Company relies on non-binding quotes from its investment managers, which are based on proprietary valuation models of independent pricing services. These models generally use inputs such as observable market data, quoted market prices for similar instruments, historical pricing trends of a security relative to its peers and internal assumptions of the independent pricing services. To validate the fair value determination provided by its investment managers, the Company reviews the pricing movement in the context of overall market trends and trading information from its investment managers. In addition, the Company assesses the inputs and methods used in determining the fair value in order to determine the classification of securities in the fair value hierarchy.

The Company did not own any Level 3 financial assets or liabilities as of June 30, 2016 or December 31, 2015.

During the three and six months ended June 30, 2016 and 2015, the Company did not record impairment charges related to its marketable investments, and the Company did not have any transfers between Level 1, Level 2 or Level 3 of the fair value hierarchy.

The Company did not have any financial assets and liabilities measured at fair value on a non-recurring basis as of June 30, 2016 or December 31, 2015.

The following table sets forth the Company’s financial assets and liabilities measured at fair value by level within the fair value hierarchy (in thousands):

	As of June 30, 2016
	Level 1		Level 2		Level 3		Fair Value
Financial Assets
Cash equivalents:
Money market funds	$	279	$	—	$	—	$	279
Marketable investments:
Commercial paper	—		10,134		—		10,134
U.S. Treasury	15,512				—		15,512
U.S. agency securities	—		13,521		—		13,521
U.S. states and municipalities	—		15,938		—		15,938
Corporate bonds	—		65,081		—		65,081
Non-U.S. government debt securities	—		5,763		—		5,763
Total	$	15,791	$	110,437	$	—	$	126,228

	As of December 31, 2015
	Level 1		Level 2		Level 3		Fair Value
Financial Assets
Cash equivalents:
Commercial paper	$	—	$	9,850	$	—	$	9,850
Money market funds	252		—		—		252
Marketable investments:
Commercial paper	—		22,332		—		22,332
U.S. Treasury	15,436		—		—		15,436
U.S. agency securities	—		21,464		—		21,464
U.S. states and municipalities	—		2,084		—		2,084
Corporate bonds	—		61,002		—		61,002
Non-U.S. government debt securities	—		6,939		—		6,939
Total	$	15,688	$	123,671	$	—	$	139,359

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Balance Sheet Components

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Balance Sheet Components

Balance Sheet Components

Cash and Cash Equivalents

The majority of the Company’s cash is held by one financial institution in the United States in excess of federally insured limits. The Company maintained investments in money market funds that were not federally insured during the periods presented and held cash in foreign banks of approximately $2.7 million and $1.9 million at June 30, 2016 and December 31, 2015, respectively, that were not federally insured. The Company has not experienced any losses on its deposits of cash and cash equivalents.

Accounts Receivable, Net

The Company’s allowance for doubtful accounts comprised of the following (in thousands):

Allowance for Doubtful Accounts	June 30, 2016		December 31, 2015
Balance at the beginning of the period	$	589	$	602
Charged to costs and expenses	72		(13		)
Deductions	—		—
Balance at the end of the period	$	661	$	589

One customer (a distributor) accounted for 10% of the Company’s revenue for each of the three and six months ended June 30, 2016 and 2015. No customer accounted for greater than 10% of the Company’s accounts receivable balance as of June 30, 2016 or December 31, 2015.

Prepaid Expenses and Other Current Assets

The Company’s prepaid expenses and other current assets as of June 30, 2016 and December 31, 2015 were comprised of the following (in thousands):

	June 30, 2016		December 31, 2015
Prepaid Tax	$	6,892	$	2,736
Prepaid expenses	4,753		4,706
Income tax receivable	3,273		606
Other current assets	2,488		1,304
Prepaid expenses and other current assets	$	17,406	$	9,352

Marketable Investments

The Company’s marketable investments as of June 30, 2016 and December 31, 2015 were as follows (in thousands):

	June 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial paper	$	10,128	$	6	$	—		$	10,134
U.S. Treasury	15,478		34		—			15,512
U.S. agency securities	13,487		34		—			13,521
U.S. states and municipalities	15,927		11		—			15,938
Corporate bonds	64,847		236		(2		)	65,081
Non-U.S. government debt securities	5,762		5		(4		)	5,763
Total	$	125,629	$	326	$	(6	)	$	125,949

	December 31, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial paper	$	22,328	$	5	$	(1	)	$	22,332
U.S. Treasury	15,459		4		(27		)	15,436
U.S. agency securities	21,497		1		(34		)	21,464
U.S. states and municipalities	2,086		—		(2		)	2,084
Corporate bonds	61,188		3		(189		)	61,002
Non-U.S. government debt securities	6,954		1		(16		)	6,939
Total	$	129,512	$	14	$	(269	)	$	129,257

The following tables present the gross unrealized losses and the fair value for those marketable investments that were in an unrealized loss position for less than twelve months as of June 30, 2016 and December 31, 2015 (in thousands):

	June 30, 2016
	Fair Value		Gross Unrealized Losses
U.S. States and Municipalities	2,022		—
Corporate bonds	8,174		(2		)
Non-U.S. government debt securities	1,836		(4		)
Total	$	12,032	$	(6	)

	December 31, 2015
	Fair Value		Gross Unrealized Losses
Commercial paper	$	4,746	$	(1	)
U.S. Treasury	12,453		(27		)
U.S. agency securities	13,475		(34		)
U.S. states and municipalities	2,084		(2		)
Corporate bonds	59,163		(189		)
Non-U.S. government debt securities	5,881		(16		)
Total	$	97,802	$	(269	)

As of June 30, 2016 and December 31, 2015, there were no securities that had been in a loss position for more than twelve months.

The contractual maturities of the Company’s marketable investments as of June 30, 2016 and December 31, 2015 were as follows (in thousands):

	June 30, 2016		December 31, 2015
	Fair Value
Due in one year	$	105,284	$	62,983
Due in one to five years	20,665		66,274
Total	$	125,949	$	129,257

Inventories

Inventories are stated at the lower of cost (determined under the first-in first-out method) or market. Inventory quantities are reviewed in consideration of actual loss experience, projected future demand and remaining shelf life to record a provision for excess and obsolete inventory when appropriate.

The components of inventories as of June 30, 2016 and December 31, 2015 consisted of the following (in thousands):

	June 30, 2016		December 31, 2015
Raw materials	$	10,560	$	9,176
Work in process	3,175		2,746
Finished goods	54,671		44,839
Inventories	$	68,406	$	56,761

Property and Equipment, Net

Property and equipment, net as of June 30, 2016 and December 31, 2015 consisted of the following (in thousands):

	June 30, 2016			December 31, 2015
Machinery and equipment	$	9,366		$	8,559
Furniture and fixtures	2,808			2,091
Leasehold improvements	2,360			1,564
Software	1,003			666
Computers	671			565
Construction in progress	1,857			577
Total property and equipment	18,065			14,022
Less: Accumulated depreciation and amortization	(6,201		)	(5,071		)
Property and equipment, net	$	11,864		$	8,951

Depreciation and amortization expense was $0.6 million and $0.4 million for the three months ended June 30, 2016 and 2015, respectively, and was $1.1 million and $0.7 million for the six months ended June 30, 2016 and 2015, respectively.

Accrued Liabilities

The following table shows the components of accrued liabilities as of June 30, 2016 and December 31, 2015 (in thousands):

	June 30, 2016		December 31, 2015
Payroll and employee-related expenses	$	15,401	$	13,653
Sales return reserve	3,040		3,247
Preclinical and clinical trial cost	1,769		1,330
Deferred revenue	411		526
Product warranty	735		713
Sales tax payable	497		531
Income tax payable	139		308
Other accrued liabilities	6,127		5,273
Total accrued liabilities	$	28,119	$	25,581

The estimated product warranty accrual as of June 30, 2016 and December 31, 2015 was as follows (in thousands):

	June 30, 2016			December 31, 2015
Balance at the beginning of the period	$	713		$	314
Provision for product warranty	345			752
Settlements of product warranty claims	(323		)	(353		)
Balance at the end of the period	$	735		$	713

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Lease Commitments

The Company leases its offices and other equipment under non-cancelable operating leases that expire at various dates from 2029 to 2031. Rent expense for non-cancelable operating leases with scheduled rent increases is recognized on a straight-line basis over the lease term. Rent expense for the three months ended June 30, 2016 and 2015 was $1.3 million and $0.8 million, respectively and for the six months ended June 30, 2016 and 2015 was $2.4 million and $1.4 million, respectively. In addition, the Company's lease commitments also require it to make additional payments during the lease term for taxes, insurance and other operating expenses.

Royalty Obligations

In March 2005, the Company entered into a license agreement that requires the Company to make minimum royalty payments to the licensor on a quarterly basis. As of both June 30, 2016 and December 31, 2015, the license agreement required minimum annual royalty payments of $0.1 million in equal quarterly installments. On each January 1, the quarterly calendar year minimum royalty will be adjusted to equal the prior year’s minimum royalty adjusted by a percentage equal to the percentage change in the “consumer price index for all urban consumers” for the prior calendar year as reported by the U.S. Department of Labor. Unless terminated earlier, the term of the license agreement will continue until the expiration of the last to expire patent that covers that licensed product or 2022, whichever is longer.

In April 2012, the Company entered into an agreement that requires the Company to pay, on a quarterly basis, a 5% royalty on sales of products covered under applicable patents. Unless the agreement is terminated earlier, the royalty term for each applicable product will continue until the expirations of the applicable patent covering such product or 2029, whichever is longer.

In November 2013, the Company entered into an agreement that requires the Company to pay, on a quarterly basis, a 3% royalty on the first $5 million in sales and a 1% royalty on sales thereafter of products covered under applicable patents. Unless the agreement is terminated earlier, the royalty for each covered product shall continue until 2030.

In April 2015, the Company entered into a royalty agreement that requires the Company to pay, on a quarterly basis, a 2% royalty on sales of certain products covered by the agreement. Unless the royalty agreement is terminated earlier, the royalty term for each covered product shall continue until 2035.

Royalty expense included in cost of sales for the three months ended June 30, 2016 and 2015 was $0.7 million and $0.4 million, respectively and for the six months ended June 30, 2016 and 2015 was $1.4 million and $0.8 million, respectively.

Contingencies

From time to time, the Company may have certain contingent liabilities that arise in the ordinary course of business. The Company accrues a liability for such matters when it is probable that future expenditures will be made and such expenditures can be reasonably estimated.

Indemnification

The Company enters into standard indemnification arrangements in the ordinary course of business. In many such arrangements, the Company agrees to indemnify, hold harmless, and reimburse the indemnified parties for losses suffered or incurred by the indemnified parties in connection with any trade secret, copyright, patent or other intellectual property infringement claim by any third-party with respect to the Company’s technology. The term of these indemnification agreements is generally perpetual. The maximum potential amount of future payments the Company could be required to make under these agreements is not determinable because it involves claims that may be made against the Company in the future, but have not yet been made.

The Company has entered into indemnification agreements with its directors and officers that may require the Company to indemnify its directors and officers against liabilities that may arise by reason of their status or service as directors or officers, other than liabilities arising from willful misconduct of the individual.

The Company has not incurred costs to defend lawsuits or settle claims related to these indemnification agreements.

No liability associated with any of these indemnification requirements has been recorded to date.

Litigation

The Company was contacted in 2015 by the attorney for a potential product liability claimant who allegedly suffered injuries as a result of an aneurysm procedure in which the Penumbra Coil 400 was used. On February 19, 2016, a complaint for damages was filed on behalf of this claimant against the Company and the hospital involved in the procedure (Montgomery v. Penumbra, Inc., et al., Case No. 16-2-04050-1 SEA, Superior Court of the State of Washington, King County). The suit alleges liability primarily under the Washington Product Liability Act and seeks both compensatory and punitive damages without a specific damages claim. Counsel for the claimant previously indicated that he expects that a jury could award $35 million in damages were this matter to go to trial. This amount is substantially in excess of the Company’s insurance coverage. The hospital defendant had requested indemnification from the Company but was dismissed from the case in July 2016. As formal discovery has only recently commenced, the Company is unable to assess the merits of the plaintiff’s case. The Company intends to vigorously defend the litigation, as the Company believes there will be substantial questions regarding causation, liability and damages.

From time to time, the Company is subject to claims and assessments in the ordinary course of business. The Company is not currently a party to any litigation matter that, individually or in the aggregate, is expected to have a material adverse effect on the Company’s business, financial condition, results of operations or cash flows.

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Stock-based Compensation

6 Months Ended

Jun. 30, 2016

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

Stock-based Compensation

Stock-Based Compensation

Stock Options

Activity of stock options under the Penumbra, Inc. 2005 Stock Plan, the Penumbra, Inc. 2011 Equity Incentive Plan and the Amended and Restated Penumbra, Inc. 2014 Equity Incentive Plan (collectively “the Plans”) during the six months ended June 30, 2016 is set forth below:

	Number of Shares		Weighted- Average Exercise Price
Balance at December 31, 2015	3,755,345		$	12.13
Options exercised	(253,555	)	5.80
Options canceled	(11,983	)	19.13
Balance at June 30, 2016	3,489,807		12.56

Restricted Stock and Restricted Stock Units

The following table summarizes the activity of unvested restricted stock and restricted stock units under the Plans during the six months ended June 30, 2016 is set forth below:

	Number of Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2015	849,571		$	15.12
Granted	132,800		46.30
Vested	(128,675	)	14.38
Canceled/Forfeited	(5,000	)	7.75
Unvested and expected to vest at June 30, 2016	848,696		20.16

Employee Stock Purchase Plan

Under the Penumbra, Inc. Employee Stock Purchase Plan (“ESPP”), employees purchased 148,354 shares for $3.8 million during each of the three and six months ended June 30, 2016.

Stock-based Compensation

The following table sets forth the stock-based compensation expense included in the condensed consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Cost of sales	$	651	$	71	$	660	$	130
Research and development	281		160		539		182
Sales, general and administrative	2,590		3,030		5,338		3,304
Total	$	3,522	$	3,261	$	6,537	$	3,616

As of June 30, 2016, total unrecognized compensation cost was $27.6 million related to unvested share-based compensation arrangements which is expected to be recognized over a weighted average period of 2.7 years.

The total stock-based compensation cost capitalized in inventory was $0.6 million and $0.3 million as of June 30, 2016 and December 31, 2015, respectively.

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Accumulated Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

Other comprehensive income (loss) consists of two components: unrealized gains or losses on the Company’s available-for-sale marketable investments, and gains or losses from foreign currency translation adjustments. Until realized and reported as a component of net income, these comprehensive income items accumulate and are included within accumulated other comprehensive income (loss). Unrealized gains and losses on the Company’s marketable investments are reclassified from accumulated other comprehensive income (loss) into earnings when realized upon sale, and are determined based on specific identification of securities sold. Gains and losses from the translation of assets and liabilities denominated in non-U.S. dollar functional currencies are included in accumulated other comprehensive income (loss).

The following table summarizes the changes in the accumulated balances during the three and six months ended June 30, 2016 and 2015, and includes information regarding the manner in which the reclassifications out of accumulated other comprehensive income (loss) into earnings affect the Company’s condensed consolidated statements of operations and comprehensive income (loss) (in thousands):

	Three Months Ended June 30, 2016									Three Months Ended June 30, 2015
	Marketable Investments			Currency Translation Adjustments			Total			Marketable Investments			Currency Translation Adjustments			Total
Balance at beginning of the period	$	118		$	(904	)	$	(786	)	$	(193	)	$	(1,560	)	$	(1,753	)
Other comprehensive income before reclassifications:
Unrealized gains (losses)—marketable investments	138			—			138			(179		)	—			(179		)
Foreign currency translation gains (losses)	—			(1,875		)	(1,875		)	—			347			347
Income tax effect—benefit (expense)	(49		)	(6		)	(55		)	44			(20		)	24
Net of tax	89			(1,881		)	(1,792		)	(135		)	327			192
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	(2		)	—			(2		)	511			—			511
Income tax effect—benefit (expense)	1			—			1			(183		)	—			(183		)
Net of tax	(1		)	—			(1		)	328			—			328
Net current-year other comprehensive income (loss)	88			(1,881		)	(1,793		)	193			327			520
Balance at end of the period	$	206		$	(2,785	)	$	(2,579	)	$	—		$	(1,233	)	$	(1,233	)

	Six Months Ended June 30, 2016									Six Months Ended June 30, 2015
	Marketable Investments			Currency Translation Adjustments			Total			Marketable Investments			Currency Translation Adjustments			Total
Balance at beginning of the period	$	(163	)	$	(1,952	)	$	(2,115	)	$	(220	)	$	(644	)	$	(864	)
Other comprehensive income before reclassifications:
Unrealized gains (losses)—marketable investments	580			—			580			(162		)	—			(162		)
Foreign currency translation gains (losses)	—			(832		)	(832		)	—			(681		)	(681		)
Income tax effect—benefit (expense)	(209		)	(1		)	(210		)	36			92			128
Net of tax	371			(833		)	(462		)	(126		)	(589		)	(715		)
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	(3		)	—			(3		)	541			—			541
Income tax effect—benefit	1			—			1			(195		)	—			(195		)
Net of tax	(2		)	—			(2		)	346			—			346
Net current-year other comprehensive income (loss)	369			(833		)	(464		)	220			(589		)	(369		)
Balance at end of the period	$	206		$	(2,785	)	$	(2,579	)	$	—		$	(1,233	)	$	(1,233	)

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Income Taxes

6 Months Ended

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The Company’s income tax expense, deferred tax assets and liabilities, and reserves for unrecognized tax benefits reflect management’s best assessment of estimated current and future taxes to be paid. The Company is subject to income taxes in both the United States and foreign jurisdictions. Significant judgments and estimates are required in determining the consolidated income tax expense. The interim period effective tax rate is based on a forecast of the Company’s full year results.

The Company’s effective tax rate increased to 148.3% for the three months ended June 30, 2016, compared to 36.1% for the three months ended June 30, 2015 primarily attributable to forecasted income and losses. The effective tax rate decreased to 44.5% for the six months ended June 30, 2016, compared to 364.1% for the six months ended June 30, 2015 primarily attributable to forecasted income and losses.

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Net Income per Share of Common Stock attributable to Common Stockholders

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Net Income per Share of Common Stock attributable to Common Stockholders

Net Income per Share of Common Stock attributable to Common Stockholders

The Company calculated its basic and diluted net income per share attributable to common stockholders for the three and six months ended June 30, 2015 in conformity with the two-class method required for companies with participating securities. Under the two-class method, the Company determined whether it had net income attributable to common stockholders, which included the results of operations less current period preferred stock non-cumulative dividends. If it was determined that the Company did have net income attributable to common stockholders during a period, the related undistributed earnings were then allocated between common stock and the preferred stock based on the weighted average number of shares outstanding during the period to determine the numerator for the basic net income per share attributable to common stockholders. In computing diluted net income attributable to common stockholders, undistributed earnings were re-allocated to reflect the potential impact of dilutive securities to determine the numerator for the diluted net income per share attributable to common stockholders.

The Company’s basic net income per share attributable to common stockholders is calculated by dividing the net income by the weighted average number of shares of common stock outstanding for the period. The diluted net income per share attributable to common stockholders is computed by giving effect to all potential dilutive common stock equivalents outstanding for the period. For purposes of this calculation, options to purchase common stock, restricted stock and common stock warrants are considered common stock equivalents.

A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net income per share attributable to common stockholders for the three and six months ended June 30, 2016 and 2015 is as follows (in thousands, except share and per share amounts):

	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015			2016		2015
Net income per share:
Numerator
Net income (Loss)	$	185	$	(2,671	)	$	965	$	(169	)
Less: Undistributed income attributable to preferred stockholders	—		2,118			—		135
Net income (Loss) attributable to common stockholders—basic and diluted	$	185	$	(553	)	$	965	$	(34	)
Denominator
Weighted average shares used to compute net income attributable to common stockholders —Basic	30,210,322		5,096,151			30,100,162		5,000,375
Potential dilutive options and ESPP shares, as calculated using treasury stock method	2,088,651		—			2,074,286		—
Potential dilutive restricted stock and restricted stock units, as calculated using treasury stock method	394,711		—			367,805		—
Weighted average shares used to compute net income attributable to common stockholders —Diluted	32,693,684		5,096,151			32,542,253		5,000,375
Net income (Loss) per share attributable to common stockholders —Basic	$	0.01	$	(0.11	)	$	0.03	$	(0.01	)
—Diluted	$	0.01	$	(0.11	)	$	0.03	$	(0.01	)

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net income per share of common stock for the periods presented, because the effect of including them would have been anti-dilutive: 

	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Options and ESPP to purchase common stock	—	2,485,392	4,007	2,485,392
Restricted stock and restricted stock units	15,210	755,771	34,928	755,771
Total	15,210	3,241,163	38,935	3,241,163

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Geographic Areas and Product Sales

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Geographic Areas and Product Sales

Geographic Areas and Product Sales

The Company’s revenue by geographic area, based on the destination to which the Company ships its products, for the three and six months ended June 30, 2016 and 2015 was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
United States	$	43,692	$	27,619	$	83,104	$	53,970
Japan	6,570		4,152		12,730		8,610
Other International	14,844		10,540		27,191		18,683
Total	$	65,106	$	42,311	$	123,025	$	81,263

The following table sets forth revenue by product category (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Neuro	$	45,362	$	34,400	$	86,646	$	66,054
Peripheral Vascular	19,744		7,911		36,379		15,209
Total	$	65,106	$	42,311	$	123,025	$	81,263

The Company does not have significant long-lived assets outside the U.S.

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2016

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation and Consolidation

The accompanying condensed consolidated balance sheet as of June 30, 2016, the condensed consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015, and the condensed consolidated statements of cash flows for the six months ended June 30, 2016 and 2015 are unaudited. The unaudited condensed consolidated financial statements included herein have been prepared by the Company in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and the applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) for interim financial information. Accordingly, they do not include all of the information and notes required by U.S. GAAP for complete financial statements. The condensed consolidated balance sheet as of December 31, 2015 was derived from the audited financial statements as of that date, but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements.

 The unaudited condensed consolidated financial statements have been prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments of a normal recurring nature considered necessary to state fairly the Company’s financial position as of June 30, 2016, the results of its operations for the three and six months ended June 30, 2016 and 2015, and the cash flows for the six months ended June 30, 2016 and 2015. The results for the three and six months ended June 30, 2016 are not necessarily indicative of the results that may be expected for the year ending December 31, 2016 or for any other future annual or interim period.

The information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited consolidated financial statements and notes thereto for the year ended December 31, 2015 included in the Company’s Annual Report on Form 10-K. There have been no changes to the Company’s significant accounting policies during the six months ended June 30, 2016, as compared to the significant accounting policies described in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated.

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and equity accounts; disclosure of contingent assets and liabilities at the date of the financial statements; and the reported amounts of revenues and expenses during the reporting period. On an ongoing basis, the Company evaluates its estimates, including those related to marketable investments, provisions for doubtful accounts, sales return reserve, warranty reserves, valuation of inventories, useful lives of property and equipment, income taxes, and contingencies, among others. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other data. Actual results could differ from those estimates.

Segments

Segments

The Company determined its operating segment on the same basis that it uses to evaluate its performance internally. The Company has one business activity: the design, development, manufacturing and marketing of innovative medical devices, and operates as one operating segment. The Company’s chief operating decision-maker, its Chief Executive Officer, reviews its operating results for the purpose of allocating resources and evaluating financial performance. The Company determines revenue by geographic area, based on the destination to which it ships its products.

Recently Issued Accounting Standards

Recently Issued Accounting Standards

In May 2014, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers, which outlines a comprehensive new revenue recognition model designed to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In March 2016, the FASB issued ASU 2016-08, Revenue from Contracts with Customers—Principal versus Agent Considerations (Reporting Revenue Gross versus Net),which further clarifies the implementation guidance on principal versus agent considerations contained in ASU 2014-09. In April 2016, the FASB issued ASU 2016-10, Revenue from Contracts with Customers—Identifying Performance Obligations and Licensing, which further clarifies the implementation guidance relating to identifying performance obligations and the licensing implementation guidance. In May 2016, the FASB issued ASU 2016-12, Revenue from Contracts with Customers—Narrow-Scope improvements and Practical Expedients, which further clarifies the implementation on narrow scope improvements and practical expedients. These standards will be effective for the Company in the first quarter of 2018 pursuant to ASU No. 2015-14, Revenue from Contracts with Customers-Deferral of the Effective Date,issued by the FASB in August 2015. The Company is currently evaluating the impact of adopting these standards.

In July 2015, the FASB issued ASU No. 2015-11, Simplifying the Measurement of Inventory, which requires an entity to measure most inventory at the lower of cost and net realizable value, thereby simplifying the current guidance under which an entity must measure inventory at the lower of cost or market. The accounting standard is effective prospectively for annual periods beginning after December 15, 2016, and interim periods therein. Early adoption is permitted as of the beginning of an interim or annual reporting period. The Company is currently evaluating the impact of adopting this standard.

In January 2016, the FASB issued ASU 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities, which addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments. The new standard is effective for annual periods and interim periods beginning after December 15, 2017 and, upon adoption, an entity should apply the amendments by means of a cumulative-effect adjustment to the balance sheet at the beginning of the first reporting period in which the guidance is effective. Early adoption is not permitted except for the provision to record fair value changes for financial liabilities under the fair value option resulting from instrument-specific credit risk in other comprehensive income. The Company is currently evaluating the impact of adopting this standard.

In February 2016, the FASB issued ASU 2016-02, Leases, which amends the existing accounting standards for leases. Under the new guidance, a lessee will be required to recognize a lease liability and right-of-use asset for all leases with terms in excess of twelve months. The new guidance also modifies the classification criteria and accounting for sales-type and direct financing leases, and requires additional disclosures to enable users of financial statements to understand the amount, timing, and uncertainty of cash flows arising from leases. Consistent with current guidance, a lessee’s recognition, measurement, and presentation of expenses and cash flows arising from a lease will continue to depend primarily on its classification. The accounting standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and must be applied using a modified retrospective approach. Early adoption is permitted. The Company is currently evaluating the impact of adopting this standard.

In March 2016, the FASB issued ASU No. 2016-09, Stock Compensation—Improvements to Employee Share-Based Payment Accounting, which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The accounting standard is effective for annual periods beginning after December 15, 2016, including interim periods within those annual periods. Early adoption is permitted in any interim or annual period. The Company is currently evaluating the impact of adopting this standard.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses. The standard changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The Company will recognize an allowance for credit losses on available-for-sale securities rather than deductions in amortized cost. The standard is effective for fiscal years and interim periods beginning after December 15, 2019. Early adoption is permitted for all periods beginning after December 15, 2018. The Company is currently evaluating the impact of adopting this standard.

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Fair Value of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2016

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Assets and Liabilities

The following table sets forth the Company’s financial assets and liabilities measured at fair value by level within the fair value hierarchy (in thousands):

	As of June 30, 2016
	Level 1		Level 2		Level 3		Fair Value
Financial Assets
Cash equivalents:
Money market funds	$	279	$	—	$	—	$	279
Marketable investments:
Commercial paper	—		10,134		—		10,134
U.S. Treasury	15,512				—		15,512
U.S. agency securities	—		13,521		—		13,521
U.S. states and municipalities	—		15,938		—		15,938
Corporate bonds	—		65,081		—		65,081
Non-U.S. government debt securities	—		5,763		—		5,763
Total	$	15,791	$	110,437	$	—	$	126,228

	As of December 31, 2015
	Level 1		Level 2		Level 3		Fair Value
Financial Assets
Cash equivalents:
Commercial paper	$	—	$	9,850	$	—	$	9,850
Money market funds	252		—		—		252
Marketable investments:
Commercial paper	—		22,332		—		22,332
U.S. Treasury	15,436		—		—		15,436
U.S. agency securities	—		21,464		—		21,464
U.S. states and municipalities	—		2,084		—		2,084
Corporate bonds	—		61,002		—		61,002
Non-U.S. government debt securities	—		6,939		—		6,939
Total	$	15,688	$	123,671	$	—	$	139,359

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Balance Sheet Components (Tables)

6 Months Ended

Jun. 30, 2016

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Allowance for Doubtful Accounts

The Company’s allowance for doubtful accounts comprised of the following (in thousands):

Allowance for Doubtful Accounts	June 30, 2016		December 31, 2015
Balance at the beginning of the period	$	589	$	602
Charged to costs and expenses	72		(13		)
Deductions	—		—
Balance at the end of the period	$	661	$	589

Schedule of Prepaid Expenses and Other Current Assets

The Company’s prepaid expenses and other current assets as of June 30, 2016 and December 31, 2015 were comprised of the following (in thousands):

	June 30, 2016		December 31, 2015
Prepaid Tax	$	6,892	$	2,736
Prepaid expenses	4,753		4,706
Income tax receivable	3,273		606
Other current assets	2,488		1,304
Prepaid expenses and other current assets	$	17,406	$	9,352

Schedule of Marketable Investments

The Company’s marketable investments as of June 30, 2016 and December 31, 2015 were as follows (in thousands):

	June 30, 2016
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial paper	$	10,128	$	6	$	—		$	10,134
U.S. Treasury	15,478		34		—			15,512
U.S. agency securities	13,487		34		—			13,521
U.S. states and municipalities	15,927		11		—			15,938
Corporate bonds	64,847		236		(2		)	65,081
Non-U.S. government debt securities	5,762		5		(4		)	5,763
Total	$	125,629	$	326	$	(6	)	$	125,949

	December 31, 2015
	Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Commercial paper	$	22,328	$	5	$	(1	)	$	22,332
U.S. Treasury	15,459		4		(27		)	15,436
U.S. agency securities	21,497		1		(34		)	21,464
U.S. states and municipalities	2,086		—		(2		)	2,084
Corporate bonds	61,188		3		(189		)	61,002
Non-U.S. government debt securities	6,954		1		(16		)	6,939
Total	$	129,512	$	14	$	(269	)	$	129,257

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value

The following tables present the gross unrealized losses and the fair value for those marketable investments that were in an unrealized loss position for less than twelve months as of June 30, 2016 and December 31, 2015 (in thousands):

	June 30, 2016
	Fair Value		Gross Unrealized Losses
U.S. States and Municipalities	2,022		—
Corporate bonds	8,174		(2		)
Non-U.S. government debt securities	1,836		(4		)
Total	$	12,032	$	(6	)

	December 31, 2015
	Fair Value		Gross Unrealized Losses
Commercial paper	$	4,746	$	(1	)
U.S. Treasury	12,453		(27		)
U.S. agency securities	13,475		(34		)
U.S. states and municipalities	2,084		(2		)
Corporate bonds	59,163		(189		)
Non-U.S. government debt securities	5,881		(16		)
Total	$	97,802	$	(269	)

Schedule of Contractual Maturities of Marketable Investments

The contractual maturities of the Company’s marketable investments as of June 30, 2016 and December 31, 2015 were as follows (in thousands):

	June 30, 2016		December 31, 2015
	Fair Value
Due in one year	$	105,284	$	62,983
Due in one to five years	20,665		66,274
Total	$	125,949	$	129,257

Schedule of Inventories

The components of inventories as of June 30, 2016 and December 31, 2015 consisted of the following (in thousands):

	June 30, 2016		December 31, 2015
Raw materials	$	10,560	$	9,176
Work in process	3,175		2,746
Finished goods	54,671		44,839
Inventories	$	68,406	$	56,761

Schedule of Property and Equipment, Net

Property and equipment, net as of June 30, 2016 and December 31, 2015 consisted of the following (in thousands):

	June 30, 2016			December 31, 2015
Machinery and equipment	$	9,366		$	8,559
Furniture and fixtures	2,808			2,091
Leasehold improvements	2,360			1,564
Software	1,003			666
Computers	671			565
Construction in progress	1,857			577
Total property and equipment	18,065			14,022
Less: Accumulated depreciation and amortization	(6,201		)	(5,071		)
Property and equipment, net	$	11,864		$	8,951

Schedule of Accrued Liabilities

The following table shows the components of accrued liabilities as of June 30, 2016 and December 31, 2015 (in thousands):

	June 30, 2016		December 31, 2015
Payroll and employee-related expenses	$	15,401	$	13,653
Sales return reserve	3,040		3,247
Preclinical and clinical trial cost	1,769		1,330
Deferred revenue	411		526
Product warranty	735		713
Sales tax payable	497		531
Income tax payable	139		308
Other accrued liabilities	6,127		5,273
Total accrued liabilities	$	28,119	$	25,581

Schedule of Estimated Product Warranty Accrual

The estimated product warranty accrual as of June 30, 2016 and December 31, 2015 was as follows (in thousands):

	June 30, 2016			December 31, 2015
Balance at the beginning of the period	$	713		$	314
Provision for product warranty	345			752
Settlements of product warranty claims	(323		)	(353		)
Balance at the end of the period	$	735		$	713

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Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

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

Summary of Stock Option Activity

Activity of stock options under the Penumbra, Inc. 2005 Stock Plan, the Penumbra, Inc. 2011 Equity Incentive Plan and the Amended and Restated Penumbra, Inc. 2014 Equity Incentive Plan (collectively “the Plans”) during the six months ended June 30, 2016 is set forth below:

	Number of Shares		Weighted- Average Exercise Price
Balance at December 31, 2015	3,755,345		$	12.13
Options exercised	(253,555	)	5.80
Options canceled	(11,983	)	19.13
Balance at June 30, 2016	3,489,807		12.56

Summary of Unvested Restricted Stock and Restricted Stock Unit Activity

The following table summarizes the activity of unvested restricted stock and restricted stock units under the Plans during the six months ended June 30, 2016 is set forth below:

	Number of Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2015	849,571		$	15.12
Granted	132,800		46.30
Vested	(128,675	)	14.38
Canceled/Forfeited	(5,000	)	7.75
Unvested and expected to vest at June 30, 2016	848,696		20.16

Schedule of Stock-based Compensation Expense

The following table sets forth the stock-based compensation expense included in the condensed consolidated statements of operations and comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015 (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Cost of sales	$	651	$	71	$	660	$	130
Research and development	281		160		539		182
Sales, general and administrative	2,590		3,030		5,338		3,304
Total	$	3,522	$	3,261	$	6,537	$	3,616

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Accumulated Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2016

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following table summarizes the changes in the accumulated balances during the three and six months ended June 30, 2016 and 2015, and includes information regarding the manner in which the reclassifications out of accumulated other comprehensive income (loss) into earnings affect the Company’s condensed consolidated statements of operations and comprehensive income (loss) (in thousands):

	Three Months Ended June 30, 2016									Three Months Ended June 30, 2015
	Marketable Investments			Currency Translation Adjustments			Total			Marketable Investments			Currency Translation Adjustments			Total
Balance at beginning of the period	$	118		$	(904	)	$	(786	)	$	(193	)	$	(1,560	)	$	(1,753	)
Other comprehensive income before reclassifications:
Unrealized gains (losses)—marketable investments	138			—			138			(179		)	—			(179		)
Foreign currency translation gains (losses)	—			(1,875		)	(1,875		)	—			347			347
Income tax effect—benefit (expense)	(49		)	(6		)	(55		)	44			(20		)	24
Net of tax	89			(1,881		)	(1,792		)	(135		)	327			192
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	(2		)	—			(2		)	511			—			511
Income tax effect—benefit (expense)	1			—			1			(183		)	—			(183		)
Net of tax	(1		)	—			(1		)	328			—			328
Net current-year other comprehensive income (loss)	88			(1,881		)	(1,793		)	193			327			520
Balance at end of the period	$	206		$	(2,785	)	$	(2,579	)	$	—		$	(1,233	)	$	(1,233	)

	Six Months Ended June 30, 2016									Six Months Ended June 30, 2015
	Marketable Investments			Currency Translation Adjustments			Total			Marketable Investments			Currency Translation Adjustments			Total
Balance at beginning of the period	$	(163	)	$	(1,952	)	$	(2,115	)	$	(220	)	$	(644	)	$	(864	)
Other comprehensive income before reclassifications:
Unrealized gains (losses)—marketable investments	580			—			580			(162		)	—			(162		)
Foreign currency translation gains (losses)	—			(832		)	(832		)	—			(681		)	(681		)
Income tax effect—benefit (expense)	(209		)	(1		)	(210		)	36			92			128
Net of tax	371			(833		)	(462		)	(126		)	(589		)	(715		)
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	(3		)	—			(3		)	541			—			541
Income tax effect—benefit	1			—			1			(195		)	—			(195		)
Net of tax	(2		)	—			(2		)	346			—			346
Net current-year other comprehensive income (loss)	369			(833		)	(464		)	220			(589		)	(369		)
Balance at end of the period	$	206		$	(2,785	)	$	(2,579	)	$	—		$	(1,233	)	$	(1,233	)

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Net Income per Share of Common Stock attributable to Common Stockholders (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Reconciliation of the Numerator and Denominator used in the Calculation of the Basic and Diluted Earnings per Share

A reconciliation of the numerator and denominator used in the calculation of the basic and diluted net income per share attributable to common stockholders for the three and six months ended June 30, 2016 and 2015 is as follows (in thousands, except share and per share amounts):

	Three Months Ended June 30,					Six Months Ended June 30,
	2016		2015			2016		2015
Net income per share:
Numerator
Net income (Loss)	$	185	$	(2,671	)	$	965	$	(169	)
Less: Undistributed income attributable to preferred stockholders	—		2,118			—		135
Net income (Loss) attributable to common stockholders—basic and diluted	$	185	$	(553	)	$	965	$	(34	)
Denominator
Weighted average shares used to compute net income attributable to common stockholders —Basic	30,210,322		5,096,151			30,100,162		5,000,375
Potential dilutive options and ESPP shares, as calculated using treasury stock method	2,088,651		—			2,074,286		—
Potential dilutive restricted stock and restricted stock units, as calculated using treasury stock method	394,711		—			367,805		—
Weighted average shares used to compute net income attributable to common stockholders —Diluted	32,693,684		5,096,151			32,542,253		5,000,375
Net income (Loss) per share attributable to common stockholders —Basic	$	0.01	$	(0.11	)	$	0.03	$	(0.01	)
—Diluted	$	0.01	$	(0.11	)	$	0.03	$	(0.01	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings per Share

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net income per share of common stock for the periods presented, because the effect of including them would have been anti-dilutive: 

	Three Months Ended June 30,		Six Months Ended June 30,
	2016	2015	2016	2015
Options and ESPP to purchase common stock	—	2,485,392	4,007	2,485,392
Restricted stock and restricted stock units	15,210	755,771	34,928	755,771
Total	15,210	3,241,163	38,935	3,241,163

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Geographic Areas and Product Sales (Tables)

6 Months Ended

Jun. 30, 2016

Segment Reporting [Abstract]

Revenue by Geographic Area

The Company’s revenue by geographic area, based on the destination to which the Company ships its products, for the three and six months ended June 30, 2016 and 2015 was as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
United States	$	43,692	$	27,619	$	83,104	$	53,970
Japan	6,570		4,152		12,730		8,610
Other International	14,844		10,540		27,191		18,683
Total	$	65,106	$	42,311	$	123,025	$	81,263

Revenue by Product Category

The following table sets forth revenue by product category (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Neuro	$	45,362	$	34,400	$	86,646	$	66,054
Peripheral Vascular	19,744		7,911		36,379		15,209
Total	$	65,106	$	42,311	$	123,025	$	81,263

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Organization and Description of Business (Details)	6 Months Ended
	Jun. 30, 2016 market
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of major markets	2

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Summary of Significant Accounting Policies - Additional Disclosures (Details)	6 Months Ended
	Jun. 30, 2016 segment activity
Accounting Policies [Abstract]
Number of business activities | activity	1
Number of operating segments | segment	1

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Fair Value of Financial Instruments (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Financial Assets
Total	$ 126,228	$ 139,359
Commercial paper
Financial Assets
Marketable investments	10,134	22,332
U.S. Treasury
Financial Assets
Marketable investments	15,512	15,436
U.S. agency securities
Financial Assets
Marketable investments	13,521	21,464
U.S. states and municipalities
Financial Assets
Marketable investments	15,938	2,084
Corporate bonds
Financial Assets
Marketable investments	65,081	61,002
Non-U.S. government debt securities
Financial Assets
Marketable investments	5,763	6,939
Commercial paper
Financial Assets
Cash equivalents		9,850
Money market funds
Financial Assets
Cash equivalents	279	252
Level 1
Financial Assets
Total	15,791	15,688
Level 1 | Commercial paper
Financial Assets
Marketable investments	0	0
Level 1 | U.S. Treasury
Financial Assets
Marketable investments	15,512	15,436
Level 1 | U.S. agency securities
Financial Assets
Marketable investments	0	0
Level 1 | U.S. states and municipalities
Financial Assets
Marketable investments	0	0
Level 1 | Corporate bonds
Financial Assets
Marketable investments	0	0
Level 1 | Non-U.S. government debt securities
Financial Assets
Marketable investments	0	0
Level 1 | Commercial paper
Financial Assets
Cash equivalents		0
Level 1 | Money market funds
Financial Assets
Cash equivalents	279	252
Level 2
Financial Assets
Total	110,437	123,671
Level 2 | Commercial paper
Financial Assets
Marketable investments	10,134	22,332
Level 2 | U.S. Treasury
Financial Assets
Marketable investments		0
Level 2 | U.S. agency securities
Financial Assets
Marketable investments	13,521	21,464
Level 2 | U.S. states and municipalities
Financial Assets
Marketable investments	15,938	2,084
Level 2 | Corporate bonds
Financial Assets
Marketable investments	65,081	61,002
Level 2 | Non-U.S. government debt securities
Financial Assets
Marketable investments	5,763	6,939
Level 2 | Commercial paper
Financial Assets
Cash equivalents		9,850
Level 2 | Money market funds
Financial Assets
Cash equivalents	0	0
Level 3
Financial Assets
Total	0	0
Level 3 | Commercial paper
Financial Assets
Marketable investments	0	0
Level 3 | U.S. Treasury
Financial Assets
Marketable investments	0	0
Level 3 | U.S. agency securities
Financial Assets
Marketable investments	0	0
Level 3 | U.S. states and municipalities
Financial Assets
Marketable investments	0	0
Level 3 | Corporate bonds
Financial Assets
Marketable investments	0	0
Level 3 | Non-U.S. government debt securities
Financial Assets
Marketable investments	0	0
Level 3 | Commercial paper
Financial Assets
Cash equivalents		0
Level 3 | Money market funds
Financial Assets
Cash equivalents	$ 0	$ 0

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Balance Sheet Components Cash and Cash Equivalents Narrative (Details) - United States $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($) financial_instituion	Dec. 31, 2015 USD ($)
Concentration Risk [Line Items]
Number of financial institutions holding cash in excess of federally insured limits | financial_instituion	1
Cash, uninsured amount | $	$ 2.7	$ 1.9

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Balance Sheet Components - Accounts Receivable, Net (Details) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at Beginning of Period	$ 589	$ 602	$ 602
Charged to Costs and Expenses	72	$ (101)	(13)
Deductions	0		0
Balance at End of Period	$ 661		$ 589

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Balance Sheet Components - Accounts Receivable Narrative (Details) - Customer Concentration Risk - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, number of customers that accounted for greater than a specified benchmark	0		0		0
Concentration risk, percentage			10.00%		10.00%
One Major Customer | Sales Revenue, Net
Concentration Risk [Line Items]
Concentration risk, number of customers that accounted for greater than a specified benchmark	1	1	1	1
Concentration risk, percentage	10.00%	10.00%	10.00%	10.00%

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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid Tax	$ 6,892	$ 2,736
Prepaid expenses	4,753	4,706
Income tax receivable	3,273	606
Other current assets	2,488	1,304
Prepaid expenses and other current assets	$ 17,406	$ 9,352

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Balance Sheet Components - Gains and Losses of Marketable Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 125,629	$ 129,512
Gross Unrealized Gains	326	14
Gross Unrealized Losses	(6)	(269)
Fair Value	125,949	129,257
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cost	10,128	22,328
Gross Unrealized Gains	6	5
Gross Unrealized Losses	0	(1)
Fair Value	10,134	22,332
U.S. Treasury
Schedule of Available-for-sale Securities [Line Items]
Cost	15,478	15,459
Gross Unrealized Gains	34	4
Gross Unrealized Losses	0	(27)
Fair Value	15,512	15,436
U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Cost	13,487	21,497
Gross Unrealized Gains	34	1
Gross Unrealized Losses	0	(34)
Fair Value	13,521	21,464
U.S. states and municipalities
Schedule of Available-for-sale Securities [Line Items]
Cost	15,927	2,086
Gross Unrealized Gains	11	0
Gross Unrealized Losses	0	(2)
Fair Value	15,938	2,084
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Cost	64,847	61,188
Gross Unrealized Gains	236	3
Gross Unrealized Losses	(2)	(189)
Fair Value	65,081	61,002
Non-U.S. government debt securities
Schedule of Available-for-sale Securities [Line Items]
Cost	5,762	6,954
Gross Unrealized Gains	5	1
Gross Unrealized Losses	(4)	(16)
Fair Value	$ 5,763	$ 6,939

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Balance Sheet Components - Marketable Securities in an Unrealized Loss Position (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Fair Value	$ 12,032,000	$ 97,802,000
Gross Unrealized Losses, less than 12 months	(6,000)	(269,000)
Gross Unrealized losses, greater than 12 months	0	0
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Fair Value		4,746,000
Gross Unrealized Losses, less than 12 months		(1,000)
U.S. Treasury
Schedule of Available-for-sale Securities [Line Items]
Fair Value		12,453,000
Gross Unrealized Losses, less than 12 months		(27,000)
U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value		13,475,000
Gross Unrealized Losses, less than 12 months		(34,000)
U.S. states and municipalities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	2,022,000	2,084,000
Gross Unrealized Losses, less than 12 months	0	(2,000)
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Fair Value	8,174,000	59,163,000
Gross Unrealized Losses, less than 12 months	(2,000)	(189,000)
Non-U.S. government debt securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value	1,836,000	5,881,000
Gross Unrealized Losses, less than 12 months	$ (4,000)	$ (16,000)

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Balance Sheet Components - Contractual Maturities of Marketable Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Due in one year	$ 105,284	$ 62,983
Due in one to five years	20,665	66,274
Total	$ 125,949	$ 129,257

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Balance Sheet Components - Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 10,560	$ 9,176
Work in process	3,175	2,746
Finished goods	54,671	44,839
Inventories	$ 68,406	$ 56,761

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Balance Sheet Components - Property and Equipment, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 18,065		$ 18,065		$ 14,022
Less: Accumulated depreciation and amortization	(6,201)		(6,201)		(5,071)
Property and equipment, net	11,864		11,864		8,951
Depreciation and amortization expense	600	$ 400	1,146	$ 745
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property and equipment	9,366		9,366		8,559
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property and equipment	2,808		2,808		2,091
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property and equipment	2,360		2,360		1,564
Software
Property, Plant and Equipment [Line Items]
Total property and equipment	1,003		1,003		666
Computers
Property, Plant and Equipment [Line Items]
Total property and equipment	671		671		565
Construction in progress
Property, Plant and Equipment [Line Items]
Total property and equipment	$ 1,857		$ 1,857		$ 577

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Balance Sheet Components - Accrued Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Payroll and employee-related expenses	$ 15,401	$ 13,653
Sales return reserve	3,040	3,247
Preclinical and clinical trial cost	1,769	1,330
Deferred revenue	411	526
Product warranty	735	713
Sales tax payable	497	531
Income tax payable	139	308
Other accrued liabilities	6,127	5,273
Total accrued liabilities	$ 28,119	$ 25,581

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Balance Sheet Components - Product Warranty (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Product Warranty, Increase (Decrease) [Roll Forward]
Balance at the beginning of the period	$ 713	$ 314
Provision for product warranty	345	752
Settlements of product warranty claims	(323)	(353)
Balance at the end of the period	$ 735	$ 713

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Commitments and Contingencies - Lease and Purchase Commitments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$ 1.3	$ 0.8	$ 2.4	$ 1.4

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Commitments and Contingencies - Royalty Obligations (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Cost of Sales
Other Commitments [Line Items]
Royalty expense	$ 700,000	$ 400,000	$ 1,400,000	$ 800,000
Royalty Agreement, March 2005
Other Commitments [Line Items]
Minimum annual royalty payments	$ 100,000		$ 100,000		$ 100,000
Royalty Agreement, April 2012
Other Commitments [Line Items]
Royalty as a percent of sales			5.00%
Royalty Agreement, November 2013, Less than $5 Million in Sales
Other Commitments [Line Items]
Royalty as a percent of sales			3.00%
Royalty Agreement, November 2013, Greater than $5 Million in Sales
Other Commitments [Line Items]
Royalty as a percent of sales			1.00%
Royalty threshold			$ 5,000,000
Royalty Agreement, April 2015
Other Commitments [Line Items]
Royalty as a percent of sales			2.00%

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Commitments and Contingencies - Litigation (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Damages from Product
Loss Contingencies [Line Items]
Damages sought, value	$ 35

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Stock-based Compensation - Stock Option Activity (Details)	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Number of Shares
Beginning balance (in shares) | shares	3,755,345
Options exercised (in shares) | shares	(253,555)
Options cancelled (in shares) | shares	(11,983)
Ending balance (in shares) | shares	3,489,807
Weighted- Average Exercise Price
Beginning balance (in dollars per share) | $ / shares	$ 12.13
Options exercised (in dollars per share) | $ / shares	5.80
Options cancelled (in dollars per share) | $ / shares	19.13
Ending balance (in dollars per share) | $ / shares	$ 12.56

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Stock-based Compensation - Restricted Stock and Restricted Stock Units Activity (Details) - Restricted stock and restricted stock units	6 Months Ended
	Jun. 30, 2016 $ / shares shares
Number of Shares
Unvested beginning balance (in shares) | shares	849,571
Granted (in shares) | shares	132,800
Vested (in shares) | shares	(128,675)
Canceled/Forfeited (in shares) | shares	(5,000)
Unvested and expected to vest ending balance (in shares) | shares	848,696
Weighted Average Grant Date Fair Value
Unvested beginning balance (in dollars per share) | $ / shares	$ 15.12
Granted (in dollars per share) | $ / shares	46.30
Vested (in dollars per share) | $ / shares	14.38
Canceled/Forfeited (in dollars per share) | $ / shares	7.75
Unvested and expected to vest ending balance (in dollars per share) | $ / shares	$ 20.16

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Stock-based Compensation - Employee Stock Purchase Plan (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Shares purchased under employee stock purchase plan (in shares)	148,354	148,354
Shares purchased under employee stock purchase plan (in shares)	$ 3.8	$ 3.8

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Stock-based Compensation - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 3,522	$ 3,261	$ 6,537	$ 3,616
Unrecognized compensation cost related to unvested share-based compensation arrangements	27,600		$ 27,600
Unrecognized compensation cost, expected recognition period			2 years 8 months
Share-based compensation expense, capitalized in inventory			$ 600		$ 300
Cost of sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	651	71	660	130
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	281	160	539	182
Sales, general and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 2,590	$ 3,030	$ 5,338	$ 3,304

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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			$ 232,522
Amounts reclassified from accumulated other comprehensive income to earnings:
Ending balance	$ 247,591		247,591
Marketable Investments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	118	$ (193)	(163)	$ (220)
Other comprehensive income before reclassifications:
Other comprehensive income before reclassifications	138	(179)	580	(162)
Income tax effect—benefit (expense)	(49)	44	(209)	36
Net of tax	89	(135)	371	(126)
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	(2)	511	(3)	541
Income tax effect—benefit (expense)	1	(183)	1	(195)
Net of tax	(1)	328	(2)	346
Net current-year other comprehensive income (loss)	88	193	369	220
Ending balance	206	0	206	0
Currency Translation Adjustments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(904)	(1,560)	(1,952)	(644)
Other comprehensive income before reclassifications:
Other comprehensive income before reclassifications	(1,875)	347	(832)	(681)
Income tax effect—benefit (expense)	(6)	(20)	(1)	92
Net of tax	(1,881)	327	(833)	(589)
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	0	0	0	0
Income tax effect—benefit (expense)	0	0	0	0
Net of tax	0	0	0	0
Net current-year other comprehensive income (loss)	(1,881)	327	(833)	(589)
Ending balance	(2,785)	(1,233)	(2,785)	(1,233)
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(786)	(1,753)	(2,115)	(864)
Other comprehensive income before reclassifications:
Income tax effect—benefit (expense)	(55)	24	(210)	128
Net of tax	(1,792)	192	(462)	(715)
Amounts reclassified from accumulated other comprehensive income to earnings:
Realized (gains) losses—marketable investments	(2)	511	(3)	541
Income tax effect—benefit (expense)	1	(183)	1	(195)
Net of tax	(1)	328	(2)	346
Net current-year other comprehensive income (loss)	(1,793)	520	(464)	(369)
Ending balance	$ (2,579)	$ (1,233)	$ (2,579)	$ (1,233)

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Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Effective tax rate	148.30%	36.10%	44.50%	364.10%

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Net Income per Share of Common Stock attributable to Common Stockholders - Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator
Net income (loss)	$ 185	$ (2,671)	$ 965	$ (169)
Less: Undistributed income attributable to preferred stockholders-basic	0	2,118	0	135
Less: Undistributed income attributable to preferred stockholders-diluted	0	2,118	0	135
Net income (Loss) attributable to common stockholders-basic	185	(553)	965	(34)
Net income (Loss) attributable to common stockholders-diluted	$ 185	$ (553)	$ 965	$ (34)
Denominator
Weighted average shares used to compute net income per share attributable to common stockholders — Basic (in shares)	30,210,322	5,096,151	30,100,162	5,000,375
Weighted average shares used to compute net income attributable to common stockholders —Diluted (in shares)	32,693,684	5,096,151	32,542,253	5,000,375
Net income (loss) per share attributable to common stockholders — Basic (in dollars per share)	$ 0.01	$ (0.11)	$ 0.03	$ (0.01)
Net income (loss) per share attributable to common stockholders — Diluted (in dollars per share)	$ 0.01	$ (0.11)	$ 0.03	$ (0.01)
Employee Stock Options and ESPP Shares
Denominator
Potential dilutive shares as calculated using treasury stock method (in shares)	2,088,651	0	2,074,286	0
Restricted stock and restricted stock units
Denominator
Potential dilutive shares as calculated using treasury stock method (in shares)	394,711	0	367,805	0

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Net Income per Share of Common Stock attributable to Common Stockholders - Antidilutive Securities (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of earnings per share (in shares)	15,210	3,241,163	38,935	3,241,163
Options and ESPP to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of earnings per share (in shares)	0	2,485,392	4,007	2,485,392
Restricted stock and restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from the computation of earnings per share (in shares)	15,210	755,771	34,928	755,771

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Geographic Areas and Product Sales - Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 65,106	$ 42,311	$ 123,025	$ 81,263
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	43,692	27,619	83,104	53,970
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	6,570	4,152	12,730	8,610
Other International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 14,844	$ 10,540	$ 27,191	$ 18,683

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Geographic Areas and Product Sales - Revenue by Product Category (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue from External Customer [Line Items]
Revenue	$ 65,106	$ 42,311	$ 123,025	$ 81,263
Neuro
Revenue from External Customer [Line Items]
Revenue	45,362	34,400	86,646	66,054
Peripheral Vascular
Revenue from External Customer [Line Items]
Revenue	$ 19,744	$ 7,911	$ 36,379	$ 15,209