10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

_____________________________________________

FORM 10-Q

_____________________________________________

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

For the quarterly period ended September 30, 2015

or

☐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 000-51470

_____________________________________________

AtriCure, Inc.

(Exact name of Registrant as specified in its charter)

_____________________________________________

Delaware	34-1940305
(State or other jurisdiction of incorporation)	(IRS Employer Identification No.)

6217 Centre Park Drive

West Chester, OH 45069

(Address of principal executive offices)

(513) 755-4100

(Registrant’s telephone number, including area code)

(Former name, former address and former fiscal year, if changed since last report)

_____________________________________________

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 ☒ NO ☐

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

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

Large Accelerated Filer	☐	Accelerated Filer	☒
Non-Accelerated Filer	☐ (Do not check if a smaller reporting company)	Smaller reporting company	☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act): YES ☐ NO ☒

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	Outstanding at October 28, 2015
Common Stock, $.001 par value	32,216,424

Table of Contents

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements
	Condensed Consolidated Balance Sheets as of September 30, 2015 and December 31, 2014	3
	Condensed Consolidated Statements of Operations and Comprehensive Loss for the Three Months and Nine Months Ended September 30, 2015 and 2014	4
	Condensed Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2015 and 2014	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 Disclosures About Market Risk	25
Item 4.	Controls and Procedures	25
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	25
Item 1A.	Risk Factors	25
Item 6.	Exhibits	26
Signatures		27
Exhibit Index		28

2

PART I. FINANCIAL INFORMATION

Item 1.  Financial Statements

ATRICURE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(In Thousands, Except Per Share Amounts)

(Unaudited)

	September 30,		December 31,
	2015		2014
Assets
Current assets:
Cash and cash equivalents	$	28,714	$	28,384
Short-term investments		19,712		31,265
Accounts receivable, less allowance for doubtful accounts of $125 and $68, respectively		16,643		17,558
Inventories		16,567		14,257
Other current assets		2,477		2,044
Total current assets		84,113		93,508
Property and equipment, net		27,455		11,552
Long-term investments		10,381		8,894
Intangible assets, net		7,970		8,878
Goodwill		35,386		35,386
Other noncurrent assets		337		186
Total Assets	$	165,642	$	158,404
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable	$	11,174	$	7,621
Accrued liabilities		14,320		14,041
Other current liabilities and current maturities of capital leases		13,571		3,981
Total current liabilities		39,065		25,643
Capital leases		68		74
Other noncurrent liabilities		1,025		149
Total Liabilities		40,158		25,866
Commitments and contingencies (Note 7)
Stockholders’ Equity:
Common stock, $0.001 par value, 90,000 shares authorized and 28,446 and 27,580issued and outstanding, respectively		28		28
Additional paid-in capital		280,668		271,282
Accumulated other comprehensive loss		(490)		(348)
Accumulated deficit		(154,722)		(138,424)
Total Stockholders’ Equity		125,484		132,538
Total Liabilities and Stockholders’ Equity	$	165,642	$	158,404

See accompanying notes to condensed consolidated financial statements.

3

ATRICURE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(In Thousands, Except Per Share Amounts)

(Unaudited)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Revenue	$	31,423	$	26,678	$	93,892	$	78,039
Cost of revenue		8,945		7,786		26,562		22,709
Gross profit		22,478		18,892		67,330		55,330
Operating expenses:
Research and development expenses		6,504		5,033		17,975		13,603
Selling, general and administrative expenses		22,101		14,662		65,445		53,308
Total operating expenses		28,605		19,695		83,420		66,911
Loss from operations		(6,127)		(803)		(16,090)		(11,581)
Other income (expense):
Interest expense		(16)		(24)		(51)		(290)
Interest income		56		27		142		64
Other		(48)		338		(279)		976
Loss before income tax expense		(6,135)		(462)		(16,278)		(10,831)
Income tax expense		6		4		20		36
Net loss	$	(6,141)	$	(466)	$	(16,298)	$	(10,867)
Basic and diluted net loss per share	$	(0.22)	$	(0.02)	$	(0.60)	$	(0.42)
Weighted average shares outstanding—basic and diluted		27,462		26,915		27,190		26,185
Comprehensive loss:
Unrealized gains (losses) on investments	$	17	$	(20)	$	56	$	(33)
Foreign currency translation adjustment		36		(390)		(198)		(416)
Other comprehensive income (loss)		53		(410)		(142)		(449)
Net loss		(6,141)		(466)		(16,298)		(10,867)
Comprehensive loss	$	(6,088)	$	(876)	$	(16,440)	$	(11,316)

See accompanying notes to condensed consolidated financial statements.

4

ATRICURE, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In  Thousands)

(Unaudited)

	Nine Months Ended
	September 30,
	2015		2014
Cash flows from operating activities:
Net loss	$	(16,298)	$	(10,867)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense		6,533		5,704
Depreciation		3,304		2,405
Amortization of intangible assets		908		1,066
Amortization of deferred financing costs		46		99
Loss on disposal of property and equipment		83		11
Realized loss from foreign exchange on intercompany transactions		333		—
Amortization/accretion on investments		472		322
Change in allowance for doubtful accounts		55		73
Change in value of contingent consideration		—		(8,032)
Other		—		95
Changes in operating assets and liabilities:
Accounts receivable		571		(1,785)
Inventories		(2,461)		(4,555)
Other current assets		(449)		833
Accounts payable		2,181		(539)
Accrued liabilities		557		(3,604)
Other noncurrent assets and liabilities		403		(813)
Net cash used in operating activities		(3,762)		(19,587)
Cash flows from investing activities:
Purchases of available-for-sale securities		(19,525)		(31,412)
Sales and maturities of available-for-sale securities		29,174		14,614
Purchases of property and equipment		(8,287)		(4,389)
Increases in property under build-to-suit obligation		(9,128)		—
Net cash used in investing activities		(7,766)		(21,187)
Cash flows from financing activities:
Proceeds from sale of stock, net of offering costs of $0 and $257, respectively		—		65,830
Payments on debt and capital leases		(36)		(6,362)
Increases in build-to-suit obligation		9,128		—
Proceeds from tax incentive loan		340
Payment of debt fees and premium on retirement of debt		(62)		(181)
Proceeds from stock option exercises		2,421		1,657
Shares repurchased for payment of taxes on stock awards		(650)		(198)
Proceeds from issuance of common stock under employee stock purchase plan		906		708
Net cash provided by financing activities		12,047		61,454
Effect of exchange rate changes on cash and cash equivalents		(189)		(46)
Net increase in cash and cash equivalents		330		20,634
Cash and cash equivalents—beginning of period		28,384		14,892
Cash and cash equivalents—end of period	$	28,714	$	35,526
Supplemental cash flow information:
Cash paid for interest	$	4	$	113
Cash paid for taxes		20		146
Non-cash investing and financing activities:
Accrued purchases of property and equipment		2,442		2,572
Assets acquired through capital lease		50		8

See accompanying notes to condensed consolidated financial statements.

5

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

1. DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of the Business— AtriCure, Inc. was incorporated in the State of Delaware on October 31, 2000. The “Company” or “AtriCure” consists of AtriCure, Inc. and its wholly-owned subsidiaries. The Company is aninnovator in surgical treatments for atrial fibrillation (Afib) and left atrial appendage management (LAAM). The Company sells its products to medical centers globally through a direct sales force and distributors.

Basis of Presentation—The accompanying interim financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (SEC). The accompanying interim financial statements are unaudited, but in the opinion of the Company’s management, contain all of the normal, recurring adjustments considered necessary to present fairly the financial position, results of operations and cash flows for the periods presented in conformity with accounting principles generally accepted in the United States of America (GAAP) applicable to interim periods. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with GAAP have been omitted or condensed. The Company believes the disclosures herein are adequate to make the information presented not misleading. Results of operations are not necessarily indicative of the results expected for the full fiscal year or for any future period.

The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the audited financial statements of the Company included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 filed with the SEC.

Principles of Consolidation—The Condensed Consolidated Financial Statements include the accounts of the Company, AtriCure, LLC, the Company’s wholly-owned subsidiary organized in the State of Delaware, Endoscopic Technologies, LLC, the Company’s wholly-owned subsidiary organized in the State of Delaware, and AtriCure Europe B.V. (AtriCure Europe), the Company’s wholly-owned subsidiary incorporated in the Netherlands. All intercompany accounts and transactions have been eliminated in consolidation.

Cash and Cash Equivalents—The Company considers highly liquid investments with maturities of three months or less at the date of acquisition as cash equivalents.

Investments—The Company places its investments primarily in U.S. Government agencies and securities, corporate bonds and commercial paper. The Company classifies all investments as available-for-sale. Investments with maturities of less than one year are classified as short-term investments. Investments are recorded at fair value, with unrealized gains and losses recorded as accumulated other comprehensive income (loss). The Company recognizes gains and losses when these securities are sold using the specific identification method and includes them in interest income or expense in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

Revenue Recognition—The Company accounts for revenue in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 605, “Revenue Recognition” (ASC 605). The Company recognizes revenue when all of the following criteria are met: (i) there is persuasive evidence that an arrangement exists; (ii) delivery of the products and/or services has occurred; (iii) the selling price is fixed or determinable; and (iv) collectability is reasonably assured.

Pursuant to the Company’s standard terms of sale, revenue is recognized when title to the goods and risk of loss transfers to customers and there are no remaining obligations that will affect the customers’ final acceptance of the sale. Generally, the Company’s standard terms of sale define the transfer of title and risk of loss to occur upon shipment to the respective customer. The Company generally does not maintain any post-shipping obligations to the recipients of the products. No installation, calibration or testing of products is performed by the Company subsequent to shipment to the customer in order to render it operational.

Revenue includes shipping and handling revenue of $260 and $236 for the three months ended September 30, 2015 and 2014, respectively, and $778 and $699 for the nine months ended September 30, 2015 and 2014, respectively. Cost of freight for shipments made to customers is included in cost of revenue. Sales and other value-added taxes collected from customers and remitted to governmental authorities are excluded from revenue. The Company sells its products primarily through a direct sales force, with certain international markets sold through distributors. Terms of sale are generally consistent for both end-users and distributors except that payment terms are generally net 30 days for end-users and net 60 days for distributors.

Sales Returns and Allowances—The Company maintains a provision for sales returns and allowances to account for potential returns of defective or damaged products, products shipped in error and invoice adjustments. The Company estimates such provision quarterly based primarily on a specific identification basis, in addition to estimating a general reserve. Increases to the provision result in a reduction of revenue. The provision is included in accrued liabilities in the Condensed Consolidated Balance Sheets.

6

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

Allowance for Doubtful Accounts Receivable—The Company evaluates the collectability of accounts receivable in order to determine the appropriate reserve for doubtful accounts. In determining the amount of the reserve, the Company considers aging of account balances, historical credit losses, customer-specific information and other relevant factors. An increase to the allowance for doubtful accounts results in a corresponding increase in expense. The Company reviews accounts receivable and adjusts the allowance based on current circumstances and charges off uncollectible receivables against the allowance when all attempts to collect the receivable have failed. The Company’s history of write-offs against the allowance has not been significant.

Inventories—Inventories are stated at the lower of cost or market using approximate costs based on the first-in, first-out cost method (FIFO) and consist of raw materials, work in process and finished goods. The Company’s industry is characterized by rapid product development and frequent new product introductions. Uncertain timing of product approvals, variability in product launch strategies and variation in product utilization all impact excess and obsolete inventory. An inventory allowance based on product usage is estimated and recorded quarterly for excess, slow moving and obsolete inventory, as well as inventory with a carrying value in excess of its net realizable value. Write-offs are recorded when a product is destroyed. The Company’s history of write-offs against the allowance has not been significant.

Inventories consist of the following:

	September 30,		December 31,
	2015		2014
Raw materials	$	5,371	$	4,429
Work in process		1,013		1,397
Finished goods		10,183		8,431
Inventories	$	16,567	$	14,257

Property and Equipment—Property and equipment is stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method of depreciation for financial reporting purposes and applied over the estimated useful lives of the assets. The estimated useful life by major asset category is the following: generators and other capital equipment, machinery, equipment and vehicles is three to seven years, computer and other office equipment is three years, furniture and fixtures is three to seven years and leasehold improvements and equipment leased under a capital lease are the shorter of their useful life or remaining lease term. The Company reassesses the useful lives of property and equipment annually, and assets are retired if they are no longer in service. Maintenance and repair costs are expensed as incurred.

Generators and other capital equipment (such as the Company’s switchbox units and cryosurgical consoles) are loaned at no cost to direct customers that use the Company’s disposable products. Depreciation of such assets is included in cost of revenue. The estimated useful lives of this equipment are based on anticipated usage by customers and the timing and impact of expected new technology rollouts by the Company. To the extent the Company experiences changes in the usage of this equipment or introduces new technologies, the estimated useful lives of the equipment may change in a future period. Depreciation related to these generators was $733 and $593 for the three months ended September 30, 2015 and 2014, respectively, and $2,026 and $1,552 for the nine months ended September 30, 2015 and 2014, respectively. As of September 30, 2015 and December 31, 2014, the net carrying amount of loaned equipment included in net property and equipment in the Condensed Consolidated Balance Sheets was $5,237 and $4,141, respectively.

The Company reviews property and equipment for impairment using its best estimates based on reasonable and supportable assumptions and projections.

Intangible Assets—Intangible assets with determinable useful lives are amortized on a straight-line basis over the estimated periods benefited. The Company reviews intangible assets for impairment using its best estimates based on reasonable and supportable assumptions and projections.

Goodwill— Goodwill represents the excess of purchase price over the fair value of the net assets acquired in business combinations. The Company tests goodwill for impairment annually on November 30, or more often if impairment indicators are present. The Company’s goodwill is accounted for in a single reporting unit representing the Company as a whole.

Other Current Liabilities and Current Maturities of Capital Leases—Other current liabilities consist of a financing obligation related to the construction of the Company’s new headquarters (see Note 7 – Commitments and Contingencies). Current maturities of capital leases consist of capital lease obligations with maturities of less than one year (see Note 6 – Indebtedness).

7

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

Other Income—Other income consists primarily of foreign currency transaction gains and losses, grant income and non-employee option gains and losses related to the fair market value change for fully vested options outstanding for consultants which are accounted for as free-standing derivatives.

The Company recorded net foreign currency transaction gains (losses) of $(48) and ($51) for the three months ended September 30, 2015 and 2014, respectively, and $(257) and ($30) for the nine months ended September 30, 2015 and 2014, respectively, in connection with settlements of its intercompany balance with AtriCure Europe and invoices transacted in British Pounds.

The Company periodically is awarded grants to support research and development activities or education activities. The Company recognizes grant income when the funds are earned. The Company recorded grant income of $0 and $231 during the three months ended September 30, 2015 and 2014, respectively. Grant income of $35 and $731 was recorded for the nine months ended September 30, 2015 and 2014, respectively.

The Company historically issued stock options to non-employee consultants as a form of compensation for services provided to the Company. Because the non-employee options require settlement by the Company’s delivery of registered shares and because the tax withholding provisions in the awards allow the options to be partially net-cash settled, these options, when vested, are no longer eligible for equity classification and are, thus, subsequently accounted for as derivative liabilities under FASB ASC 815, “Derivatives and Hedging” (ASC 815) until the awards are ultimately either exercised or forfeited. Accordingly, the vested non-employee options are classified as liabilities and remeasured at fair value through earnings at each reporting period. All vested non-employee options have been exercised as of September 30, 2015. During the three months ended September 30, 2015 and 2014, $0 and $158, respectively, of income was recorded as a result of the remeasurement of the fair value of these fully vested stock options. During the nine months ended September 30, 2015 and 2014, $(57) and $275, respectively, of (expense) income was recorded as a result of the remeasurement of the fair value of these fully vested stock options.

Taxes— Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rates is recognized in the period that includes the enactment date.

The Company’s estimate of the valuation allowance for deferred tax assets requires it to make significant estimates and judgments about its future operating results. Deferred tax assets are reduced by valuation allowances if, based on the consideration of all available evidence, it is more-likely-than-not that some portion of the deferred tax asset will not be realized. Significant weight is given to evidence that can be objectively verified. The Company evaluates deferred tax assets on a quarterly basis to determine if valuation allowances are required by considering all available evidence. Deferred tax assets are realized by having sufficient future taxable income to allow the related tax benefits to reduce taxes otherwise payable. The sources of taxable income that may be available to realize the benefit of deferred tax assets are future reversals of existing taxable temporary differences, future taxable income, exclusive of reversing temporary differences and carryforwards, taxable income in carry-back years and tax planning strategies that are both prudent and feasible. In evaluating whether to record a valuation allowance, the applicable accounting standards deem that the existence of cumulative losses in recent years is a significant piece of objectively verifiable negative evidence that must be overcome by objectively verifiable positive evidence to avoid the need to record a valuation allowance. The Company has recorded a full valuation allowance against its net deferred tax assets as it is more-likely-than-not that the benefit of the deferred tax assets will not be recognized in future periods.

A provision of The Patient Protection and Affordable Care Act enacted in 2010, as amended (Affordable Care Act), requires manufacturers of medical devices to pay an excise tax on all U.S. medical device sales. The Company’s expense related to the medical device excise tax, which was recorded in cost of revenue, was $164 and $204 for the three months ended September 30, 2015 and 2014, respectively, and $468 and $434 for the nine months ended September 30, 2015 and 2014, respectively.

Net Loss Per Share—Basic and diluted net loss per share is computed in accordance with FASB ASC 260, “Earnings Per Share” (ASC 260) by dividing the net loss by the weighted average number of common shares outstanding during the period. Since the Company has experienced net losses for all periods presented, net loss per share excludes the effect of 4,243 and 3,782 options and restricted stock shares as of September 30, 2015 and 2014, respectively, because they are anti-dilutive. Therefore the number of shares calculated for basic net loss per share is also used for the diluted net loss per share calculation.

Comprehensive Loss and Accumulated Other Comprehensive Loss—In addition to net losses, the comprehensive loss includes foreign currency translation adjustments and unrealized gains and losses on investments.

8

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

Accumulated other comprehensive income (loss) consisted of the following:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Total accumulated other comprehensive (loss) income at   beginning of period	$	(543)	$	(178)	$	(348)	$	(139)
Unrealized Gains on Investments
Balance at beginning of period	$	(15)	$	(19)	$	(54)	$	(6)
Other comprehensive income (loss) before reclassifications		17		(20)		56		(33)
Amounts reclassified from accumulated other comprehensive   income to other income on the statement of operations		—		—		—		—
Balance at end of period	$	2	$	(39)	$	2	$	(39)
Foreign Currency Translation Adjustment
Balance at beginning of period	$	(528)	$	(159)	$	(294)	$	(133)
Other comprehensive income (loss) before reclassifications		67		(339)		135		(386)
Amounts reclassified from accumulated other comprehensive   income to other income on the statement of operations		(31)		(51)		(333)		(30)
Balance at end of period	$	(492)	$	(549)	$	(492)	$	(549)
Total accumulated other comprehensive loss at end of period	$	(490)	$	(588)	$	(490)	$	(588)

Research and Development—Research and development costs are expensed as incurred. These costs include compensation and other internal and external costs associated with the development and research related to new and existing products or concepts, preclinical studies, clinical trials, healthcare compliance and regulatory affairs.

Advertising Costs— The Company expenses advertising costs as incurred. Advertising costs were not significant during the three and nine months ended September 30, 2015 and 2014.

Share-Based Compensation—The Company follows FASB ASC 718, “Compensation-Stock Compensation” (ASC 718) to record share-based compensation for all employee share-based payment awards, including stock options, restricted stock, performance shares and stock purchases related to an employee stock purchase plan, based on estimated fair values. The Company’s share-based compensation expense recognized under ASC 718 for the three months ended September 30, 2015 and 2014 was $2,392 and $1,716, respectively, and $6,533 and $5,704 for the nine months ended September 30, 2015 and 2014, respectively, on a before and after tax basis.

FASB ASC 718 requires companies to estimate the fair value of share-based payment awards on the date of grant using an option-pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service periods in the Company’s Condensed Consolidated Statement of Operations and Comprehensive Loss. The expense has been reduced for estimated forfeitures. FASB ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

The Company estimates the fair value of time-based options on the date of grant using the Black-Scholes option-pricing model (Black-Scholes model). The Company’s determination of fair value of share-based payment awards on the date of grant using an option-pricing model is affected by the Company’s stock price, as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility over the term of the awards and actual and projected employee stock option exercise behaviors. The fair value of market-based performance option grants is estimated at the date of grant using a Monte-Carlo simulation. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service periods in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

The Company estimates the fair value of restricted stock based upon the grant date closing market price of the Company’s common stock. The Company’s determination of fair value is affected by the Company’s stock price as well as assumptions regarding the number of shares expected to be granted.

The Company also has an employee stock purchase plan (ESPP or the Plan) which is available to all eligible employees as defined by the Plan. Under the ESPP, shares of the Company’s common stock may be purchased at a discount. The Company

9

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

estimates the number of shares to be purchased under the Plan and records compensation expense based upon the fair value of the stock at the beginning of the purchase period using the Black-Scholes model.

Use of Estimates—The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.

Fair Value Disclosures—The Company classifies and records cash and investments in U.S. government agencies and securities as Level 1 within the fair value hierarchy. Accounts receivable, short-term other assets, accounts payable and accrued liabilities are also classified as Level 1. The carrying amounts of these assets and liabilities approximate their fair value due to their relatively short-term nature. Cash equivalents and investments in commercial paper are classified as Level 2 within the fair value hierarchy (see Note 3 – Fair Value for further information). Significant unobservable inputs with respect to the fair value measurement of the Level 3 non-employee stock options are developed using Company data. When an input is changed, the Black-Scholes model is updated and the results are analyzed for reasonableness.

2. RECENT ACCOUNTING PRONOUNCEMENTS

In May 2014 the FASB issued a final standard on revenue from contracts with customers. The standard, issued as FASB ASU 2014-09, “Revenue from Contracts with Customers” (ASU 2014-09), outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance. In July 2015 the FASB decided to defer the effective date of ASU 2014-09 for entities reporting under U.S. GAAP from interim and annual reporting periods beginning after December 15, 2016 to interim and annual reporting periods beginning after December 15, 2017 and allow early adoption as of the original effective date. A full retrospective or modified retrospective approach may be taken to adopt the guidance in the ASU. The Company is evaluating the impact of the provisions of ASU 2014-09 on its consolidated financial position, results of operations and related disclosures.

In 2015 the FASB issued ASU 2015-10, “Technical Corrections and Improvements” (ASU 2015-10), which amends a wide range of topics in the FASB Accounting Standards Codification. The amendments make minor corrections or minor improvements to the Codification. The amendments in ASU 2015-10 that require transition guidance are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted, including adoption in an interim period. All other amendments are effective upon the issuance of ASU 2015-10. The Company has reviewed the amendments in ASU 2015-10 and has determined that the new guidance does not have a material impact on the Company’s financial reporting.

In July 2015 the FASB issued ASU 2015-11, “Simplifying the Measurement of Inventory” (ASU 2015-11), which requires entities 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. ASU 2015-11 is effective prospectively for annual periods beginning after December 15, 2016 and interim periods therein. Early application is permitted. The Company is reviewing the provisions of ASU 2015-11 and expects that the new guidance will not have a material impact on the Company’s financial reporting.

In August 2015 the FASB issued ASU 2015-15, “Interest – Imputation of Interest” (ASU 2015-15), which clarifies the Security and Exchange Commission staff’s position on presenting and measuring debt issuance costs incurred in connection with line-of-credit arrangements given the lack of guidance on this topic in ASU 2015-03. ASU 2015-15 was effective upon issuance. The Company has determined that the new guidance does not have a material impact on its financial reporting.

In September 2015 the FASB issued ASU 2015-16, “Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments” (ASU 2015-16), which simplifies the accounting for measurement-period adjustments. Under ASU 2015-16, an acquirer must recognize adjustments to provisional amounts that are identifiedduring the measurement period in the reporting period in which the adjustment amounts aredetermined. ASU 2015-16 also requires acquirers to present separately on the face of the income statement,or disclose in the notes, the portion of the amount recorded in current-period earnings by line item thatwould have been recorded in previous reporting periods if the adjustment to the provisional amountshad been recognized as of the acquisition date. ASU 2015-16 is effective for fiscal years beginning after December15, 2015, including interim periods within those fiscal years, and must be applied prospectively to adjustments to provisionalamounts that occur after the effective date. Early adoption is permitted for financial statements thathave not been issued. The Company will consider the new guidance in its accounting and financial reporting for acquisitions.

10

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

3. FAIR VALUE

FASB ASC 820, “Fair Value Measurements and Disclosures” (ASC 820) defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value which are the following:

· Level 1—Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. An active market for the asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. The valuation under this approach does not entail a significant degree of judgment.

· Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; 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. The valuation technique for the Company’s Level 2 assets is based on quoted market prices for similar assets from observable pricing sources at the reporting date.

· 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. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. The fair value of the Company’s Level 3 instruments are estimated on the grant date using the Black-Scholes model and they are revalued at the end of each reporting period using the Black-Scholes model. The fair value of the Company’s Level 3 contingent consideration was estimated on the acquisition date of Endoscopic Technologies, Inc. and was revalued at the end of each subsequent reporting period.

In accordance with ASC 820, the following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2015:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	—	$	22,918	$	—	$	22,918
U.S. government agencies and securities		1,615		—		—		1,615
Corporate bonds		—		28,478		—		28,478
Total assets	$	1,615	$	51,396	$	—	$	53,011

There were no changes in the levels or methodology of measurement of financial assets and liabilities during the three or nine month periods ended September 30, 2015.

11

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

In accordance with ASC 820, the following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2014:

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	—	$	23,692	$	—	$	23,692
Commercial paper		—		1,800		—		1,800
U.S. government agencies and securities		3,022		—		—		3,022
Corporate bonds		—		35,337		—		35,337
Total assets	$	3,022	$	60,829	$	—	$	63,851
Liabilities:
Derivative instruments	$	—	$	—	$	120	$	120
Acquisition-related contingent consideration		—		—		—		—
Total liabilities	$	—	$	—	$	120	$	120

There were no changes in the levels or methodology of measurement of financial assets and liabilities during the twelve months ended December 31, 2014.

Derivative Instruments. Vested non-employee options historically issued by the Company were accounted for as derivative liabilities and remeasured at fair value through earnings at each reporting period until exercised or forfeited. All vested non-employee options have been exercised as of September 30, 2015.

In accordance with ASC 820, the following table represents the Company’s Level 3 fair value measurements using significant other unobservable inputs for derivative instruments as of September 30, 2015:

Beginning Balance – January 1, 2015	$	120
Total losses included in earnings		57
Exercises		(177)
Reclassification from equity to liability when fully vested		—
Ending Balance – September 30, 2015	$	—

In accordance with ASC 820, the following table represents the Company’s Level 3 fair value measurements using significant other unobservable inputs for derivative instruments as of December 31, 2014:

Beginning Balance – January 1, 2014	$	350
Total gains included in earnings		(183)
Exercises		(47)
Reclassification from equity to liability when fully vested		—
Ending Balance – December 31, 2014	$	120

Acquisition-Related Contingent Consideration. The Company acquired Endoscopic Technologies, Inc. (Estech) on December 31, 2013. The aggregate consideration paid to Estech shareholders includes up to $26,000 of contingent consideration to be paid based on the achievement of certain performance-based milestones in 2014 and 2015. The fair value of the contingent consideration was estimated using an expected present value approach to estimate an expected value, which, in statistical terms, is the weighted average of a discrete random variable’s possible values with the respective probabilities as the weights. This fair value measurement is based on significant inputs not observable in the market and thus represents a Level 3 measurement within the fair value hierarchy. Using this valuation technique, the fair value of the contingent consideration was determined to be $0 as of both September 30, 2015 and December 31, 2014.

12

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

The following table represents the Company’s Level 3 fair value measurements using significant other unobservable inputs for acquisition-related contingent consideration as of December 31, 2014: 

Beginning Balance – January 1, 2014	$	8,032
Amounts acquired		—
Transfers in (out) of Level 3		—
Changes in fair value included in earnings		(8,032)
Ending Balance – December 31, 2014	$	—

4. INTANGIBLE ASSETS

The following table provides a summary of the Company’s intangible assets with definite lives:

	September 30,				December 31,
	2015				2014
	Cost		Accumulated Amortization		Cost		Accumulated Amortization
Non-compete agreement	$	100	$	100	$	100	$	93
Fusion technology		9,242		1,617		9,242		924
Clamp & probe technology		829		484		829		276
Estech trade name		208		208		208		208
Total	$	10,379	$	2,409	$	10,379	$	1,501

Amortization expense related to intangible assets with definite lives was $302 and $355 for the three months ended September 30, 2015 and 2014, respectively, and $908 and $1,066 for the nine months ended September 30, 2015 and 2014, respectively.

Future amortization expense related to intangible assets with definite lives is projected as follows:

2015	$	300	October 1, 2015 through December 31, 2015
2016		1,201
2017		924
2018		924
2019		924
2020 and thereafter		3,697
Total	$	7,970

13

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

5. ACCRUED LIABILITIES

Accrued liabilities consisted of the following:

	September 30,		December 31,
	2015		2014
Accrued bonus	$	5,082	$	4,915
Accrued commissions		4,526		4,477
Accrued payroll and employee-related expenses		3,195		2,281
Accrued taxes and value-added taxes payable		725		1,272
Accrued royalties		361		442
Other accrued liabilities		298		399
Sales returns allowance		133		135
Accrued non-employee stock options		—		120
Total	$	14,320	$	14,041

6. INDEBTEDNESS

The Company has a debt agreement with Silicon Valley Bank (SVB). The agreement, as amended, restated and modified, includes a $15,000 revolving credit facility which matures on April 30, 2018. Borrowing availability under the revolving credit facility is based on the lesser of $15,000 or a borrowing base calculation as defined by the agreement. As of September 30, 2015 the Company had no borrowings under the revolving credit facility and had borrowing availability of $13,292.

Effective March 31, 2015, the Company and SVB entered into an Eighth Loan Modification Agreement (Loan Modification Agreement) which sets forth certain amendments to the Company’s credit facility. The Loan Modification Agreement provides for (i) an increase in the limit of outstanding letters of credit from $1,000 to $2,000, (ii) an extension of the revolving line maturity date from April 30, 2016 to April 30, 2018 and (iii) modifications to certain covenants and other terms of the agreement.

As of December 31, 2014 the Company had an outstanding letter of credit of €75 issued to its European subsidiary’s corporate credit card program provider which was due to expire on June 30, 2015. The letter of credit was cancelled in June 2015.

As of September 30, 2015 the Company had capital leases for computer and office equipment that expire at various terms through 2020. The cost of the assets under lease was $212. The assets are depreciated over their estimated useful lives, which equal the terms of the leases. Accumulated amortization on the capital leases was $99 at September 30, 2015.

Future maturities on capital lease obligations are projected as follows:

2015	$	14	October 1, 2015 through December 31, 2015
2016		55
2017		35
2018		21
2019		11
2020		4
Total payments	$	140
Imputed interest		(10)
Net capital lease obligations	$	130

7. COMMITMENTS AND CONTINGENCIES

Lease Commitments

The Company leases various types of office, manufacturing and warehouse facilities and equipment under noncancelable operating leases that expire at various terms through 2030.  

14

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

In August 2014 the Company and LM-VP AtriCure, LLC (Landlord), a third party unrelated to the Company, entered into a new building lease (Mason Lease) in order to re-locate its corporate headquarters and West Chester, Ohio facilities from their current location to a building to be constructed on Innovation Way in Mason, Ohio and occupied exclusively by the Company.

The term of the Mason Lease is fifteen years with three separate five-year renewal options, at the Company’s option, and begins upon substantial completion of the construction of the building (Commencement Date). The Mason Lease commenced in October 2015. The amount of initial annual base rent of $1,353 is payable monthly beginning on the Commencement Date and is subject to a 2% increase each year during the Lease’s initial term. Upon each renewal, the amount of rent payable will be agreed upon by the Company and Landlord or, if not so agreed upon, by an appraiser. The size of the building subject to the Lease is expected to be approximately 92 square feet.

Under the Mason Lease, the Company is responsible for paying real estate taxes, insurance, utilities, operating expenses and most building repairs and maintenance. The Company is also responsible for paying the first $750 of construction-related tenant improvement costs, as well as amounts in excess of the estimated total cost of construction, as defined by the Mason Lease. On the Commencement Date, the Company is required to provide a letter of credit to the Landlord in the amount of $1,250, which amount may decrease or be removed entirely based on the Company’s financial performance. A letter of credit in the amount of $1,250 was issued subsequent to September 30, 2015. The Company is deemed the owner of the project during the construction period. As a result, approximately $13,507and $3,941 of project costs incurred to date to construct the building are included in property and equipment and the financing obligation is included in other current liabilities in the Condensed Consolidated Balance Sheets as of September 30, 2015 and December 31, 2014, respectively. An increase in purchases of building under construction and proceeds from the construction financing obligation are also included in the Condensed Consolidated Statement of Cash Flows as of September 30, 2015.

Royalty Agreements

The Company has certain royalty agreements in place with terms that include payment of royalties based on product revenue from sales of specified current products. The royalty agreements have effective dates as early as 2003 and terms ranging from three years to at least twenty years. The royalties range from 0.75% to 5% of specified product sales. One of the agreements includes minimum quarterly payments of $50 through 2015 and a maximum of $2,000 in total royalties over the term of the agreement. Parties to the royalty agreements have the right at any time to terminate the agreement immediately for cause. Royalty expense of $423 and $356 was recorded as part of cost of revenue for the three months ended September 30, 2015 and 2014, respectively, and $1,321 and $925 was recorded for the nine months ended September 30, 2015 and 2014.

Purchase Agreements

The Company enters into standard purchase agreements with certain vendors in the ordinary course of business. Outstanding commitments at September 30, 2015 and 2014 were not significant.

Legal

The Company may, from time to time, become a party to legal proceedings.

8. INCOME TAX PROVISION

The Company files federal, state, and foreign income tax returns in jurisdictions with varying statutes of limitations. Income taxes are computed using the asset and liability method in accordance with FASB ASC 740, “Income Taxes”, under which deferred income taxes are provided for the temporary differences between the financial reporting basis and the tax basis of the Company’s assets and liabilities. Deferred taxes are measured using provisions of currently enacted tax laws. A valuation allowance against deferred tax assets is recorded when it is more-likely-than-not that such assets will not be fully realized. The Company has recorded a full valuation allowance against its net deferred tax assets as it is more-likely-than-not that the benefit of the deferred tax assets will not be recognized in future periods. Tax credits are accounted for as a reduction of income taxes in the year in which the credit originates. The Company does not expect any significant unrecognized tax benefits to arise over the next twelve months.

The Company’s provision for income taxes for continuing operations in interim periods is computed by applying its estimated annual effective rate against its loss before income tax (expense) benefit for the period. In addition, non-recurring or discrete items are recorded during the period in which they occur. The effective tax rate for the three months ended September 30, 2015 and 2014 was (0.09%) and (0.87%), respectively. The effective tax rate for the nine months ended September 30, 2015 and 2014 was (0.12%) and (0.33%), respectively.

15

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

The Company has not had to accrue any interest and penalties related to unrecognized income tax benefits as a result of offsetting net operating losses. However, if the situation occurs, the Company will recognize interest and penalties within the income tax expense (benefit) line in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss and within the related tax liability line in the Condensed Consolidated Balance Sheets.

9. EQUITY COMPENSATION PLANS

The Company has several share-based incentive plans: the 2001 Stock Option Plan (2001 Plan), the 2005 Equity Incentive Plan (2005 Plan), the Amended and Restated 2014 Stock Incentive Plan (2014 Plan) and the 2008 Employee Stock Purchase Plan (ESPP).

2001 Plan, 2005 Plan and 2014 Plan

Neither the 2001 Plan nor 2005 Plan is currently used for granting incentives. The Company granted awards under the 2005 Plan until the 2014 Annual Meeting of Stockholders at which stockholders adopted the 2014 Plan. Pursuant to its terms, the 2014 Plan supersedes and replaces the 2005 Plan. Under the 2014 Plan, the Board of Directors may grant incentive stock options to employees and any parent or subsidiary’s employees, and may grant nonstatutory stock options, restricted stock or stock appreciation rights to employees, directors and consultants of the Company and any parent or subsidiary’s employees, directors and consultants. The administrator (currently the Compensation Committee of the Board of Directors) has the power to determine the terms of any awards, including the number of shares subject to each award, the exercisability of the awards and the form of consideration. As of September 30, 2015, 8,949 shares of common stock had been reserved for issuance under the 2014 Plan.

Options granted under the plans generally expire tenyears from the date of grant. Options granted from the 2005 Plan and 2014 Plan generally vest at a rate of 25% on the first anniversary date of the grant and ratably each month thereafter over the following threeyears. Restricted stock awards granted under the 2005 Plan and 2014 Plan generally vest 25% annually over four years from date of grant.

Employee Stock Purchase Plan (ESPP)

During 2008 the Company established the Employee Stock Purchase Plan which is available to eligible employees as defined in the ESPP. Under the ESPP, shares of the Company’s common stock may be purchased at a discount (currently 15%) of the lesser of the closing price of the Company’s common stock on the first trading day or the last trading day of the offering period. The offering period (currently six months) and the offering price are subject to change. Participants may not purchase more than $25 of the Company’s common stock in a calendar year and, effective January 1, 2014, may not purchase more than 3 shares during an offering period. Beginning on January 1, 2009 and on the first day of each fiscal year thereafter during the term of the ESPP, the number of shares available for sale under the ESPP shall be increased by the lesser of (i) two percent (2%) of the Company’s outstanding shares of common stock as of the close of business on the last business day of the prior calendar year, not to exceed 600 shares, or (ii) a lesser amount determined by the Board of Directors. At September 30, 2015 there were 524 shares available for future issuance under the ESPP.

Expense Information Under FASB ASC 718

The following table summarizes share-based compensation expense related to employee share-based compensation under FASB ASC 718 for the three and nine months ended September 30, 2015 and 2014. This expense was allocated as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Cost of revenue	$	112	$	86	$	308	$	250
Research and development expenses		374		276		1,010		675
Selling, general and administrative expenses		1,906		1,354		5,215		4,779
Total share-based compensation expense related to   employees	$	2,392	$	1,716	$	6,533	$	5,704

10. SEGMENT AND GEOGRAPHIC INFORMATION

The Company evaluates reporting segments in accordance with FASB ASC 280, “Segment Reporting”. The Company develops, manufactures, and sells devices designed primarily for the surgical ablation of cardiac tissue and systems designed for the exclusion of

16

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

the left atrial appendage. These devices are developed and marketed to a broad base of medical centers in the United States and internationally. Management considers all such sales to be part of a single reportable segment. Revenue attributed to geographic areas is based on the location of the customers to whom products are sold.

Revenue by geographic area was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
United States	$	24,665	$	20,060	$	73,332	$	58,106
Europe		3,972		4,576		12,510		13,183
Asia		2,609		1,870		7,447		6,341
Other international		177		172		603		409
Total international		6,758		6,618		20,560		19,933
Total revenue	$	31,423	$	26,678	$	93,892	$	78,039

Domestic revenue by product type was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Open-heart ablation	$	13,041	$	11,265	$	39,043	$	32,498
Minimally invasive ablation		5,011		3,933		14,415		11,774
AtriClip		5,927		4,285		17,716		11,856
Total ablation and AtriClip		23,979		19,483		71,174		56,128
Valve tools		686		577		2,158		1,978
Total domestic	$	24,665	$	20,060	$	73,332	$	58,106

International revenue by product type was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Open-heart ablation	$	4,092	$	4,150	$	12,396	$	12,175
Minimally invasive ablation		1,945		1,804		5,771		5,773
AtriClip		598		543		2,058		1,390
Total ablation and AtriClip		6,635		6,497		20,225		19,338
Valve tools		123		121		335		595
Total international	$	6,758	$	6,618	$	20,560	$	19,933

The majority of the Company’s long-lived assets are located in the United States.

11. PUBLIC OFFERINGS OF COMMON STOCK

In February 2014 the Company completed a public offering of common stock under its January 2014 shelf registration. The Company sold 3,661 shares of common stock, par value $0.001 per share, at a price of $19.25 per share, generating proceeds of $65,830 after expenses. Offering costs were recorded in additional paid in capital to offset proceeds.

17

ATRICURE, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except per share amounts)

(Unaudited)

12. SUBSEQUENT EVENT

On October 13, 2015 the Company acquired nContact Surgical, Inc. (nContact) pursuant to a merger agreement. The Company acquired 100% of the voting equity interests of nContact. The transaction consideration consists of an upfront payment of 3,757 shares of AtriCure common stock and approximately $7,600 in cash, subject to closing adjustments. The transaction also includes up to $50,000 in additional contingent consideration based on completion of enrollment of the CONVERGE IDE trial and PMA approval by December 31, 2020. Additionally, nContact shareholders are entitled to additional sales-based contingent consideration on revenue in excess of an annual growth rate of more than 25% through 2019. Subject to the terms and conditions of the merger agreement, all contingent consideration can be paid in either cash or AtriCure common stock, or a combination of both, at the Company’s discretion.

The product portfolio acquired includes innovative devices that provide for less invasive ablation options for the treatment of cardiac arrhythmias.The Company expects the combined entity to offer improved market access and additional collaboration opportunities with cardiac surgeons and electrophysiologists. The initial accounting for this acquisition is expected to be completed during the fourth quarter of 2015. Transaction expenses of approximately $526 were recorded as a part of selling, general and administrative expenses during the three and nine months ended September 30, 2015.

18

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

(Dollar amounts referenced in this Item 2 are in thousands, except per share amounts.)

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with the accompanying Condensed Consolidated Financial Statements and notes thereto contained in Item 1 of Part I of this Form 10-Q and our audited financial statements and notes thereto as of and for the year ended December 31, 2014 included in our Form 10-K filed with the Securities and Exchange Commission (SEC) to provide an understanding of our results of operations, financial condition and cash flows.

Forward-Looking Statements

This Form 10-Q, including the sections titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and “Risk Factors,” contains forward-looking statements regarding our future performance. All forward-looking information is inherently uncertain and actual results may differ materially from assumptions, estimates or expectations reflected or contained in the forward-looking statements as a result of various factors, including those set forth under “Risk Factors” and elsewhere in this quarterly report on Form 10-Q, and in our annual report on Form 10-K for the year ended December 31, 2014. Forward-looking statements convey our current expectations or forecasts of future events. All statements contained in this Form 10-Q other than statements of historical fact are forward-looking statements. Forward-looking statements include statements regarding our future financial position, business strategy, budgets, projected costs, plans and objectives of management for future operations. The words “may,” “continue,” “estimate,” “intend,” “plan,” “will,” “believe,” “project,” “expect,” “anticipate” and similar expressions may identify forward-looking statements, but the absence of these words does not necessarily mean that a statement is not forward-looking. With respect to the forward-looking statements, we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995. These forward-looking statements speak only as of the date of this Form 10-Q. We undertake no obligation to publicly update or revise any forward-looking statements to reflect new information or future events or otherwise unless required by law.

Overview

We are a leading atrial fibrillation (Afib) solutions partner providing innovative products, professional education and support for clinical science to reduce the economic and social burden of Afib.  We have two ablation product lines. Our primary ablation product line, which accounts for a majority of our revenue, is the Isolator Synergy™ System, a bipolar radio frequency (RF) ablation generator,  switch box and associated single use devices. We also offer a cryosurgery product line, including both reusable and single use cryoablation devices. Our AtriClip® Left Atrial Appendage Exclusion System (AtriClip system) is the most widely implanted left atrial appendage management (LAAM) device worldwide. We believe cardiothoracic surgeons are adopting our ablation and LAAM devices for the treatment of Afib and prevention of stroke.

Cardiothoracic surgeons have adopted our RF ablation and cryosurgery systems to treat an estimated 189,000 patients since 2004, and we believe that we are currently the market leader in the surgical treatment of Afib. Our products are utilized by cardiothoracic surgeons during both open-heart and minimally invasive surgical procedures and in both concomitant and sole-therapy cases. During a concomitant procedure, the surgeon ablates cardiac tissue and/or excludes the left atrial appendage, secondary, or concomitant, to a primary cardiac procedure such as a valve replacement or coronary bypass graft. Our Isolator Synergy System, which includes our Isolator Synergy clamps, RF generator and related switchbox, is the only medical device approved by the United States Food and Drug Administration (FDA) for the surgical treatment of Afib. The Isolator Synergy System is indicated for the treatment of persistent and long-standing persistent Afib concomitant to other open-heart surgical procedures such as coronary artery bypass grafting and/or valve replacement or repair. To date, none of our other products have been approved or cleared by FDA specifically for the treatment of Afib. Our other ablation products are FDA cleared for ablation of cardiac tissue and/or treatment of cardiac arrhythmias. In addition, our cryoICE® probe is cleared for blocking pain by temporarily ablating peripheral nerves. The AtriClip System is cleared for occlusion of the left atrial appendage, under direct visualization, concomitant to other open cardiac procedures. We also have a line of reusable surgical instruments typically used for cardiac valve replacement or repair. We anticipate that substantially all of our revenue for the foreseeable future will relate to products we currently sell, or are in the process of developing, which surgeons generally use to ablate cardiac tissue, to exclude the left atrial appendage, to perform mitral and aortic valve replacement and repair, and/or to ablate peripheral nerves during cardiothoracic surgery.

We sell our products to medical centers in the United States(U.S.) through our direct sales force. AtriCure Europe, B.V., our wholly-owned subsidiary incorporated and based in the Netherlands, markets and sells our products throughout Europe and the Middle East primarily through distributors, while in certain markets, such as Germany, France, the United Kingdom and the Benelux region, we sell directly to medical centers. We also sell our products to other international distributors, primarily in Asia, South America and Canada. Our business is primarily transacted in U.S. dollars with the exception of transactions with our European subsidiary which are substantially transacted in Euros or British Pounds.

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Recent Developments

The December 2011 FDA approvalof our Isolator Synergy System includedthe requirement to implement a 350-patient post-approval study (PAS).  The PAS was designed to evaluate the long-term safety and efficacy of our Isolator Synergy System in the treatment of persistent and long-standing persistent Afib in patients undergoing open-heart procedures. Enrollment in the trial was completed in October 2014 with 365 patients at 40 medical centers. We expect to release preliminary data from the study in early 2016, with a complete report expected to be published in 2017.

We conducted the Dual Epicardial Endocardial Persistent Atrial Fibrillation (Staged DEEP AF) Feasibility clinical trial to evaluate use of the Isolator Synergy System for the treatment of Afib in a two-part procedure where a minimally invasive surgical ablation procedure is performed first, and an intracardiac catheter mapping and ablation procedure is then performed on a different day during the same hospitalization. Enrollment in the Staged DEEP AF trial was completed during the fourth quarter of 2013, with 30 patients enrolled at six medical centers.

We submitted an Investigational Device Exemption (IDE) application for the Staged DEEP AF pivotal trial to FDA in May 2014. The Staged DEEP AF pivotal trial evaluates the safety and efficacy of the Isolator Synergy System when used in a staged approach, where a minimally invasive surgical ablation procedure is first performed and the patient undergoes the intracardiac catheter procedure approximately 90-120 days later. FDA approval to enroll up to 220 subjects at 23 domestic medical centers and two international medical centers was received during the third quarter of 2014. Enrollment began during the first quarter of 2015, and there are currently fifteen patients enrolled and ten sites initiated.

We also conducted a Stroke Feasibility clinical trial with the AtriClip System. The trial evaluates the initial procedural safety and efficacy of the AtriClip System for stroke prophylaxis (prevention of stroke) in patients with non-valvular Afib in whom long term oral anticoagulation therapy is medically contraindicated. We had approval to enroll up to 30 patients at seven medical centers during the course of the trial. Enrollment began in the first quarter of 2014 and involved twelve patients. A Pre-Submission Meeting was held with the FDA during the first quarter of 2015 to discuss the early termination of enrollment in the Stroke Feasibility clinical trial and proceeding to the pivotal trial. The FDA has approved the termination of the feasibility study at twelve enrolled subjects. The pivotal trial design is under discussion with the FDA.

We are in the beginning stages of our ATLAS study, which is a non-IDE randomized pilot study evaluating outcomes of patients with risk factors for developing postoperative Afib as well as risk of bleeding on oral anticoagulation. The two arms are as follows; those receiving  prophylactic exclusion of the left atrial appendage with the AtriClip concomitant to cardiac surgery and those with a postoperative atrial fibrillation diagnosis who are medically managed. We have finalized the study protocol and expect to begin enrollment near the end of 2015, pending applicable approvals. At full capacity, we expect to enroll approximately 2,000 patients at up to twenty sites.

We are also pursuing a non-IDE trial in Europe, CEASE AF, to compare staged hybrid ablation treatment (minimally invasive surgical ablation procedure is first performed and the patient undergoes the intracardiac catheter procedure approximately 91-180 days later) versus catheter ablation alone. We have finalized the study protocol and anticipate enrollment of the first patient in the fourth quarter of 2015, pending applicable approvals. We expect the study to have an enrollment of approximately 210 patients across tensites.

In June 2015 we received confirmation from the Office of Inspector General that we satisfactorily completed all of our obligations under the five-year Corporate Integrity Agreement entered into in 2010 as a result of a settlement agreement with the Department of Justice.

In September 2015 we announced the launch of the cryoFORM™ cryoablation probe, which offers increased probe flexibility to adapt to a variety of surgical ablation procedures. This offering adds to the cryoICE™ family of ablation products which are used in the cryosurgical treatment of cardiac arrhythmias.The cryoFORM™ probe builds off of our core strengths in cryoablation technology, leveraging such important features as thermal capacity to remove heat and active defrost, which allows the probe to be safely and quickly detached while maintaining the tissue’s frozen state. Building upon those strengths, the new probe offers increased flexibility, allowing the surgeon to more easily manipulate and apply the device and conform to challenging anatomies.

On October 13, 2015 we acquired nContact Surgical, Inc. (nContact) pursuant to a merger agreement. The transaction consideration consists of an upfront payment of 3,757shares of AtriCure common stock and approximately $7,600 in cash, subject to closing adjustments. The transaction also includes up to $50,000 in additional contingent consideration based on completion of enrollment of the CONVERGE IDE trial and PMA approval before December 31, 2020. Additionally, nContact shareholders are entitled to additional sales-based contingent consideration on revenue in excess of an annual growth rate of more than 25% through 2019. Subject to the terms and conditions of the merger agreement, all contingent consideration can be paid in either cash or AtriCure common stock, or a combination of both, at our discretion. The product portfolio acquired includes innovative devices that provide for less invasive ablation options for the treatment of cardiac arrhythmias.

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Results of Operations

Three months ended September 30, 2015 compared to three months ended September 30, 2014

The following table sets forth, for the periods indicated, our results of operations expressed as dollar amounts and as percentages of total revenue:

	Three Months Ended
	September 30,
	2015				2014
	Amount		% of Revenues		Amount		% of Revenues
Revenue	$	31,423	100.0	%	$	26,678	100.0	%
Cost of revenue		8,945	28.5	%		7,786	29.2	%
Gross profit		22,478	71.5	%		18,892	70.8	%
Operating expenses:
Research and development expenses		6,504	20.7	%		5,033	18.8	%
Selling, general and administrative expenses		22,101	70.3	%		14,662	55.0	%
Total operating expenses		28,605	91.0	%		19,695	73.8	%
Loss from operations		(6,127)	(19.5)	%		(803)	(3.0)	%
Other income (expense):
Interest expense		(16)	0.0	%		(24)	(0.1)	%
Interest income		56	0.2	%		27	0.1	%
Other		(48)	(0.2)	%		338	1.3	%
Total other (expense) income		(8)	(0.0)	%		341	1.3	%
Loss before income tax expense		(6,135)	(19.5)	%		(462)	(1.7)	%
Income tax expense		6	0.0	%		4	—	%
Net loss	$	(6,141)	(19.5)	%	$	(466)	(1.7)	%

Revenue. Total revenue increased 17.8%(20.6% on a constant currency basis) from $26,678 for the three months ended September 30, 2014 to $31,423 for the three months ended September 30, 2015. Constant currency basis amounts are calculated by applying previous period foreign currency exchange rates to each of the comparable periods. Revenue from sales to customers in the United States increased $4,605, or 23.0%, and revenue from sales to international customers increased $140, or 2.1% (13.2% on a constant currency basis). The increase in sales to customers in the United States was primarily due to increased sales of ablation-related open-heart products of $1,776, increased sales of ablation-related minimally invasive products of $1,078 and increased sales of the AtriClip system of $1,642. The increase in international revenue was primarily due to increased sales in Asia and the United Kingdom which offset the decline in the Euro-Dollar exchange rate between quarters.

Cost of revenue and gross margin. Cost of revenue increased $1,159, from $7,786 for the three months ended September 30, 2014 to $8,945 for the three months ended September 30, 2015.  As a percentage of revenue, cost of revenue decreased from 29.2% for the three months ended September 30, 2014 to 28.5% for the three months ended September 30, 2015. Gross margin for the three months ended September 30, 2015 and 2014 was 71.5% and70.8%, respectively. The increase in gross margin was primarily due to the heavier U.S. sales mix and the elimination of certain Estech transition costs included in the three months ended September 30, 2014, partially offset by heavier loaner generator depreciation.

Research and development expenses. Research and development expenses increased $1,471,  or 29.2%, from $5,033 for the three months ended September 30, 2014to $6,504 for the three months ended September 30, 2015.  The increase in expense was primarily due to a  $752 increase in product development, regulatory and clinical personnel expense,  a $345 increase in product development project expense, a $128 increase in regulatory filing expense and a $98 increase in share-based compensation, partially offset by slight decreases in clinical trial spending.

Selling, general and administrative expenses. Selling, general and administrative expenses increased $7,439, or 50.7%, from $14,662 for the three months ended September 30, 2014 to $22,101 for the three months ended September 30, 2015. The increase was primarily due to the $5,370 favorable impact of the fair value adjustment of Estech contingent consideration recorded during the three months ended September 30, 2014, a $1,443increase in personnel expense and a $552 increase in share-based compensation expense, as well as $526 in transaction costs recorded in connection with the acquisition of nContact during the three months ended September 30, 2015.

Net interest income. Net interest income for the three months ended September 30, 2015 and 2014 was $40 and $3, respectively.

Other income and expense. Other income and expense consists primarily of foreign currency transaction gains and losses, grant income and non-employee option gains and losses related to the fair market value change for fully vested options outstanding for

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consultants, which are accounted for as free-standing derivatives. Net other (expense) income for the three months ended September 30, 2015 and 2014 totaled ($48) and $338, respectively.

Nine months ended September 30, 2015 compared to nine months ended September 30, 2014

The following table sets forth, for the periods indicated, our results of operations expressed as dollar amounts and as percentages of total revenue:

	Nine Months Ended
	September 30,
	2015				2014
	Amount		% of Revenues		Amount		% of Revenues
Revenue	$	93,892	100.0	%	$	78,039	100.0	%
Cost of revenue		26,562	28.3	%		22,709	29.1	%
Gross profit		67,330	71.7	%		55,330	70.9	%
Operating expenses:
Research and development expenses		17,975	19.1	%		13,603	17.4	%
Selling, general and administrative expenses		65,445	69.7	%		53,308	68.3	%
Total operating expenses		83,420	88.8	%		66,911	85.7	%
Loss from operations		(16,090)	(17.1)	%		(11,581)	(14.8)	%
Other income (expense):
Interest expense		(51)	(0.1)	%		(290)	(0.4)	%
Interest income		142	0.2	%		64	0.1	%
Other		(279)	(0.3)	%		976	1.2	%
Total other (expense) income		(188)	(0.2)	%		750	0.9	%
Loss before income tax expense		(16,278)	(17.3)	%		(10,831)	(13.9)	%
Income tax expense		20	0.0	%		36	—	%
Net loss	$	(16,298)	(17.4)	%	$	(10,867)	(13.9)	%

Revenue. Total revenue increased 20.3%(23.7% on a constant currency basis) from $78,039 for the nine months ended September 30, 2014 to $93,892 for the nine months ended September 30, 2015. Constant currency basis amounts are calculated by applying previous period foreign currency exchange rates to each of the comparable periods. Revenue from sales to customers in the United States increased $15,226, or 26.2%, and revenue from sales to international customers increased $627,  or 3.1% (16.2% on a constant currency basis). The increase in sales to customers in the United States was primarily due to increased sales of ablation-related open-heart products of $6,545,increased sales of ablation-related minimally invasive products of $2,641and increased sales of the AtriClip system of $5,860. The increase in international revenue was primarily due to increased sales in Asia, the United Kingdom, Germany and the Benelux region which offset the decline in the Euro-Dollar exchange rate between periods.

Cost of revenue and gross margin. Cost of revenue increased $3,853, from $22,709 for the nine months ended September 30, 2014 to $26,562 for the nine months ended September 30, 2015.  As a percentage of revenue, cost of revenue decreased from 29.1% for the nine months ended September 30, 2014 to 28.3% for the nine months ended September 30, 2015. Gross margin for the nine months ended September 30, 2015 and 2014 was 71.7% and 70.9%, respectively. The increase in gross margin was primarily due to the heavier U.S. sales mix and the elimination of certain Estech transition costs included in the nine months ended September 30, 2014, partially offset by heavier loaner depreciation and a slight increase in scrap and obsolescence related primarily to non-core or Estech products.

Research and development expenses. Research and development expenses increased $4,372,  or 32.1%, from $13,603 for the nine months ended September 30, 2014to $17,975 for the nine months ended September 30, 2015.  The increase in expense was primarily due to a  $2,127 increase in product development, regulatory and clinical personnel expense,a $1,192 increase in product development project expense and a $335 increase in share-based compensation expense. 

Selling, general and administrative expenses. Selling, general and administrative expenses increased $12,137, or 22.8%, from $53,308 for the nine months ended September 30, 2014 to $65,445 for the nine months ended September 30, 2015.  The increase was primarily due to the favorable impact of the $8,032 fair value adjustment of Estech contingent consideration recorded during the nine months ended September 30, 2014, a $2,500 increase in personnel expense and a $1,051 increase in training and related expenses, as well as $526 in transaction costs recorded in connection with the acquisition of nContact during the nine months ended September 30, 2015.The increase is partially offset by $3,082 of transaction, transition and severance expense related to the acquisition of Estech recorded during the nine months ended September 30, 2014.

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Net interest income (expense). Net interest income (expense) for the nine months ended September 30, 2015 and 2014 was $91 and ($226), respectively. Net interest expense in 2014 primarily represents interest on the Silicon Valley Bank (SVB) term loan paid during the nine months ended September 30, 2014, prior to the repayment of the debt in March 2014.

Other income and expense. Other income and expense consists primarily of foreign currency transaction gains and losses, grant income and non-employee option gains and losses related to the fair market value change for fully vested options outstanding for consultants, which are accounted for as free-standing derivatives. Net other (expense) income for the nine months ended September 30, 2015 and 2014 totaled ($279) and $976, respectively.

Liquidity and Capital Resources

As of September 30, 2015 the Company had cash, cash equivalents and investments of $58,807 and no outstanding debt, resulting in a net cash position of $58,807. We had unused borrowing capacity of $13,292under our revolving credit facility. Most of our cash is held by financial institutions in the United States of America. We had net working capital of $45,048 and an accumulated deficit of $154,722 as of September 30, 2015.

Cash flows used in operating activities. Net cash used in operating activities for the nine months ended September 30, 2015 was $3,762. The primary net uses of cash for operating activities were as follows:

· the net loss of $16,298, offset by $11,734 of non-cash expenses, including $6,533 in share-based compensation and $4,212 in depreciation and amortization; and

· a net decrease in cash used related to changes in operating assets and liabilities of $802, due primarily to the following:

· a  decrease in accounts receivable of $571, due primarily to the timing of collections during the nine months ended September 30, 2015;

· an increase in inventory of $2,461, due primarily to increased inventory levels in support of anticipated revenue growth; and

· a $2,738increase in accounts payable and accrued liabilities due primarily to the timing of payments, including variable compensation payments.

Cash flows provided by investing activities. Net cash used in investing activities was $7,766 for the nine months ended September 30, 2015. The primary source of cash from investing activities was  $29,174 related to sales and maturities of available-for-sale securities. This source of cash was partially offset by $19,525 for purchases of available-for-sale securities, $8,287 related to the purchase of property and equipment, which included the placement of our RF and cryo generators with our customers, as well as furniture, fixtures and other property associated with the Mason facility, and $9,128 for increases in property under a build-to-suit obligation.

Cash flows provided by financing activities. Net cash provided by financing activities during the nine months ended September 30, 2015 was $12,047, which was primarily due to increases in a build-to-suit obligation of $9,128, proceeds from stock option exercises of $2,421, proceeds from the issuance of common stock under our employee stock purchase plan of $906 and proceeds from a tax incentive loan of $340, partially offset by shares repurchased for payment of taxes on stock awards of $650, capital lease payments and debt fees.

Credit facility. The Company’s Loan and Security Agreement with SVB, as amended, restated, and modified (Agreement) provides for a revolving credit facility under which we may borrow a maximum of $15,000. Borrowing availability under the revolving credit facility is based on the lesser of $15,000 or a borrowing base calculation as defined by the Agreement. As of September 30, 2015 we had no borrowings under the revolving credit facility, and we had borrowing availability of $13,292. The applicable borrowing rate on the revolving facility is the prime rate during a period when we meet the requirements for Streamline Period, which are based on available cash and amounts drawn under the credit facility, and prime plus 1.25% at all other times.The revolving credit facility expires on April 30, 2018.

The Agreement contains covenants that include, among others, covenants that limit our ability to dispose of assets, enter into mergers or acquisitions, incur indebtedness, incur liens, pay dividends or make distributions on our capital stock, make investments or loans, and enter into certain affiliate transactions, in each case subject to customary exceptions for a credit facility of this size and type. Additional covenants apply when we have outstanding borrowings under the revolving credit facility or when we hold less than $20,000 in cash and investments with SVB. Financial covenants under the credit facility include a minimum EBITDA and a minimum liquidity ratio. Further, a minimum fixed charge ratio applies when specific covenant milestones are achieved. None of the covenants must be applied as of September 30, 2015. The occurrence of an event of default could result in an increase to the applicable interest rate by 3.0%, an acceleration of all obligations under the Agreement, an obligation to repay all obligations in full and a right by SVB to exercise all remedies available to it under the Agreement and related agreements including the Guaranty and Security Agreement. Specified assets have been pledged as collateral.

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We had an outstanding letter of credit of €75 issued to our European subsidiary’s corporate credit card provider which was due to expire on June 30, 2015. The letter of credit was cancelled in June 2015. In connection with the terms of our Mason facility lease, a letter of credit in the amount of $1,250 was issued to the landlord of our Mason facility in October 2015.

Uses of liquidity and capital resources. Our future capital requirements depend on a number of factors, including the rate of market acceptance of our current and future products, the resources we devote to developing and supporting our products, future expenses to expand and support our sales and marketing efforts, costs relating to changes in regulatory policies or laws that affect our operations and costs of filing, costs associated with clinical trials and securing regulatory approval for new products, costs associated with acquiring and integrating businesses, costs associated with prosecuting, defending and enforcing our intellectual property rights and possible acquisitions and joint ventures. Global economic turmoil may adversely impact our revenue, access to the capital markets or future demand for our products.

In January 2014 we filed a shelf registration statement with the SEC which allows us to sell any combination of senior or subordinated debt securities, common stock, preferred stock, warrants, depositary shares and units in one or more offerings should we choose to do so in the future. In February 2014 we sold 3,660,525 shares of common stock under the shelf registration which resulted in net proceeds of approximately $65,830.

We believe that our current cash, cash equivalents and investments, along with the cash we expect to generate or use for operations or access via our revolving credit facility, will be sufficient to meet our anticipated cash needs for working capital and capital expenditures for at least the next twelve months. Such cash needs over the next twelve months include approximately $7,600 of cash paid at the closing of the acquisition of nContact on October 13, 2015, as well as incremental operating and integration costs resulting from the acquisition. The transaction provides for contingent consideration to be paid upon attaining specified clinical and revenue milestones over the next five years. Subject to the terms and conditions of the nContact merger agreement, such contingent consideration can be paid in either cash or stock, at our discretion. Over the next twelve months, we do not expect our cash requirements to include significant payments of contingent consideration based on terms of the acquisition agreement and related milestones.

If our sources of cash are insufficient to satisfy our liquidity requirements, we may seek to sell additional equity or debt securities or obtain a revised or additional credit facility. The sale of additional equity or convertible debt securities could result in dilution to our stockholders. If additional funds are raised through the issuance of debt securities, these securities could have rights senior to those associated with our common stock and could contain covenants that would restrict our operations. Additional financing may not be available at all, or in amounts or terms acceptable to us. Finally, our credit facility requires compliance with certain financial and other covenants. If we are unable to obtain this additional financing, we may be required to reduce the scope of our planned research and development, clinical activities and selling and marketing efforts.

Off-Balance-Sheet Arrangements

As of September 30, 2015 we had operating lease agreements not recorded on the Condensed Consolidated Balance Sheets. Operating leases are utilized in the normal course of business.

Seasonality

During the third quarter, we typically experience a moderate decline in revenue that we attribute primarily to the elective nature of certain procedures in which our products are used. We believe this is due to fewer people choosing to undergo elective procedures during the summer months.

Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition and results of operations is based upon our financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP). The preparation of financial statements requires management to make estimates and judgments that affect the reported amounts of assets and liabilities, revenue and expenses and disclosures of contingent assets and liabilities at the date of the financial statements. On a periodic basis, we evaluate our estimates, including those related to sales returns and allowances, accounts receivable, inventories and share-based compensation. We use authoritative pronouncements, historical experience and other assumptions as the basis for making estimates. Actual results could differ from those estimates under different assumptions or conditions. Our Annual Report on Form 10-K for the fiscal year ended December 31, 2014 includes additional information about the Company, our operations, our financial position and our critical accounting policies and estimates and should be read in conjunction with this Quarterly Report.

Recent Accounting Pronouncements

See Note 2 in the Notes to the Condensed Consolidated Financial Statements for a discussion of recent accounting pronouncements.

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Item 3.  Quantitative and Qualitative Disclosures About Market Risk

As of September 30, 2015 there were no material changes to the information provided under Item 7A, “Quantitative and Qualitative Disclosures About Market Risk” in the Company’s Form 10-K for the year ended December 31, 2014.

Item 4.  Controls and Procedures

Disclosure Controls and Procedures

We have evaluated the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13(a)-15(e) and 15(d)-15(e) of the Securities Exchange Act of 1934 (Exchange Act), as of the end of the period covered by this report. Our management, including the President and Chief Executive Officer (the Principal Executive Officer) and Senior Vice President and Chief Financial Officer (the Principal Accounting and FinancialOfficer), supervised and participated in the evaluation. Based on the evaluation, we concluded that, as of the end of the period covered by this report, our disclosure controls and procedures were effective in providing reasonable assurance that information required to be disclosed by us in the reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s forms and rules, and the material information relating to the Company is accumulated and communicated to management, including the President and Chief Executive Officer (the Principal Executive Officer) and Senior Vice President and Chief Financial Officer (the Principal Accounting and Financial Officer), as appropriate, to allow timely decisions regarding required disclosures.

Control systems, no matter how well designed and operated, can provide only reasonable, not absolute, assurance that control objectives are met. Because of inherent limitations in all control systems, no evaluation of controls can provide assurance that all control issues and instances of fraud, if any, within a company will be detected. Additionally, controls can be circumvented by individuals, by collusion of two or more people, or by management override. Over time, controls can become inadequate because of changes in conditions or the degree of compliance may deteriorate. Further, the design of any system of controls is based in part upon assumptions about the likelihood of future events. There can be no assurance that any design will succeed in achieving its stated goals under all future conditions. Because of the inherent limitations in any cost-effective control system, misstatements due to errors or fraud may occur and not be detected.

Changes in Internal Control Over Financial Reporting

In the ordinary course of business we routinely enhance our information systems by either upgrading current systems or implementing new ones. There were no changes in our internal control over financial reporting that occurred during the three months ended September 30, 2015 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II. OTHER INFORMATION

Item 1.  Legal Proceedings

Information with respect to legal proceedings can be found under the heading “Legal” in Note 7 – Commitments and Contingencies to the Condensed Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q, and is incorporated herein by reference.

Item 1A.  Risk Factors

In addition to the other information set forth in this report, careful consideration should be given to the factors discussed in Item 1A, “ Risk Factors” in our Form 10-K for the year ended December 31, 2014, all of which could materially affect our business, financial condition or future results. The risks described are not the only risks facing us. Additional risks and uncertainties not currently known to us, or that we currently deem to be immaterial, also may adversely affect our business, financial condition and/or operating results. There have been no material changes with respect to the risk factors disclosed in our Annual Report on Form 10-K for the year ended December 31, 2014.

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Item 6.  Exhibits

Exhibit     No.	Description
31.1	Rule 13a-14(a) Certification of Principal Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Rule 13a-14(a) Certification of Principal Accounting and Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certification pursuant to 18 U.S.C. Section 1350 by the Principal Executive Officer, as adopted, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2	Certification pursuant to 18 U.S.C. Section 1350 by the Principal Accounting and Financial Officer, as adopted, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

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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, thereunto duly authorized.

	AtriCure, Inc.
	(REGISTRANT)
Date:October30,2015	/s/ MichaelH.Carrel
	Michael H. Carrel
	PresidentandChiefExecutiveOfficer (PrincipalExecutiveOfficer)
Date:October30,2015	/s/M. Andrew Wade
	M. Andrew Wade
	SeniorVice PresidentandChiefFinancialOfficer (PrincipalAccountingandFinancialOfficer)

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EXHIBIT INDEX

Exhibit     No.	Description
31.1	Rule 13a-14(a) Certification of Principal Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Rule 13a-14(a) Certification of Principal Accounting and Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certification pursuant to 18 U.S.C. Section 1350 by the Principal Executive Officer, as adopted, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2	Certification pursuant to 18 U.S.C. Section 1350 by the Principal Accounting and Financial Officer, as adopted, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Label Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

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EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

PURSUANT TO

SECTION 13(a) OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Michael H. Carrel, certify that:

1. I have reviewed this quarterly report on Form 10-Q of AtriCure, 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)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

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

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

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

Date: October 30, 2015

By:	/s/MichaelH.Carrel
	MichaelH.Carrel
	PresidentandChiefExecutiveOfficer
	(PrincipalExecutiveOfficer)

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL ACCOUNTING AND FINANCIAL OFFICER

PURSUANT TO

SECTION 13(a) OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

AS ADOPTED PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, M. Andrew Wade, certify that:

1. I have reviewed this quarterly report on Form 10-Q of AtriCure, 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)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

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

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

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

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

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

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

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

Date: October 30, 2015

By:	/s/ M. Andrew Wade
	M.AndrewWade
	SeniorVicePresidentandChiefFinancialOfficer
	(PrincipalAccountingandFinancialOfficer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report of AtriCure, Inc. (Company) on Form 10-Q for the quarter ended September 30, 2015 as filed with the Securities and Exchange Commission on the date hereof (Report), I, Michael H. Carrel, President and Chief Executive Officer and Principal Executive Officer of the Company, certify, pursuant to Rule 13a–14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

Date: October 30, 2015

By:	/s/MichaelH.Carrel
	MichaelH.Carrel
	PresidentandChiefExecutiveOfficer
	(PrincipalExecutiveOfficer)

A signed original of this written statement or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement has been provided to AtriCure, Inc. and will be retained by AtriCure, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

The foregoing certification is being furnished solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) and is not being filed as part of the report or as a separate disclosure document.

EX-32.2

Exhibit 32.2

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 AtriCure, Inc. (Company) on Form 10-Q for the quarter ended September 30, 2015 as filed with the Securities and Exchange Commission on the date hereof (Report), I, M. Andrew Wade, Vice President and Chief Financial Officer and Principal Accounting and Financial Officer of the Company, certify, pursuant to Rule 13a–14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

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

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

Date: October 30, 2015

By:	/s/ M. Andrew Wade
	M.AndrewWade
	SeniorVicePresidentandChiefFinancialOfficer
	(PrincipalAccountingandFinancialOfficer)

A signed original of this written statement or other document authenticating, acknowledging, or otherwise adopting the signature that appears in typed form within the electronic version of this written statement has been provided to AtriCure, Inc. and will be retained by AtriCure, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.

The foregoing certification is being furnished solely pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) and is not being filed as part of the report or as a separate disclosure document.

XML

Indebtedness (Future Maturities on Capital Lease Obligations) (Details) $ in Thousands	Sep. 30, 2015 USD ($)
Indebtedness [Abstract]
Capital lease obligations due October 1, 2015 through December 31, 2015	$ 14
Capital lease obligations due 2016	55
Capital lease obligations due 2017	35
Capital lease obligations due 2018	21
Capital lease obligations due 2019	11
Capital lease obligations due 2020	4
Capital lease obligations total payments	140
Imputed interest	(10)
Net capital lease obligations	$ 130

XML

Public Offerings of Common Stock (Narrative) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	1 Months Ended	9 Months Ended
	Feb. 28, 2014	Sep. 30, 2014	Sep. 30, 2015	Dec. 31, 2014
Public Offerings of Common Stock [Abstract]
Common stock sold	3,661
Common stock, par value	$ 0.001		$ 0.001	$ 0.001
Common stock, price per share	$ 19.25
Proceeds from issuance of common stock	$ 65,830	$ 65,830

XML

Fair Value (Level 3 Fair Value Measurements Using Significant Other Unobservable Inputs for Acquisition-Related Contingent Consideration) (Details) - Significant Other Unobservable Inputs (Level 3) [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2014 USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 8,032
Amounts acquired
Transfers in (out) of Level 3
Changes in fair value included in earnings	$ (8,032)
Ending Balance

XML

Equity Compensation Plans (Tables)

9 Months Ended

Sep. 30, 2015

Equity Compensation Plans [Abstract]

Share-Based Compensation Expense Related to Employee Share-Based Compensation

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Cost of revenue	$	112	$	86	$	308	$	250
Research and development expenses		374		276		1,010		675
Selling, general and administrative expenses		1,906		1,354		5,215		4,779
Total share-based compensation expense related to   employees	$	2,392	$	1,716	$	6,533	$	5,704

XML

Equity Compensation Plans (Narrative) (Details) shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Description of participants purchase limit	Participants may not purchase more than $25 of the Company's common stock in a calendar year and, effective January 1, 2014, may not purchase more than 3 shares during an offering period.
Participants purchase limit shares	3
Offering period	6 months
2001 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiry of options from the date of grant	10 years
2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiry of options from the date of grant	10 years
2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for issuance	8,949
Expiry of options from the date of grant	10 years
2008 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Company's common stock may be purchased at a discount	15.00%
Participants purchase limit value | $	$ 25
Shares available for sale under the ESPP increased	2.00%
Outstanding shares of common stock exceed	600
Shares available for future issuance under the ESPP	524
Employee Stock Option [Member] | 2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period beginning	3 years
Employee Stock Option [Member] | 2005 Plan [Member] | First Anniversary Date Of Grant And Ratably Each Month Thereafter For Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	25.00%
Employee Stock Option [Member] | 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable period beginning	3 years
Employee Stock Option [Member] | 2014 Plan [Member] | First Anniversary Date Of Grant And Ratably Each Month Thereafter For Three Years [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	25.00%
Restricted Stock [Member] | 2005 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted from the 2005 Plan generally vest	4 years
Restricted Stock [Member] | 2005 Plan [Member] | Four Years From Date Of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	25.00%
Restricted Stock [Member] | 2014 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted from the 2005 Plan generally vest	4 years
Restricted Stock [Member] | 2014 Plan [Member] | Four Years From Date Of Grant [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage	25.00%

XML

Accrued Liabilities (Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Accrued Liabilities [Abstract]
Accrued bonus	$ 5,082	$ 4,915
Accrued commissions	4,526	4,477
Accrued payroll and employee-related expenses	3,195	2,281
Accrued taxes and value-added taxes payable	725	1,272
Accrued royalties	361	442
Other accrued liabilities	298	399
Sales returns allowance	133	135
Accrued non-employee stock options		120
Total	$ 14,320	$ 14,041

XML

Subsequent Event (Details) - nContact Surgical [Member] - USD ($) shares in Thousands, $ in Thousands		9 Months Ended
	Oct. 13, 2015	Sep. 30, 2015
Subsequent Event [Line Items]
Transaction expenses		$ 526
Subsequent Event [Member]
Subsequent Event [Line Items]
Consideration payment, shares	3,757
Consideration payment, value	$ 7,600
Contingent consideration due date		Dec. 31, 2020
Contingent consideration due date on annual growth rate		Dec. 31, 2019
Subsequent Event [Member] | Maximum [Member]
Subsequent Event [Line Items]
Contingent consideration	$ 50,000
Subsequent Event [Member] | Minimum [Member]
Subsequent Event [Line Items]
Sales-based contingent consideration on revenue of annual growth rate	25.00%

XML

Fair Value

9 Months Ended

Sep. 30, 2015

Fair Value [Abstract]

Fair Value

3. FAIR VALUE

FASB ASC 820, “Fair Value Measurements and Disclosures” (ASC 820) defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. The standard describes a fair value hierarchy based on three levels of inputs, of which the first two are considered observable and the last unobservable, that may be used to measure fair value which are the following:

· Level 1—Quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date. An active market for the asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis. The valuation under this approach does not entail a significant degree of judgment.

· Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; 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. The valuation technique for the Company’s Level 2 assets is based on quoted market prices for similar assets from observable pricing sources at the reporting date.

· 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. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available, thereby allowing for situations in which there is little, if any, market activity for the asset or liability at the measurement date. The fair value of the Company’s Level 3 instruments are estimated on the grant date using the Black-Scholes model and they are revalued at the end of each reporting period using the Black-Scholes model. The fair value of the Company’s Level 3 contingent consideration was estimated on the acquisition date of Endoscopic Technologies, Inc. and was revalued at the end of each subsequent reporting period.

In accordance with ASC 820, the following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2015:  

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	—	$	22,918	$	—	$	22,918
U.S. government agencies and securities		1,615		—		—		1,615
Corporate bonds		—		28,478		—		28,478
Total assets	$	1,615	$	51,396	$	—	$	53,011

There were no changes in the levels or methodology of measurement of financial assets and liabilities during the three or nine month periods ended September 30, 2015.

In accordance with ASC 820, the following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2014:  

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	—	$	23,692	$	—	$	23,692
Commercial paper		—		1,800		—		1,800
U.S. government agencies and securities		3,022		—		—		3,022
Corporate bonds		—		35,337		—		35,337
Total assets	$	3,022	$	60,829	$	—	$	63,851
Liabilities:
Derivative instruments	$	—	$	—	$	120	$	120
Acquisition-related contingent consideration		—		—		—		—
Total liabilities	$	—	$	—	$	120	$	120

There were no changes in the levels or methodology of measurement of financial assets and liabilities during the twelve months ended December 31, 2014.

Derivative Instruments. Vested non-employee options historically issued by the Company were accounted for as derivative liabilities and remeasured at fair value through earnings at each reporting period until exercised or forfeited. All vested non-employee options have been exercised as of September 30, 2015.  

In accordance with ASC 820, the following table represents the Company’s Level 3 fair value measurements using significant other unobservable inputs for derivative instruments as of September 30, 2015:  

Beginning Balance – January 1, 2015	$	120
Total losses included in earnings		57
Exercises		(177)
Reclassification from equity to liability when fully vested		—
Ending Balance – September 30, 2015	$	—

In accordance with ASC 820, the following table represents the Company’s Level 3 fair value measurements using significant other unobservable inputs for derivative instruments as of December 31, 2014:  

Beginning Balance – January 1, 2014	$	350
Total gains included in earnings		(183)
Exercises		(47)
Reclassification from equity to liability when fully vested		—
Ending Balance – December 31, 2014	$	120

Acquisition-Related Contingent Consideration. The Company acquired Endoscopic Technologies, Inc. (Estech) on December 31, 2013. The aggregate consideration paid to Estech shareholders includes up to $26,000 of contingent consideration to be paid based on the achievement of certain performance-based milestones in 2014 and 2015. The fair value of the contingent consideration was estimated using an expected present value approach to estimate an expected value, which, in statistical terms, is the weighted average of a discrete random variable’s possible values with the respective probabilities as the weights. This fair value measurement is based on significant inputs not observable in the market and thus represents a Level 3 measurement within the fair value hierarchy. Using this valuation technique, the fair value of the contingent consideration was determined to be $0 as of both September 30, 2015 and December 31, 2014.

The following table represents the Company’s Level 3 fair value measurements using significant other unobservable inputs for acquisition-related contingent consideration as of December 31, 2014: 

Beginning Balance – January 1, 2014	$	8,032
Amounts acquired		—
Transfers in (out) of Level 3		—
Changes in fair value included in earnings		(8,032)
Ending Balance – December 31, 2014	$	—

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Equity Compensation Plans (Share-Based Compensation Expense Related to Employee Share-Based Compensation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense related to employees	$ 2,392	$ 1,716	$ 6,533	$ 5,704
Cost of Revenue [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense related to employees	112	86	308	250
Research and Development Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense related to employees	374	276	1,010	675
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense related to employees	$ 1,906	$ 1,354	$ 5,215	$ 4,779

XML

Description of Business and Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (543)	$ (178)	$ (348)	$ (139)
Ending Balance	(490)	(588)	(490)	(588)
Unrealized Gains on Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(15)	(19)	(54)	(6)
Other comprehensive income (loss) before reclassifications	$ 17	$ (20)	$ 56	$ (33)
Amounts reclassified from accumulated other comprehensive income to other income on the statement of operations
Ending Balance	$ 2	$ (39)	$ 2	$ (39)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(528)	(159)	(294)	(133)
Other comprehensive income (loss) before reclassifications	67	(339)	135	(386)
Amounts reclassified from accumulated other comprehensive income to other income on the statement of operations	(31)	(51)	(333)	(30)
Ending Balance	$ (492)	$ (549)	$ (492)	$ (549)

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Description of Business and Summary of Significant Accounting Policies (Inventories) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Description of Business and Summary of Significant Accounting Policies [Abstract]
Raw materials	$ 5,371	$ 4,429
Work in process	1,013	1,397
Finished goods	10,183	8,431
Inventories	$ 16,567	$ 14,257

XML

Segment and Geographic Information (Revenue by Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 31,423	$ 26,678	$ 93,892	$ 78,039
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	24,665	20,060	73,332	58,106
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,972	4,576	12,510	13,183
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	2,609	1,870	7,447	6,341
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	177	172	603	409
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 6,758	$ 6,618	$ 20,560	$ 19,933

XML

Fair Value (Narrative) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Other Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration	$ 0	$ 0
Maximum [Member] | Estech [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Acquisition-related contingent consideration			$ 26,000

XML

Fair Value (Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Significant Other Unobservable Inputs (Level 3) [Member]
Liabilities:
Acquisition-related contingent consideration	$ 0	$ 0
Fair Value, Measurements, Recurring [Member]
Assets:
Total assets	53,011	63,851
Liabilities:
Derivative instruments		$ 120
Acquisition-related contingent consideration
Total liabilities		$ 120
Fair Value, Measurements, Recurring [Member] | Money Market Funds [Member]
Assets:
Total assets	22,918	23,692
Fair Value, Measurements, Recurring [Member] | Commercial Paper [Member]
Assets:
Total assets		1,800
Fair Value, Measurements, Recurring [Member] | U.S. Government Agencies and Securities [Member]
Assets:
Total assets	1,615	3,022
Fair Value, Measurements, Recurring [Member] | Corporate Bonds [Member]
Assets:
Total assets	28,478	35,337
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Total assets	1,615	$ 3,022
Liabilities:
Acquisition-related contingent consideration
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Agencies and Securities [Member]
Assets:
Total assets	1,615	$ 3,022
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total assets	51,396	$ 60,829
Liabilities:
Acquisition-related contingent consideration
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member]
Assets:
Total assets	22,918	$ 23,692
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper [Member]
Assets:
Total assets		1,800
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]
Assets:
Total assets	$ 28,478	35,337
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member]
Liabilities:
Derivative instruments		$ 120
Acquisition-related contingent consideration
Total liabilities		$ 120

XML

Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2015

Recent Accounting Pronouncements [Abstract]

Recent Accounting Pronouncements

2. RECENT ACCOUNTING PRONOUNCEMENTS

In May 2014 the FASB issued a final standard on revenue from contracts with customers. The standard, issued as FASB ASU 2014-09, “Revenue from Contracts with Customers” (ASU 2014-09), outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance. In July 2015 the FASB decided to defer the effective date of ASU 2014-09 for entities reporting under U.S. GAAP from interim and annual reporting periods beginning after December 15, 2016 to interim and annual reporting periods beginning after December 15, 2017 and allow early adoption as of the original effective date. A full retrospective or modified retrospective approach may be taken to adopt the guidance in the ASU. The Company is evaluating the impact of the provisions of ASU 2014-09 on its consolidated financial position, results of operations and related disclosures.

In 2015 the FASB issued ASU 2015-10, “Technical Corrections and Improvements” (ASU 2015-10), which amends a wide range of topics in the FASB Accounting Standards Codification. The amendments make minor corrections or minor improvements to the Codification. The amendments in ASU 2015-10 that require transition guidance are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted, including adoption in an interim period. All other amendments are effective upon the issuance of ASU 2015-10. The Company has reviewed the amendments in ASU 2015-10 and has determined that the new guidance does not have a material impact on the Company’s financial reporting.

In July 2015 the FASB issued ASU 2015-11, “Simplifying the Measurement of Inventory” (ASU 2015-11), which requires entities 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. ASU 2015-11 is effective prospectively for annual periods beginning after December 15, 2016 and interim periods therein. Early application is permitted. The Company is reviewing the provisions of ASU 2015-11 and expects that the new guidance will not have a material impact on the Company’s financial reporting.

In August 2015 the FASB issued ASU 2015-15, “Interest – Imputation of Interest” (ASU 2015-15), which clarifies the Security and Exchange Commission staff’s position on presenting and measuring debt issuance costs incurred in connection with line-of-credit arrangements given the lack of guidance on this topic in ASU 2015-03. ASU 2015-15 was effective upon issuance. The Company has determined that the new guidance does not have a material impact on its financial reporting.

In September 2015 the FASB issued ASU 2015-16, “Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments” (ASU 2015-16), which simplifies the accounting for measurement-period adjustments. Under ASU 2015-16, an acquirer must recognize adjustments to provisional amounts that are identifiedduring the measurement period in the reporting period in which the adjustment amounts aredetermined. ASU 2015-16 also requires acquirers to present separately on the face of the income statement,or disclose in the notes, the portion of the amount recorded in current-period earnings by line item thatwould have been recorded in previous reporting periods if the adjustment to the provisional amountshad been recognized as of the acquisition date. ASU 2015-16 is effective for fiscal years beginning after December15, 2015, including interim periods within those fiscal years, and must be applied prospectively to adjustments to provisionalamounts that occur after the effective date. Early adoption is permitted for financial statements thathave not been issued. The Company will consider the new guidance in its accounting and financial reporting for acquisitions.

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Fair Value (Level 3 Fair Value Measurements Using Significant Other Unobservable Inputs for Derivative Instruments) (Details) - Significant Other Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 120	$ 350
Total (gains) losses included in earnings	57	(183)
Exercises	$ (177)	$ (47)
Reclassification from equity to liability when fully vested
Ending Balance		$ 120

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Commitments and Contingencies (Narrative) (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 01, 2015 USD ($)	Sep. 30, 2015 USD ($) ft²	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) ft² loan	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Commitments and Contingencies [Line Items]
Royalty expense		$ 423	$ 356	$ 1,321	$ 925
Subsequent Event [Member]
Commitments and Contingencies [Line Items]
Letter of credit to be issued to landlord	$ 1,250
Minimum [Member]
Commitments and Contingencies [Line Items]
Royalty rates				0.75%
Royalty payments, quarterly		50		$ 50
Royalty agreement term				3 years
Maximum [Member]
Commitments and Contingencies [Line Items]
Letter of credit required to landlord				$ 1,250
Royalty rates				5.00%
Royalty payments, quarterly		$ 2,000		$ 2,000
Royalty agreement term				20 years
Office, Manufacturing, Warehouse Facilities, And Equipment [Member]
Commitments and Contingencies [Line Items]
Operating leases expire at various terms				Dec. 31, 2030
Mason Lease [Member]
Commitments and Contingencies [Line Items]
Lease term period				15 years
Number of renewal options | loan				3
Lease renewal option period				5 years
Initial annual base rent				$ 1,353
Lease rate increase, percentage		2.00%		2.00%
Area of lease | ft²		92		92
Project cost included in the construction of building				$ 13,507		$ 3,941
Mason Lease [Member] | Leasehold Improvements [Member]
Commitments and Contingencies [Line Items]
Leases payable, amount		$ 750		$ 750

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 28,714	$ 28,384
Short-term investments	19,712	31,265
Accounts receivable, less allowance for doubtful accounts of $125 and $68, respectively	16,643	17,558
Inventories	16,567	14,257
Other current assets	2,477	2,044
Total current assets	84,113	93,508
Property and equipment, net	27,455	11,552
Long-term investments	10,381	8,894
Intangible assets, net	7,970	8,878
Goodwill	35,386	35,386
Other noncurrent assets	337	186
Total Assets	165,642	158,404
Current liabilities:
Accounts payable	11,174	7,621
Accrued liabilities	14,320	14,041
Other current liabilities and current maturities of capital leases	13,571	3,981
Total current liabilities	39,065	25,643
Capital leases	68	74
Other noncurrent liabilities	1,025	149
Total Liabilities	$ 40,158	$ 25,866
Commitments and contingencies (Note 7)
Stockholders' Equity:
Common stock, $0.001 par value, 90,000 shares authorized and 28,446 and 27,580 issued and outstanding, respectively	$ 28	$ 28
Additional paid-in capital	280,668	271,282
Accumulated other comprehensive loss	(490)	(348)
Accumulated deficit	(154,722)	(138,424)
Total Stockholders' Equity	125,484	132,538
Total Liabilities and Stockholders' Equity	$ 165,642	$ 158,404

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Segment and Geographic Information (Revenue by Product Type) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue from External Customer [Line Items]
Revenue	$ 31,423	$ 26,678	$ 93,892	$ 78,039
United States [Member]
Revenue from External Customer [Line Items]
Revenue	24,665	20,060	73,332	58,106
United States [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	13,041	11,265	39,043	32,498
United States [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	5,011	3,933	14,415	11,774
United States [Member] | AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	5,927	4,285	17,716	11,856
United States [Member] | Ablation and AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	23,979	19,483	71,174	56,128
United States [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue	686	577	2,158	1,978
International [Member]
Revenue from External Customer [Line Items]
Revenue	6,758	6,618	20,560	19,933
International [Member] | Open-heart Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	4,092	4,150	12,396	12,175
International [Member] | Minimally Invasive Ablation [Member]
Revenue from External Customer [Line Items]
Revenue	1,945	1,804	5,771	5,773
International [Member] | AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	598	543	2,058	1,390
International [Member] | Ablation and AtriClip [Member]
Revenue from External Customer [Line Items]
Revenue	6,635	6,497	20,225	19,338
International [Member] | Valve Tools [Member]
Revenue from External Customer [Line Items]
Revenue	$ 123	$ 121	$ 335	$ 595

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Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements of Cash Flows (Unaudited) [Abstract]
Offering cost for sale of stock	$ 0	$ 257

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Intangible Assets (Company's Intangible Assets with Definite Lives) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 10,379	$ 10,379
Accumulated Amortization	2,409	1,501
Non-Compete Agreement [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	100	100
Accumulated Amortization	100	93
Fusion Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	9,242	9,242
Accumulated Amortization	1,617	924
Clamp and Probe Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	829	829
Accumulated Amortization	484	276
Estech Trade Name [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	208	208
Accumulated Amortization	$ 208	$ 208

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Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2015

Intangible Assets [Abstract]

Company's Intangible Assets with Definite Lives

	September 30,				December 31,
	2015				2014
	Cost		Accumulated Amortization		Cost		Accumulated Amortization
Non-compete agreement	$	100	$	100	$	100	$	93
Fusion technology		9,242		1,617		9,242		924
Clamp & probe technology		829		484		829		276
Estech trade name		208		208		208		208
Total	$	10,379	$	2,409	$	10,379	$	1,501

Future Amortization Expense Related to Intangible Assets with Definite Lives

2015	$	300	October 1, 2015 through December 31, 2015
2016		1,201
2017		924
2018		924
2019		924
2020 and thereafter		3,697
Total	$	7,970

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Intangible Assets (Future Amortization Expense Related to Intangible Assets with Definite Lives) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Intangible Assets [Abstract]
Expected amortization expense October 1, 2015 through December 31, 2015	$ 300
Expected amortization expense in 2016	1,201
Expected amortization expense in 2017	924
Expected amortization expense in 2018	924
Expected amortization expense in 2019	924
Expected amortization expense in 2020 and thereafter	3,697
Total	$ 7,970	$ 8,878

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Indebtedness (Tables)

9 Months Ended

Sep. 30, 2015

Indebtedness [Abstract]

Future Maturities on Capital Lease Obligations

2015	$	14	October 1, 2015 through December 31, 2015
2016		55
2017		35
2018		21
2019		11
2020		4
Total payments	$	140
Imputed interest		(10)
Net capital lease obligations	$	130

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Description of Business and Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2015

Description of Business and Summary of Significant Accounting Policies [Abstract]

Description of Business and Summary of Significant Accounting Policies

1. DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of the Business— AtriCure, Inc. was incorporated in the State of Delaware on October 31, 2000. The “Company” or “AtriCure” consists of AtriCure, Inc. and its wholly-owned subsidiaries. The Company is aninnovator in surgical treatments for atrial fibrillation (Afib) and left atrial appendage management (LAAM). The Company sells its products to medical centers globally through a direct sales force and distributors.

Basis of Presentation—The accompanying interim financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (SEC). The accompanying interim financial statements are unaudited, but in the opinion of the Company’s management, contain all of the normal, recurring adjustments considered necessary to present fairly the financial position, results of operations and cash flows for the periods presented in conformity with accounting principles generally accepted in the United States of America (GAAP) applicable to interim periods. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with GAAP have been omitted or condensed. The Company believes the disclosures herein are adequate to make the information presented not misleading. Results of operations are not necessarily indicative of the results expected for the full fiscal year or for any future period.

The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the audited financial statements of the Company included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 filed with the SEC.

Principles of Consolidation—The Condensed Consolidated Financial Statements include the accounts of the Company, AtriCure, LLC, the Company’s wholly-owned subsidiary organized in the State of Delaware, Endoscopic Technologies, LLC, the Company’s wholly-owned subsidiary organized in the State of Delaware, and AtriCure Europe B.V. (AtriCure Europe), the Company’s wholly-owned subsidiary incorporated in the Netherlands. All intercompany accounts and transactions have been eliminated in consolidation.

Cash and Cash Equivalents—The Company considers highly liquid investments with maturities of three months or less at the date of acquisition as cash equivalents.

Investments—The Company places its investments primarily in U.S. Government agencies and securities, corporate bonds and commercial paper. The Company classifies all investments as available-for-sale. Investments with maturities of less than one year are classified as short-term investments. Investments are recorded at fair value, with unrealized gains and losses recorded as accumulated other comprehensive income (loss). The Company recognizes gains and losses when these securities are sold using the specific identification method and includes them in interest income or expense in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

Revenue Recognition—The Company accounts for revenue in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 605, “Revenue Recognition” (ASC 605). The Company recognizes revenue when all of the following criteria are met: (i) there is persuasive evidence that an arrangement exists; (ii) delivery of the products and/or services has occurred; (iii) the selling price is fixed or determinable; and (iv) collectability is reasonably assured.

Pursuant to the Company’s standard terms of sale, revenue is recognized when title to the goods and risk of loss transfers to customers and there are no remaining obligations that will affect the customers’ final acceptance of the sale. Generally, the Company’s standard terms of sale define the transfer of title and risk of loss to occur upon shipment to the respective customer. The Company generally does not maintain any post-shipping obligations to the recipients of the products. No installation, calibration or testing of products is performed by the Company subsequent to shipment to the customer in order to render it operational.

Revenue includes shipping and handling revenue of $260 and $236 for the three months ended September 30, 2015 and 2014, respectively, and $778 and $699 for the nine months ended September 30, 2015 and 2014, respectively. Cost of freight for shipments made to customers is included in cost of revenue. Sales and other value-added taxes collected from customers and remitted to governmental authorities are excluded from revenue. The Company sells its products primarily through a direct sales force, with certain international markets sold through distributors. Terms of sale are generally consistent for both end-users and distributors except that payment terms are generally net 30 days for end-users and net 60 days for distributors.

Sales Returns and Allowances—The Company maintains a provision for sales returns and allowances to account for potential returns of defective or damaged products, products shipped in error and invoice adjustments. The Company estimates such provision quarterly based primarily on a specific identification basis, in addition to estimating a general reserve. Increases to the provision result in a reduction of revenue. The provision is included in accrued liabilities in the Condensed Consolidated Balance Sheets.

Allowance for Doubtful Accounts Receivable—The Company evaluates the collectability of accounts receivable in order to determine the appropriate reserve for doubtful accounts. In determining the amount of the reserve, the Company considers aging of account balances, historical credit losses, customer-specific information and other relevant factors. An increase to the allowance for doubtful accounts results in a corresponding increase in expense. The Company reviews accounts receivable and adjusts the allowance based on current circumstances and charges off uncollectible receivables against the allowance when all attempts to collect the receivable have failed. The Company’s history of write-offs against the allowance has not been significant.

Inventories—Inventories are stated at the lower of cost or market using approximate costs based on the first-in, first-out cost method (FIFO) and consist of raw materials, work in process and finished goods. The Company’s industry is characterized by rapid product development and frequent new product introductions. Uncertain timing of product approvals, variability in product launch strategies and variation in product utilization all impact excess and obsolete inventory. An inventory allowance based on product usage is estimated and recorded quarterly for excess, slow moving and obsolete inventory, as well as inventory with a carrying value in excess of its net realizable value. Write-offs are recorded when a product is destroyed. The Company’s history of write-offs against the allowance has not been significant.

Inventories consist of the following:

	September 30,		December 31,
	2015		2014
Raw materials	$	5,371	$	4,429
Work in process		1,013		1,397
Finished goods		10,183		8,431
Inventories	$	16,567	$	14,257

Property and Equipment—Property and equipment is stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method of depreciation for financial reporting purposes and applied over the estimated useful lives of the assets. The estimated useful life by major asset category is the following: generators and other capital equipment, machinery, equipment and vehicles is three to seven years, computer and other office equipment is three years, furniture and fixtures is three to seven years and leasehold improvements and equipment leased under a capital lease are the shorter of their useful life or remaining lease term. The Company reassesses the useful lives of property and equipment annually, and assets are retired if they are no longer in service. Maintenance and repair costs are expensed as incurred.

Generators and other capital equipment (such as the Company’s switchbox units and cryosurgical consoles) are loaned at no cost to direct customers that use the Company’s disposable products. Depreciation of such assets is included in cost of revenue. The estimated useful lives of this equipment are based on anticipated usage by customers and the timing and impact of expected new technology rollouts by the Company. To the extent the Company experiences changes in the usage of this equipment or introduces new technologies, the estimated useful lives of the equipment may change in a future period. Depreciation related to these generators was $733 and $593 for the three months ended September 30, 2015 and 2014, respectively, and $2,026 and $1,552 for the nine months ended September 30, 2015 and 2014, respectively. As of September 30, 2015 and December 31, 2014, the net carrying amount of loaned equipment included in net property and equipment in the Condensed Consolidated Balance Sheets was $5,237 and $4,141, respectively.

The Company reviews property and equipment for impairment using its best estimates based on reasonable and supportable assumptions and projections.

Intangible Assets—Intangible assets with determinable useful lives are amortized on a straight-line basis over the estimated periods benefited. The Company reviews intangible assets for impairment using its best estimates based on reasonable and supportable assumptions and projections.

Goodwill— Goodwill represents the excess of purchase price over the fair value of the net assets acquired in business combinations. The Company tests goodwill for impairment annually on November 30, or more often if impairment indicators are present. The Company’s goodwill is accounted for in a single reporting unit representing the Company as a whole.

Other Current Liabilities and Current Maturities of Capital Leases—Other current liabilities consist of a financing obligation related to the construction of the Company’s new headquarters (see Note 7 – Commitments and Contingencies). Current maturities of capital leases consist of capital lease obligations with maturities of less than one year (see Note 6 – Indebtedness).

Other Income—Other income consists primarily of foreign currency transaction gains and losses, grant income and non-employee option gains and losses related to the fair market value change for fully vested options outstanding for consultants which are accounted for as free-standing derivatives.

The Company recorded net foreign currency transaction gains (losses) of $(48) and ($51) for the three months ended September 30, 2015 and 2014, respectively, and $(257) and ($30) for the nine months ended September 30, 2015 and 2014, respectively, in connection with settlements of its intercompany balance with AtriCure Europe and invoices transacted in British Pounds.

The Company periodically is awarded grants to support research and development activities or education activities. The Company recognizes grant income when the funds are earned. The Company recorded grant income of $0 and $231 during the three months ended September 30, 2015 and 2014, respectively. Grant income of $35 and $731 was recorded for the nine months ended September 30, 2015 and 2014, respectively.

The Company historically issued stock options to non-employee consultants as a form of compensation for services provided to the Company. Because the non-employee options require settlement by the Company’s delivery of registered shares and because the tax withholding provisions in the awards allow the options to be partially net-cash settled, these options, when vested, are no longer eligible for equity classification and are, thus, subsequently accounted for as derivative liabilities under FASB ASC 815, “Derivatives and Hedging” (ASC 815) until the awards are ultimately either exercised or forfeited. Accordingly, the vested non-employee options are classified as liabilities and remeasured at fair value through earnings at each reporting period. All vested non-employee options have been exercised as of September 30, 2015. During the three months ended September 30, 2015 and 2014,  $0 and $158, respectively, of income was recorded as a result of the remeasurement of the fair value of these fully vested stock options. During the nine months ended September 30, 2015 and 2014,  $(57) and $275, respectively, of (expense) income was recorded as a result of the remeasurement of the fair value of these fully vested stock options.

Taxes— Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rates is recognized in the period that includes the enactment date.

The Company’s estimate of the valuation allowance for deferred tax assets requires it to make significant estimates and judgments about its future operating results. Deferred tax assets are reduced by valuation allowances if, based on the consideration of all available evidence, it is more-likely-than-not that some portion of the deferred tax asset will not be realized. Significant weight is given to evidence that can be objectively verified. The Company evaluates deferred tax assets on a quarterly basis to determine if valuation allowances are required by considering all available evidence. Deferred tax assets are realized by having sufficient future taxable income to allow the related tax benefits to reduce taxes otherwise payable. The sources of taxable income that may be available to realize the benefit of deferred tax assets are future reversals of existing taxable temporary differences, future taxable income, exclusive of reversing temporary differences and carryforwards, taxable income in carry-back years and tax planning strategies that are both prudent and feasible. In evaluating whether to record a valuation allowance, the applicable accounting standards deem that the existence of cumulative losses in recent years is a significant piece of objectively verifiable negative evidence that must be overcome by objectively verifiable positive evidence to avoid the need to record a valuation allowance. The Company has recorded a full valuation allowance against its net deferred tax assets as it is more-likely-than-not that the benefit of the deferred tax assets will not be recognized in future periods.

A provision of The Patient Protection and Affordable Care Act enacted in 2010, as amended (Affordable Care Act), requires manufacturers of medical devices to pay an excise tax on all U.S. medical device sales. The Company’s expense related to the medical device excise tax, which was recorded in cost of revenue, was $164 and $204 for the three months ended September 30, 2015 and 2014, respectively, and $468 and $434 for the nine months ended September 30, 2015 and 2014, respectively.

Net Loss Per Share—Basic and diluted net loss per share is computed in accordance with FASB ASC 260, “Earnings Per Share” (ASC 260) by dividing the net loss by the weighted average number of common shares outstanding during the period. Since the Company has experienced net losses for all periods presented, net loss per share excludes the effect of 4,243 and 3,782 options and restricted stock shares as of September 30, 2015 and 2014, respectively, because they are anti-dilutive. Therefore the number of shares calculated for basic net loss per share is also used for the diluted net loss per share calculation.

Comprehensive Loss and Accumulated Other Comprehensive Loss—In addition to net losses, the comprehensive loss includes foreign currency translation adjustments and unrealized gains and losses on investments.

Accumulated other comprehensive income (loss) consisted of the following:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Total accumulated other comprehensive (loss) income at   beginning of period	$	(543)	$	(178)	$	(348)	$	(139)
Unrealized Gains on Investments
Balance at beginning of period	$	(15)	$	(19)	$	(54)	$	(6)
Other comprehensive income (loss) before reclassifications		17		(20)		56		(33)
Amounts reclassified from accumulated other comprehensive   income to other income on the statement of operations		—		—		—		—
Balance at end of period	$	2	$	(39)	$	2	$	(39)
Foreign Currency Translation Adjustment
Balance at beginning of period	$	(528)	$	(159)	$	(294)	$	(133)
Other comprehensive income (loss) before reclassifications		67		(339)		135		(386)
Amounts reclassified from accumulated other comprehensive   income to other income on the statement of operations		(31)		(51)		(333)		(30)
Balance at end of period	$	(492)	$	(549)	$	(492)	$	(549)
Total accumulated other comprehensive loss at end of period	$	(490)	$	(588)	$	(490)	$	(588)

Research and Development—Research and development costs are expensed as incurred. These costs include compensation and other internal and external costs associated with the development and research related to new and existing products or concepts, preclinical studies, clinical trials, healthcare compliance and regulatory affairs.

Advertising Costs— The Company expenses advertising costs as incurred. Advertising costs were not significant during the three and nine months ended September 30, 2015 and 2014.

Share-Based Compensation—The Company follows FASB ASC 718, “Compensation-Stock Compensation” (ASC 718) to record share-based compensation for all employee share-based payment awards, including stock options, restricted stock, performance shares and stock purchases related to an employee stock purchase plan, based on estimated fair values. The Company’s share-based compensation expense recognized under ASC 718 for the three months ended September 30, 2015 and 2014 was $2,392 and $1,716, respectively, and $6,533 and $5,704 for the nine months ended September 30, 2015 and 2014, respectively, on a before and after tax basis.

FASB ASC 718 requires companies to estimate the fair value of share-based payment awards on the date of grant using an option-pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service periods in the Company’s Condensed Consolidated Statement of Operations and Comprehensive Loss. The expense has been reduced for estimated forfeitures. FASB ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

The Company estimates the fair value of time-based options on the date of grant using the Black-Scholes option-pricing model (Black-Scholes model). The Company’s determination of fair value of share-based payment awards on the date of grant using an option-pricing model is affected by the Company’s stock price, as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility over the term of the awards and actual and projected employee stock option exercise behaviors. The fair value of market-based performance option grants is estimated at the date of grant using a Monte-Carlo simulation. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service periods in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

The Company estimates the fair value of restricted stock based upon the grant date closing market price of the Company’s common stock. The Company’s determination of fair value is affected by the Company’s stock price as well as assumptions regarding the number of shares expected to be granted.

The Company also has an employee stock purchase plan (ESPP or the Plan) which is available to all eligible employees as defined by the Plan. Under the ESPP, shares of the Company’s common stock may be purchased at a discount. The Company estimates the number of shares to be purchased under the Plan and records compensation expense based upon the fair value of the stock at the beginning of the purchase period using the Black-Scholes model.

Use of Estimates—The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.

Fair Value Disclosures—The Company classifies and records cash and investments in U.S. government agencies and securities as Level 1 within the fair value hierarchy. Accounts receivable, short-term other assets, accounts payable and accrued liabilities are also classified as Level 1. The carrying amounts of these assets and liabilities approximate their fair value due to their relatively short-term nature. Cash equivalents and investments in commercial paper are classified as Level 2 within the fair value hierarchy (see Note 3 – Fair Value for further information). Significant unobservable inputs with respect to the fair value measurement of the Level 3 non-employee stock options are developed using Company data. When an input is changed, the Black-Scholes model is updated and the results are analyzed for reasonableness.

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Condensed Consolidated Balance Sheets (Unaudited) [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 125	$ 68
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	90,000,000	90,000,000
Common stock, shares issued	28,446,000	27,580,000
Common stock, shares outstanding	28,446,000	27,580,000

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Public Offerings of Common Stock

9 Months Ended

Sep. 30, 2015

Public Offerings of Common Stock [Abstract]

Public Offerings of Common Stock

11. PUBLIC OFFERINGS OF COMMON STOCK

In February 2014 the Company completed a public offering of common stock under its January 2014 shelf registration. The Company sold 3,661 shares of common stock, par value $0.001 per share, at a price of $19.25 per share, generating proceeds of $65,830 after expenses. Offering costs were recorded in additional paid in capital to offset proceeds.

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 28, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q3
Trading Symbol	ATRC
Entity Registrant Name	AtriCure, Inc.
Entity Central Index Key	0001323885
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		32,216,424

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Subsequent Events

9 Months Ended

Sep. 30, 2015

Subsequent Event [Abstract]

Subsequent Events [Text Block]

12. SUBSEQUENT EVENT

On October 13, 2015 the Company acquired nContact Surgical, Inc. (nContact) pursuant to a merger agreement. The Company acquired 100% of the voting equity interests of nContact. The transaction consideration consists of an upfront payment of 3,757 shares of AtriCure common stock and approximately $7,600 in cash, subject to closing adjustments. The transaction also includes up to $50,000 in additional contingent consideration based on completion of enrollment of the CONVERGE IDE trial and PMA approval by December 31, 2020. Additionally, nContact shareholders are entitled to additional sales-based contingent consideration on revenue in excess of an annual growth rate of more than 25% through 2019. Subject to the terms and conditions of the merger agreement, all contingent consideration can be paid in either cash or AtriCure common stock, or a combination of both, at the Company’s discretion.

The product portfolio acquired includes innovative devices that provide for less invasive ablation options for the treatment of cardiac arrhythmias.The Company expects the combined entity to offer improved market access and additional collaboration opportunities with cardiac surgeons and electrophysiologists. The initial accounting for this acquisition is expected to be completed during the fourth quarter of 2015. Transaction expenses of approximately $526 were recorded as a part of selling, general and administrative expenses during the three and nine months ended September 30, 2015.

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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) [Abstract]
Revenue	$ 31,423	$ 26,678	$ 93,892	$ 78,039
Cost of revenue	8,945	7,786	26,562	22,709
Gross profit	22,478	18,892	67,330	55,330
Operating expenses:
Research and development expenses	6,504	5,033	17,975	13,603
Selling, general and administrative expenses	22,101	14,662	65,445	53,308
Total operating expenses	28,605	19,695	83,420	66,911
Loss from operations	(6,127)	(803)	(16,090)	(11,581)
Other income (expense):
Interest expense	(16)	(24)	(51)	(290)
Interest income	56	27	142	64
Other	(48)	338	(279)	976
Loss before income tax expense	(6,135)	(462)	(16,278)	(10,831)
Income tax expense	6	4	20	36
Net loss	$ (6,141)	$ (466)	$ (16,298)	$ (10,867)
Basic and diluted net loss per share	$ (0.22)	$ (0.02)	$ (0.60)	$ (0.42)
Weighted average shares outstanding-basic and diluted	27,462	26,915	27,190	26,185
Comprehensive loss:
Unrealized gains (losses) on investments	$ 17	$ (20)	$ 56	$ (33)
Foreign currency translation adjustment	36	(390)	(198)	(416)
Other comprehensive income (loss)	53	(410)	(142)	(449)
Net loss	(6,141)	(466)	(16,298)	(10,867)
Comprehensive loss	$ (6,088)	$ (876)	$ (16,440)	$ (11,316)

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Indebtedness

9 Months Ended

Sep. 30, 2015

Indebtedness [Abstract]

Indebtedness

6. INDEBTEDNESS

The Company has a debt agreement with Silicon Valley Bank (SVB). The agreement, as amended, restated and modified, includes a $15,000 revolving credit facility which matures on April 30, 2018. Borrowing availability under the revolving credit facility is based on the lesser of $15,000 or a borrowing base calculation as defined by the agreement. As of September 30, 2015 the Company had no borrowings under the revolving credit facility and had borrowing availability of $13,292.

Effective March 31, 2015, the Company and SVB entered into an Eighth Loan Modification Agreement (Loan Modification Agreement) which sets forth certain amendments to the Company’s credit facility. The Loan Modification Agreement provides for (i) an increase in the limit of outstanding letters of credit from $1,000 to $2,000, (ii) an extension of the revolving line maturity date from April 30, 2016 to April 30, 2018 and (iii) modifications to certain covenants and other terms of the agreement.

As of December 31, 2014 the Company had an outstanding letter of credit of €75 issued to its European subsidiary’s corporate credit card program provider which was due to expire on June 30, 2015. The letter of credit was cancelled in June 2015.

As of September 30, 2015 the Company had capital leases for computer and office equipment that expire at various terms through 2020. The cost of the assets under lease was $212. The assets are depreciated over their estimated useful lives, which equal the terms of the leases. Accumulated amortization on the capital leases was $99 at September 30, 2015.

Future maturities on capital lease obligations are projected as follows:

2015	$	14	October 1, 2015 through December 31, 2015
2016		55
2017		35
2018		21
2019		11
2020		4
Total payments	$	140
Imputed interest		(10)
Net capital lease obligations	$	130

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Accrued Liabilities

9 Months Ended

Sep. 30, 2015

Accrued Liabilities [Abstract]

Accrued Liabilities

5. ACCRUED LIABILITIES

Accrued liabilities consisted of the following:

	September 30,		December 31,
	2015		2014
Accrued bonus	$	5,082	$	4,915
Accrued commissions		4,526		4,477
Accrued payroll and employee-related expenses		3,195		2,281
Accrued taxes and value-added taxes payable		725		1,272
Accrued royalties		361		442
Other accrued liabilities		298		399
Sales returns allowance		133		135
Accrued non-employee stock options		—		120
Total	$	14,320	$	14,041

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Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2015

Accrued Liabilities [Abstract]

Accrued Liabilities

	September 30,		December 31,
	2015		2014
Accrued bonus	$	5,082	$	4,915
Accrued commissions		4,526		4,477
Accrued payroll and employee-related expenses		3,195		2,281
Accrued taxes and value-added taxes payable		725		1,272
Accrued royalties		361		442
Other accrued liabilities		298		399
Sales returns allowance		133		135
Accrued non-employee stock options		—		120
Total	$	14,320	$	14,041

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Description of Business and Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2015

Description of Business and Summary of Significant Accounting Policies [Abstract]

Nature of the Business

Nature of the Business— AtriCure, Inc. was incorporated in the State of Delaware on October 31, 2000. The “Company” or “AtriCure” consists of AtriCure, Inc. and its wholly-owned subsidiaries. The Company is aninnovator in surgical treatments for atrial fibrillation (Afib) and left atrial appendage management (LAAM). The Company sells its products to medical centers globally through a direct sales force and distributors.

Basis of Presentation

Basis of Presentation—The accompanying interim financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (SEC). The accompanying interim financial statements are unaudited, but in the opinion of the Company’s management, contain all of the normal, recurring adjustments considered necessary to present fairly the financial position, results of operations and cash flows for the periods presented in conformity with accounting principles generally accepted in the United States of America (GAAP) applicable to interim periods. Certain information and footnote disclosures normally included in annual financial statements prepared in accordance with GAAP have been omitted or condensed. The Company believes the disclosures herein are adequate to make the information presented not misleading. Results of operations are not necessarily indicative of the results expected for the full fiscal year or for any future period.

The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the audited financial statements of the Company included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 filed with the SEC.

Principles of Consolidation

Principles of Consolidation—The Condensed Consolidated Financial Statements include the accounts of the Company, AtriCure, LLC, the Company’s wholly-owned subsidiary organized in the State of Delaware, Endoscopic Technologies, LLC, the Company’s wholly-owned subsidiary organized in the State of Delaware, and AtriCure Europe B.V. (AtriCure Europe), the Company’s wholly-owned subsidiary incorporated in the Netherlands. All intercompany accounts and transactions have been eliminated in consolidation.

Cash and Cash Equivalents

Cash and Cash Equivalents—The Company considers highly liquid investments with maturities of three months or less at the date of acquisition as cash equivalents.

Investments

Investments—The Company places its investments primarily in U.S. Government agencies and securities, corporate bonds and commercial paper. The Company classifies all investments as available-for-sale. Investments with maturities of less than one year are classified as short-term investments. Investments are recorded at fair value, with unrealized gains and losses recorded as accumulated other comprehensive income (loss). The Company recognizes gains and losses when these securities are sold using the specific identification method and includes them in interest income or expense in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

Revenue Recognition

Revenue Recognition—The Company accounts for revenue in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 605, “Revenue Recognition” (ASC 605). The Company recognizes revenue when all of the following criteria are met: (i) there is persuasive evidence that an arrangement exists; (ii) delivery of the products and/or services has occurred; (iii) the selling price is fixed or determinable; and (iv) collectability is reasonably assured.

Pursuant to the Company’s standard terms of sale, revenue is recognized when title to the goods and risk of loss transfers to customers and there are no remaining obligations that will affect the customers’ final acceptance of the sale. Generally, the Company’s standard terms of sale define the transfer of title and risk of loss to occur upon shipment to the respective customer. The Company generally does not maintain any post-shipping obligations to the recipients of the products. No installation, calibration or testing of products is performed by the Company subsequent to shipment to the customer in order to render it operational.

Revenue includes shipping and handling revenue of $260 and $236 for the three months ended September 30, 2015 and 2014, respectively, and $778 and $699 for the nine months ended September 30, 2015 and 2014, respectively. Cost of freight for shipments made to customers is included in cost of revenue. Sales and other value-added taxes collected from customers and remitted to governmental authorities are excluded from revenue. The Company sells its products primarily through a direct sales force, with certain international markets sold through distributors. Terms of sale are generally consistent for both end-users and distributors except that payment terms are generally net 30 days for end-users and net 60 days for distributors.

Sales Returns and Allowances

Sales Returns and Allowances—The Company maintains a provision for sales returns and allowances to account for potential returns of defective or damaged products, products shipped in error and invoice adjustments. The Company estimates such provision quarterly based primarily on a specific identification basis, in addition to estimating a general reserve. Increases to the provision result in a reduction of revenue. The provision is included in accrued liabilities in the Condensed Consolidated Balance Sheets.

Allowance for Doubtful Accounts Receivable

Allowance for Doubtful Accounts Receivable—The Company evaluates the collectability of accounts receivable in order to determine the appropriate reserve for doubtful accounts. In determining the amount of the reserve, the Company considers aging of account balances, historical credit losses, customer-specific information and other relevant factors. An increase to the allowance for doubtful accounts results in a corresponding increase in expense. The Company reviews accounts receivable and adjusts the allowance based on current circumstances and charges off uncollectible receivables against the allowance when all attempts to collect the receivable have failed. The Company’s history of write-offs against the allowance has not been significant.

Inventories

Inventories—Inventories are stated at the lower of cost or market using approximate costs based on the first-in, first-out cost method (FIFO) and consist of raw materials, work in process and finished goods. The Company’s industry is characterized by rapid product development and frequent new product introductions. Uncertain timing of product approvals, variability in product launch strategies and variation in product utilization all impact excess and obsolete inventory. An inventory allowance based on product usage is estimated and recorded quarterly for excess, slow moving and obsolete inventory, as well as inventory with a carrying value in excess of its net realizable value. Write-offs are recorded when a product is destroyed. The Company’s history of write-offs against the allowance has not been significant.

Inventories consist of the following:

	September 30,		December 31,
	2015		2014
Raw materials	$	5,371	$	4,429
Work in process		1,013		1,397
Finished goods		10,183		8,431
Inventories	$	16,567	$	14,257

Property and Equipment

Property and Equipment—Property and equipment is stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method of depreciation for financial reporting purposes and applied over the estimated useful lives of the assets. The estimated useful life by major asset category is the following: generators and other capital equipment, machinery, equipment and vehicles is three to seven years, computer and other office equipment is three years, furniture and fixtures is three to seven years and leasehold improvements and equipment leased under a capital lease are the shorter of their useful life or remaining lease term. The Company reassesses the useful lives of property and equipment annually, and assets are retired if they are no longer in service. Maintenance and repair costs are expensed as incurred.

Generators and other capital equipment (such as the Company’s switchbox units and cryosurgical consoles) are loaned at no cost to direct customers that use the Company’s disposable products. Depreciation of such assets is included in cost of revenue. The estimated useful lives of this equipment are based on anticipated usage by customers and the timing and impact of expected new technology rollouts by the Company. To the extent the Company experiences changes in the usage of this equipment or introduces new technologies, the estimated useful lives of the equipment may change in a future period. Depreciation related to these generators was $733 and $593 for the three months ended September 30, 2015 and 2014, respectively, and $2,026 and $1,552 for the nine months ended September 30, 2015 and 2014, respectively. As of September 30, 2015 and December 31, 2014, the net carrying amount of loaned equipment included in net property and equipment in the Condensed Consolidated Balance Sheets was $5,237 and $4,141, respectively.

The Company reviews property and equipment for impairment using its best estimates based on reasonable and supportable assumptions and projections.

Intangible Assets

Intangible Assets—Intangible assets with determinable useful lives are amortized on a straight-line basis over the estimated periods benefited. The Company reviews intangible assets for impairment using its best estimates based on reasonable and supportable assumptions and projections.

Goodwill

Goodwill— Goodwill represents the excess of purchase price over the fair value of the net assets acquired in business combinations. The Company tests goodwill for impairment annually on November 30, or more often if impairment indicators are present. The Company’s goodwill is accounted for in a single reporting unit representing the Company as a whole.

Other Current Liabilities and Current Maturities of Capital Leases

Other Current Liabilities and Current Maturities of Capital Leases—Other current liabilities consist of a financing obligation related to the construction of the Company’s new headquarters (see Note 7 – Commitments and Contingencies). Current maturities of capital leases consist of capital lease obligations with maturities of less than one year (see Note 6 – Indebtedness).

Other Income

Other Income—Other income consists primarily of foreign currency transaction gains and losses, grant income and non-employee option gains and losses related to the fair market value change for fully vested options outstanding for consultants which are accounted for as free-standing derivatives.

The Company recorded net foreign currency transaction gains (losses) of $(48) and ($51) for the three months ended September 30, 2015 and 2014, respectively, and $(257) and ($30) for the nine months ended September 30, 2015 and 2014, respectively, in connection with settlements of its intercompany balance with AtriCure Europe and invoices transacted in British Pounds.

The Company periodically is awarded grants to support research and development activities or education activities. The Company recognizes grant income when the funds are earned. The Company recorded grant income of $0 and $231 during the three months ended September 30, 2015 and 2014, respectively. Grant income of $35 and $731 was recorded for the nine months ended September 30, 2015 and 2014, respectively.

The Company historically issued stock options to non-employee consultants as a form of compensation for services provided to the Company. Because the non-employee options require settlement by the Company’s delivery of registered shares and because the tax withholding provisions in the awards allow the options to be partially net-cash settled, these options, when vested, are no longer eligible for equity classification and are, thus, subsequently accounted for as derivative liabilities under FASB ASC 815, “Derivatives and Hedging” (ASC 815) until the awards are ultimately either exercised or forfeited. Accordingly, the vested non-employee options are classified as liabilities and remeasured at fair value through earnings at each reporting period. All vested non-employee options have been exercised as of September 30, 2015. During the three months ended September 30, 2015 and 2014,  $0 and $158, respectively, of income was recorded as a result of the remeasurement of the fair value of these fully vested stock options. During the nine months ended September 30, 2015 and 2014,  $(57) and $275, respectively, of (expense) income was recorded as a result of the remeasurement of the fair value of these fully vested stock options.

Taxes

Taxes— Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities from a change in tax rates is recognized in the period that includes the enactment date.

The Company’s estimate of the valuation allowance for deferred tax assets requires it to make significant estimates and judgments about its future operating results. Deferred tax assets are reduced by valuation allowances if, based on the consideration of all available evidence, it is more-likely-than-not that some portion of the deferred tax asset will not be realized. Significant weight is given to evidence that can be objectively verified. The Company evaluates deferred tax assets on a quarterly basis to determine if valuation allowances are required by considering all available evidence. Deferred tax assets are realized by having sufficient future taxable income to allow the related tax benefits to reduce taxes otherwise payable. The sources of taxable income that may be available to realize the benefit of deferred tax assets are future reversals of existing taxable temporary differences, future taxable income, exclusive of reversing temporary differences and carryforwards, taxable income in carry-back years and tax planning strategies that are both prudent and feasible. In evaluating whether to record a valuation allowance, the applicable accounting standards deem that the existence of cumulative losses in recent years is a significant piece of objectively verifiable negative evidence that must be overcome by objectively verifiable positive evidence to avoid the need to record a valuation allowance. The Company has recorded a full valuation allowance against its net deferred tax assets as it is more-likely-than-not that the benefit of the deferred tax assets will not be recognized in future periods.

A provision of The Patient Protection and Affordable Care Act enacted in 2010, as amended (Affordable Care Act), requires manufacturers of medical devices to pay an excise tax on all U.S. medical device sales. The Company’s expense related to the medical device excise tax, which was recorded in cost of revenue, was $164 and $204 for the three months ended September 30, 2015 and 2014, respectively, and $468 and $434 for the nine months ended September 30, 2015 and 2014, respectively.

Net Loss Per Share

Net Loss Per Share—Basic and diluted net loss per share is computed in accordance with FASB ASC 260, “Earnings Per Share” (ASC 260) by dividing the net loss by the weighted average number of common shares outstanding during the period. Since the Company has experienced net losses for all periods presented, net loss per share excludes the effect of 4,243 and 3,782 options and restricted stock shares as of September 30, 2015 and 2014, respectively, because they are anti-dilutive. Therefore the number of shares calculated for basic net loss per share is also used for the diluted net loss per share calculation.

Comprehensive Loss and Accumulated Other Comprehensive Loss

Comprehensive Loss and Accumulated Other Comprehensive Loss—In addition to net losses, the comprehensive loss includes foreign currency translation adjustments and unrealized gains and losses on investments.

Accumulated other comprehensive income (loss) consisted of the following:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Total accumulated other comprehensive (loss) income at   beginning of period	$	(543)	$	(178)	$	(348)	$	(139)
Unrealized Gains on Investments
Balance at beginning of period	$	(15)	$	(19)	$	(54)	$	(6)
Other comprehensive income (loss) before reclassifications		17		(20)		56		(33)
Amounts reclassified from accumulated other comprehensive   income to other income on the statement of operations		—		—		—		—
Balance at end of period	$	2	$	(39)	$	2	$	(39)
Foreign Currency Translation Adjustment
Balance at beginning of period	$	(528)	$	(159)	$	(294)	$	(133)
Other comprehensive income (loss) before reclassifications		67		(339)		135		(386)
Amounts reclassified from accumulated other comprehensive   income to other income on the statement of operations		(31)		(51)		(333)		(30)
Balance at end of period	$	(492)	$	(549)	$	(492)	$	(549)
Total accumulated other comprehensive loss at end of period	$	(490)	$	(588)	$	(490)	$	(588)

Research and Development

Research and Development—Research and development costs are expensed as incurred. These costs include compensation and other internal and external costs associated with the development and research related to new and existing products or concepts, preclinical studies, clinical trials, healthcare compliance and regulatory affairs.

Advertising Costs

Advertising Costs— The Company expenses advertising costs as incurred. Advertising costs were not significant during the three and nine months ended September 30, 2015 and 2014.

Share-Based Compensation

Share-Based Compensation—The Company follows FASB ASC 718, “Compensation-Stock Compensation” (ASC 718) to record share-based compensation for all employee share-based payment awards, including stock options, restricted stock, performance shares and stock purchases related to an employee stock purchase plan, based on estimated fair values. The Company’s share-based compensation expense recognized under ASC 718 for the three months ended September 30, 2015 and 2014 was $2,392 and $1,716, respectively, and $6,533 and $5,704 for the nine months ended September 30, 2015 and 2014, respectively, on a before and after tax basis.

FASB ASC 718 requires companies to estimate the fair value of share-based payment awards on the date of grant using an option-pricing model. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service periods in the Company’s Condensed Consolidated Statement of Operations and Comprehensive Loss. The expense has been reduced for estimated forfeitures. FASB ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

The Company estimates the fair value of time-based options on the date of grant using the Black-Scholes option-pricing model (Black-Scholes model). The Company’s determination of fair value of share-based payment awards on the date of grant using an option-pricing model is affected by the Company’s stock price, as well as assumptions regarding a number of subjective variables. These variables include, but are not limited to, the Company’s expected stock price volatility over the term of the awards and actual and projected employee stock option exercise behaviors. The fair value of market-based performance option grants is estimated at the date of grant using a Monte-Carlo simulation. The value of the portion of the award that is ultimately expected to vest is recognized as expense over the requisite service periods in the Condensed Consolidated Statements of Operations and Comprehensive Loss.

The Company estimates the fair value of restricted stock based upon the grant date closing market price of the Company’s common stock. The Company’s determination of fair value is affected by the Company’s stock price as well as assumptions regarding the number of shares expected to be granted.

The Company also has an employee stock purchase plan (ESPP or the Plan) which is available to all eligible employees as defined by the Plan. Under the ESPP, shares of the Company’s common stock may be purchased at a discount. The Company estimates the number of shares to be purchased under the Plan and records compensation expense based upon the fair value of the stock at the beginning of the purchase period using the Black-Scholes model.

Use of Estimates

Use of Estimates—The preparation of the financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expense during the reporting period. Actual results could differ from those estimates.

Fair Value Disclosures

Fair Value Disclosures—The Company classifies and records cash and investments in U.S. government agencies and securities as Level 1 within the fair value hierarchy. Accounts receivable, short-term other assets, accounts payable and accrued liabilities are also classified as Level 1. The carrying amounts of these assets and liabilities approximate their fair value due to their relatively short-term nature. Cash equivalents and investments in commercial paper are classified as Level 2 within the fair value hierarchy (see Note 3 – Fair Value for further information). Significant unobservable inputs with respect to the fair value measurement of the Level 3 non-employee stock options are developed using Company data. When an input is changed, the Black-Scholes model is updated and the results are analyzed for reasonableness.

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Equity Compensation Plans

9 Months Ended

Sep. 30, 2015

Equity Compensation Plans [Abstract]

Equity Compensation Plans

9. EQUITY COMPENSATION PLANS

The Company has several share-based incentive plans: the 2001 Stock Option Plan (2001 Plan), the 2005 Equity Incentive Plan (2005 Plan), the Amended and Restated 2014 Stock Incentive Plan (2014 Plan) and the 2008 Employee Stock Purchase Plan (ESPP).

2001 Plan, 2005 Plan and 2014 Plan

Neither the 2001 Plan nor 2005 Plan is currently used for granting incentives. The Company granted awards under the 2005 Plan until the 2014 Annual Meeting of Stockholders at which stockholders adopted the 2014 Plan. Pursuant to its terms, the 2014 Plan supersedes and replaces the 2005 Plan. Under the 2014 Plan, the Board of Directors may grant incentive stock options to employees and any parent or subsidiary’s employees, and may grant nonstatutory stock options, restricted stock or stock appreciation rights to employees, directors and consultants of the Company and any parent or subsidiary’s employees, directors and consultants. The administrator (currently the Compensation Committee of the Board of Directors) has the power to determine the terms of any awards, including the number of shares subject to each award, the exercisability of the awards and the form of consideration. As of September 30, 2015,  8,949 shares of common stock had been reserved for issuance under the 2014 Plan.

Options granted under the plans generally expire tenyears from the date of grant. Options granted from the 2005 Plan and 2014 Plan generally vest at a rate of 25% on the first anniversary date of the grant and ratably each month thereafter over the following threeyears. Restricted stock awards granted under the 2005 Plan and 2014 Plan generally vest 25% annually over four years from date of grant.

Employee Stock Purchase Plan (ESPP)

During 2008 the Company established the Employee Stock Purchase Plan which is available to eligible employees as defined in the ESPP. Under the ESPP, shares of the Company’s common stock may be purchased at a discount (currently 15%) of the lesser of the closing price of the Company’s common stock on the first trading day or the last trading day of the offering period. The offering period (currently six months) and the offering price are subject to change. Participants may not purchase more than $25 of the Company’s common stock in a calendar year and, effective January 1, 2014, may not purchase more than 3 shares during an offering period. Beginning on January 1, 2009 and on the first day of each fiscal year thereafter during the term of the ESPP, the number of shares available for sale under the ESPP shall be increased by the lesser of (i) two percent (2%) of the Company’s outstanding shares of common stock as of the close of business on the last business day of the prior calendar year, not to exceed 600 shares, or (ii) a lesser amount determined by the Board of Directors. At September 30, 2015 there were 524 shares available for future issuance under the ESPP.

Expense Information Under FASB ASC 718

The following table summarizes share-based compensation expense related to employee share-based compensation under FASB ASC 718 for the three and nine months ended September 30, 2015 and 2014. This expense was allocated as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Cost of revenue	$	112	$	86	$	308	$	250
Research and development expenses		374		276		1,010		675
Selling, general and administrative expenses		1,906		1,354		5,215		4,779
Total share-based compensation expense related to   employees	$	2,392	$	1,716	$	6,533	$	5,704

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2015

Commitments and Contingencies [Abstract]

Commitments and Contingencies

7. COMMITMENTS AND CONTINGENCIES

Lease Commitments

The Company leases various types of office, manufacturing and warehouse facilities and equipment under noncancelable operating leases that expire at various terms through 2030.  

In August 2014 the Company and LM-VP AtriCure, LLC (Landlord), a third party unrelated to the Company, entered into a new building lease (Mason Lease) in order to re-locate its corporate headquarters and West Chester, Ohio facilities from their current location to a building to be constructed on Innovation Way in Mason, Ohio and occupied exclusively by the Company.

The term of the Mason Lease is fifteen years with three separate five-year renewal options, at the Company’s option, and begins upon substantial completion of the construction of the building (Commencement Date). The Mason Lease commenced in October 2015. The amount of initial annual base rent of $1,353 is payable monthly beginning on the Commencement Date and is subject to a 2% increase each year during the Lease’s initial term. Upon each renewal, the amount of rent payable will be agreed upon by the Company and Landlord or, if not so agreed upon, by an appraiser. The size of the building subject to the Lease is expected to be approximately 92 square feet.

Under the Mason Lease, the Company is responsible for paying real estate taxes, insurance, utilities, operating expenses and most building repairs and maintenance. The Company is also responsible for paying the first $750 of construction-related tenant improvement costs, as well as amounts in excess of the estimated total cost of construction, as defined by the Mason Lease. On the Commencement Date, the Company is required to provide a letter of credit to the Landlord in the amount of $1,250, which amount may decrease or be removed entirely based on the Company’s financial performance. A letter of credit in the amount of $1,250 was issued subsequent to September 30, 2015. The Company is deemed the owner of the project during the construction period. As a result, approximately $13,507and $3,941 of project costs incurred to date to construct the building are included in property and equipment and the financing obligation is included in other current liabilities in the Condensed Consolidated Balance Sheets as of September 30, 2015 and December 31, 2014, respectively. An increase in purchases of building under construction and proceeds from the construction financing obligation are also included in the Condensed Consolidated Statement of Cash Flows as of September 30, 2015.

Royalty Agreements

The Company has certain royalty agreements in place with terms that include payment of royalties based on product revenue from sales of specified current products. The royalty agreements have effective dates as early as 2003 and terms ranging from three years to at least twenty years. The royalties range from 0.75% to 5% of specified product sales. One of the agreements includes minimum quarterly payments of $50 through 2015 and a maximum of $2,000 in total royalties over the term of the agreement. Parties to the royalty agreements have the right at any time to terminate the agreement immediately for cause. Royalty expense of $423 and $356 was recorded as part of cost of revenue for the three months ended September 30, 2015 and 2014, respectively, and $1,321 and $925 was recorded for the nine months ended September 30, 2015 and 2014.

Purchase Agreements

The Company enters into standard purchase agreements with certain vendors in the ordinary course of business. Outstanding commitments at September 30, 2015 and 2014 were not significant.

Legal

The Company may, from time to time, become a party to legal proceedings.

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Income Tax Provision

9 Months Ended

Sep. 30, 2015

Income Tax Provision [Abstract]

Income Tax Provision

8. INCOME TAX PROVISION

The Company files federal, state, and foreign income tax returns in jurisdictions with varying statutes of limitations. Income taxes are computed using the asset and liability method in accordance with FASB ASC 740, “Income Taxes”, under which deferred income taxes are provided for the temporary differences between the financial reporting basis and the tax basis of the Company’s assets and liabilities. Deferred taxes are measured using provisions of currently enacted tax laws. A valuation allowance against deferred tax assets is recorded when it is more-likely-than-not that such assets will not be fully realized. The Company has recorded a full valuation allowance against its net deferred tax assets as it is more-likely-than-not that the benefit of the deferred tax assets will not be recognized in future periods. Tax credits are accounted for as a reduction of income taxes in the year in which the credit originates. The Company does not expect any significant unrecognized tax benefits to arise over the next twelve months.

The Company’s provision for income taxes for continuing operations in interim periods is computed by applying its estimated annual effective rate against its loss before income tax (expense) benefit for the period. In addition, non-recurring or discrete items are recorded during the period in which they occur. The effective tax rate for the three months ended September 30, 2015 and 2014 was (0.09%) and (0.87%), respectively. The effective tax rate for the nine months ended September 30, 2015 and 2014 was (0.12%) and (0.33%), respectively.

The Company has not had to accrue any interest and penalties related to unrecognized income tax benefits as a result of offsetting net operating losses. However, if the situation occurs, the Company will recognize interest and penalties within the income tax expense (benefit) line in the accompanying Condensed Consolidated Statements of Operations and Comprehensive Loss and within the related tax liability line in the Condensed Consolidated Balance Sheets.

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Segment and Geographic Information

9 Months Ended

Sep. 30, 2015

Segment and Geographic Information [Abstract]

Segment and Geographic Information

10. SEGMENT AND GEOGRAPHIC INFORMATION

The Company evaluates reporting segments in accordance with FASB ASC 280, “Segment Reporting”. The Company develops, manufactures, and sells devices designed primarily for the surgical ablation of cardiac tissue and systems designed for the exclusion of the left atrial appendage. These devices are developed and marketed to a broad base of medical centers in the United States and internationally. Management considers all such sales to be part of a single reportable segment. Revenue attributed to geographic areas is based on the location of the customers to whom products are sold.

Revenue by geographic area was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
United States	$	24,665	$	20,060	$	73,332	$	58,106
Europe		3,972		4,576		12,510		13,183
Asia		2,609		1,870		7,447		6,341
Other international		177		172		603		409
Total international		6,758		6,618		20,560		19,933
Total revenue	$	31,423	$	26,678	$	93,892	$	78,039

Domestic revenue by product type was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Open-heart ablation	$	13,041	$	11,265	$	39,043	$	32,498
Minimally invasive ablation		5,011		3,933		14,415		11,774
AtriClip		5,927		4,285		17,716		11,856
Total ablation and AtriClip		23,979		19,483		71,174		56,128
Valve tools		686		577		2,158		1,978
Total domestic	$	24,665	$	20,060	$	73,332	$	58,106

International revenue by product type was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Open-heart ablation	$	4,092	$	4,150	$	12,396	$	12,175
Minimally invasive ablation		1,945		1,804		5,771		5,773
AtriClip		598		543		2,058		1,390
Total ablation and AtriClip		6,635		6,497		20,225		19,338
Valve tools		123		121		335		595
Total international	$	6,758	$	6,618	$	20,560	$	19,933

The majority of the Company’s long-lived assets are located in the United States.

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Intangible Assets (Narative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Intangible Assets [Abstract]
Amortization of intangible assets	$ 302	$ 355	$ 908	$ 1,066

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Fair Value (Tables)

9 Months Ended

Sep. 30, 2015

Fair Value [Abstract]

Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis

In accordance with ASC 820, the following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2015:  

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	—	$	22,918	$	—	$	22,918
U.S. government agencies and securities		1,615		—		—		1,615
Corporate bonds		—		28,478		—		28,478
Total assets	$	1,615	$	51,396	$	—	$	53,011

There were no changes in the levels or methodology of measurement of financial assets and liabilities during the three or nine month periods ended September 30, 2015.

In accordance with ASC 820, the following table represents the Company’s fair value hierarchy for its financial assets and liabilities measured at fair value on a recurring basis as of December 31, 2014:  

	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Other Unobservable Inputs (Level 3)		Total
Assets:
Money market funds	$	—	$	23,692	$	—	$	23,692
Commercial paper		—		1,800		—		1,800
U.S. government agencies and securities		3,022		—		—		3,022
Corporate bonds		—		35,337		—		35,337
Total assets	$	3,022	$	60,829	$	—	$	63,851
Liabilities:
Derivative instruments	$	—	$	—	$	120	$	120
Acquisition-related contingent consideration		—		—		—		—
Total liabilities	$	—	$	—	$	120	$	120

There were no changes in the levels or methodology of measurement of financial assets and liabilities during the twelve months ended December 31, 2014.

Level 3 Fair Value Measurements Using Significant Other Unobservable Inputs for Derivative Instruments

In accordance with ASC 820, the following table represents the Company’s Level 3 fair value measurements using significant other unobservable inputs for derivative instruments as of September 30, 2015:  

Beginning Balance – January 1, 2015	$	120
Total losses included in earnings		57
Exercises		(177)
Reclassification from equity to liability when fully vested		—
Ending Balance – September 30, 2015	$	—

In accordance with ASC 820, the following table represents the Company’s Level 3 fair value measurements using significant other unobservable inputs for derivative instruments as of December 31, 2014:  

Beginning Balance – January 1, 2014	$	350
Total gains included in earnings		(183)
Exercises		(47)
Reclassification from equity to liability when fully vested		—
Ending Balance – December 31, 2014	$	120

Level 3 Fair Value Measurements Using Significant Other Unobservable Inputs for Acquisition-Related Contingent Consideration

Beginning Balance – January 1, 2014	$	8,032
Amounts acquired		—
Transfers in (out) of Level 3		—
Changes in fair value included in earnings		(8,032)
Ending Balance – December 31, 2014	$	—

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Segment and Geographic Information (Tables)

9 Months Ended

Sep. 30, 2015

Segment and Geographic Information [Abstract]

Revenue by Geographic Area

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
United States	$	24,665	$	20,060	$	73,332	$	58,106
Europe		3,972		4,576		12,510		13,183
Asia		2,609		1,870		7,447		6,341
Other international		177		172		603		409
Total international		6,758		6,618		20,560		19,933
Total revenue	$	31,423	$	26,678	$	93,892	$	78,039

Revenue by Product Type

Domestic revenue by product type was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Open-heart ablation	$	13,041	$	11,265	$	39,043	$	32,498
Minimally invasive ablation		5,011		3,933		14,415		11,774
AtriClip		5,927		4,285		17,716		11,856
Total ablation and AtriClip		23,979		19,483		71,174		56,128
Valve tools		686		577		2,158		1,978
Total domestic	$	24,665	$	20,060	$	73,332	$	58,106

International revenue by product type was as follows:

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Open-heart ablation	$	4,092	$	4,150	$	12,396	$	12,175
Minimally invasive ablation		1,945		1,804		5,771		5,773
AtriClip		598		543		2,058		1,390
Total ablation and AtriClip		6,635		6,497		20,225		19,338
Valve tools		123		121		335		595
Total international	$	6,758	$	6,618	$	20,560	$	19,933

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Income Tax Provision (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Provision [Abstract]
Effective tax rate	(0.09%)	(0.87%)	(0.12%)	(0.33%)

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net loss	$ (16,298)	$ (10,867)
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation expense	6,533	5,704
Depreciation	3,304	2,405
Amortization of intangible assets	908	1,066
Amortization of deferred financing costs	46	99
Loss on disposal of property and equipment	83	11
Realized loss from foreign exchange on intercompany transactions	333
Amortization/accretion on investments	472	322
Change in allowance for doubtful accounts	55	73
Change in value of contingent consideration		(8,032)
Other		95
Changes in operating assets and liabilities:
Accounts receivable	571	(1,785)
Inventories	(2,461)	(4,555)
Other current assets	(449)	833
Accounts payable	2,181	(539)
Accrued liabilities	557	(3,604)
Other noncurrent assets and liabilities	403	(813)
Net cash used in operating activities	(3,762)	(19,587)
Cash flows from investing activities:
Purchases of available-for-sale securities	(19,525)	(31,412)
Sales and maturities of available-for-sale securities	29,174	14,614
Purchases of property and equipment	(8,287)	(4,389)
Increases in property under build-to-suit obligation	(9,128)
Net cash used in investing activities	(7,766)	(21,187)
Cash flows from financing activities:
Proceeds from sale of stock, net of offering costs of $0 and $257, respectively		65,830
Payments on debt and capital leases	(36)	(6,362)
Increases in build-to-suit obligation	9,128
Proceeds from tax incentive loan	340
Payment of debt fees and premium on retirement of debt	(62)	(181)
Proceeds from stock option exercises	2,421	1,657
Shares repurchased for payment of taxes on stock awards	(650)	(198)
Proceeds from issuance of common stock under employee stock purchase plan	906	708
Net cash provided by financing activities	12,047	61,454
Effect of exchange rate changes on cash and cash equivalents	(189)	(46)
Net increase in cash and cash equivalents	330	20,634
Cash and cash equivalents-beginning of period	28,384	14,892
Cash and cash equivalents-end of period	28,714	35,526
Supplemental cash flow information:
Cash paid for interest	4	113
Cash paid for taxes	20	146
Non-cash investing and financing activities:
Accrued purchases of property and equipment	2,442	2,572
Assets acquired through capital lease	$ 50	$ 8

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Intangible Assets

9 Months Ended

Sep. 30, 2015

Intangible Assets [Abstract]

Intangible Assets

4. INTANGIBLE ASSETS

The following table provides a summary of the Company’s intangible assets with definite lives:

	September 30,				December 31,
	2015				2014
	Cost		Accumulated Amortization		Cost		Accumulated Amortization
Non-compete agreement	$	100	$	100	$	100	$	93
Fusion technology		9,242		1,617		9,242		924
Clamp & probe technology		829		484		829		276
Estech trade name		208		208		208		208
Total	$	10,379	$	2,409	$	10,379	$	1,501

Amortization expense related to intangible assets with definite lives was $302 and $355 for the three months ended September 30, 2015 and 2014, respectively, and $908 and $1,066 for the nine months ended September 30, 2015 and 2014, respectively.

Future amortization expense related to intangible assets with definite lives is projected as follows:

2015	$	300	October 1, 2015 through December 31, 2015
2016		1,201
2017		924
2018		924
2019		924
2020 and thereafter		3,697
Total	$	7,970

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Description of Business and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Description Of Business And Significant Accounting Policies [Line Items]
Shipping and handling revenue	$ 260	$ 236	$ 778	$ 699
Payment terms for end-users			30 days
Payment terms for distributors			60 days
Depreciation			$ 3,304	2,405
Net carrying amount of loaned equipment	27,455		27,455		$ 11,552
Grant income	0	231	35	731
(Income) expense related to remeasurement of fair value of fully vested stock options	0	158	(57)	275
Company's expense related to the medical device excise tax	164	204	$ 468	$ 434
Options, restricted stock and performance based shares excluded from calculation of net loss per share			4,243	3,782
Share-based compensation expense recognized	2,392	1,716	$ 6,533	$ 5,704
Subsidiaries [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Net foreign currency transaction (losses) gains	(48)	(51)	$ (257)	(30)
Computer and Other Office Equipment [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Estimated useful life by major asset category			3 years
Generators [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Depreciation	733	$ 593	$ 2,026	$ 1,552
Carrying Amount of Loaned Equipment [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Net carrying amount of loaned equipment	$ 5,237		$ 5,237		$ 4,141
Short-term Debt [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Maturity period of short term investment			1 year
Minimum [Member] | Generators and Other Capital Equipment, Machinery, Equipment and Vehicles [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Estimated useful life by major asset category			3 years
Minimum [Member] | Furniture and Fixtures [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Estimated useful life by major asset category			3 years
Maximum [Member] | Generators and Other Capital Equipment, Machinery, Equipment and Vehicles [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Estimated useful life by major asset category			7 years
Maximum [Member] | Furniture and Fixtures [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Estimated useful life by major asset category			7 years

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Indebtedness (Narrative) (Details) € in Thousands, $ in Thousands			9 Months Ended
	Mar. 31, 2015 USD ($)	Mar. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2014 EUR (€)
Line of Credit Facility [Line Items]
Cost of assets under lease			$ 212
Accumulated amortization on the capital leases			99
Silicon Valley Bank Agreement [Member] | Letter of Credit [Member]
Line of Credit Facility [Line Items]
Credit facility	$ 2,000	$ 1,000
Silicon Valley Bank Agreement [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility			$ 15,000
Credit facility maturity date	Apr. 30, 2018	Apr. 30, 2016	Apr. 30, 2018
Borrowings under the revolving credit facility, availability			$ 0
Borrowings under the revolving credit facility, outstanding			$ 13,292
Corporate Credit Card [Member]
Line of Credit Facility [Line Items]
Credit facility maturity date			Jun. 30, 2015
Letter of credit outstanding | €				€ 75
Computer And Office Equipment [Member]
Line of Credit Facility [Line Items]
Capital lease expiration period			Dec. 31, 2020

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Description of Business and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2015

Description of Business and Summary of Significant Accounting Policies [Abstract]

Inventories

	September 30,		December 31,
	2015		2014
Raw materials	$	5,371	$	4,429
Work in process		1,013		1,397
Finished goods		10,183		8,431
Inventories	$	16,567	$	14,257

Accumulated Other Comprehensive Income (Loss)

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2015		2014		2015		2014
Total accumulated other comprehensive (loss) income at   beginning of period	$	(543)	$	(178)	$	(348)	$	(139)
Unrealized Gains on Investments
Balance at beginning of period	$	(15)	$	(19)	$	(54)	$	(6)
Other comprehensive income (loss) before reclassifications		17		(20)		56		(33)
Amounts reclassified from accumulated other comprehensive   income to other income on the statement of operations		—		—		—		—
Balance at end of period	$	2	$	(39)	$	2	$	(39)
Foreign Currency Translation Adjustment
Balance at beginning of period	$	(528)	$	(159)	$	(294)	$	(133)
Other comprehensive income (loss) before reclassifications		67		(339)		135		(386)
Amounts reclassified from accumulated other comprehensive   income to other income on the statement of operations		(31)		(51)		(333)		(30)
Balance at end of period	$	(492)	$	(549)	$	(492)	$	(549)
Total accumulated other comprehensive loss at end of period	$	(490)	$	(588)	$	(490)	$	(588)