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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit
--- | --- | --- | --- | ---
Beginning balance, shares at Dec. 31, 2014 |  |  | 49,322 |  |
Beginning balance at Dec. 31, 2014 |  | $ 41,753 | $ 49 | $ 170,286 | $ (128,582)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon exercise of stock options and warrants, shares |  |  | 992 |  |
Issuance of common stock upon exercise of stock options and warrants |  | 1,266 | $ 1 | 1,265 |
Issuance of common stock upon vesting of restricted stock units, shares |  |  | 566 |  |
Issuance of common stock upon vesting of restricted stock units |  | 0 | $ 1 | (1) |
Issuance of common stock under ESPP, shares |  |  | 306 |  |
Issuance of common stock under ESPP |  | 1,369 |  | 1,369 |
Stock-based compensation |  | 7,730 |  | 7,730 |
Forfeiture of unvested restricted common stock, shares |  |  | (21) |  |
Forfeiture of unvested restricted common stock |  | 0 |  | 0 |
Net loss |  | (25,838) |  |  | (25,838)
Ending balance at Dec. 31, 2015 |  | 26,280 | $ 51 | 180,649 | (154,420)
Ending balance, shares at Dec. 31, 2015 |  |  | 51,165 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon exercise of stock options and warrants, shares |  |  | 982 |  |
Issuance of common stock upon exercise of stock options and warrants |  | 4,286 | $ 1 | 4,285 |
Issuance of common stock upon vesting of restricted stock units, shares |  |  | 896 |  |
Issuance of common stock upon vesting of restricted stock units |  | 0 | $ 1 | (1) |
Issuance of common stock under ESPP, shares |  |  | 320 |  |
Issuance of common stock under ESPP |  | 1,979 |  | 1,979 |
Stock-based compensation |  | 9,643 |  | 9,643 |
Net loss |  | (11,860) |  |  | (11,860)
Ending balance at Dec. 31, 2016 |  | 30,328 | $ 53 | 196,555 | (166,280)
Ending balance, shares at Dec. 31, 2016 |  |  | 53,363 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Issuance of common stock upon exercise of stock options and warrants, shares |  |  | 2,033 |  |
Issuance of common stock upon exercise of stock options and warrants |  | 6,035 | $ 2 | 6,033 |
Issuance of common stock upon vesting of restricted stock units, shares |  |  | 971 |  |
Issuance of common stock upon vesting of restricted stock units |  | 0 | $ 1 | (1) |
Issuance of common stock under ESPP, shares |  |  | 265 |  |
Issuance of common stock under ESPP |  | 4,101 | $ 1 | 4,100 |
Stock-based compensation |  | 15,343 |  | 15,343 |
Other | [1] | 0 |  | 172 | (172)
Net loss |  | (8,969) |  |  | (8,969)
Ending balance at Dec. 31, 2017 |  | $ 46,838 | $ 57 | $ 222,202 | $ (175,421)
Ending balance, shares at Dec. 31, 2017 |  |  | 56,632 |  |
[1] | Effective January 2017, the Company adopted Accounting Standards Update (“ASU”) 2016-09 - Improvements to Employee Share-Based Payment Accounting. Accordingly, the Company accounted for forfeitures as they occurred rather than by estimating expected forfeitures. This amount represents the net effect of this change. See Note 1 for more information.

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