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Statement of Stockholders' Equity - USD ($) $ in Thousands | Common Stock | Additional Paid-in Capital | Accumulated Other Comprehensive Loss | Accumulated Deficit | Total
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 | $ 314 | $ 302,969 |  | $ (243,993) | $ 59,290
Balance (in shares) at Dec. 31, 2014 | 31,434,272 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Sale of common stock, net of issuance cost | $ 86 | 115,118 |  |  | 115,204
Sale of common stock, net of issuance cost (in shares) | 8,625,000 |  |  |  |
Issuance of common stock upon exercise and vesting of stock awards | $ 4 | 550 |  |  | 554
Issuance of common stock upon exercise and vesting of stock awards (in shares) | 379,268 |  |  |  |
Issuance of common stock under the Employee Stock Purchase Plan | $ 1 | 622 |  |  | 623
Issuance of common stock under the Employee Stock Purchase Plan (in shares) | 112,499 |  |  |  |
Comprehensive income (loss) |  |  | $ (516) | (17,592) | (18,108)
Stock-based compensation expense |  | 4,869 |  |  | 4,869
Balance at Dec. 31, 2015 | $ 405 | 424,128 | (516) | (261,585) | 162,432
Balance (in shares) at Dec. 31, 2015 | 40,551,039 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Sale of common stock, net of issuance cost | $ 53 | 119,216 |  |  | 119,269
Sale of common stock, net of issuance cost (in shares) | 5,272,750 |  |  |  |
Issuance of common stock upon exercise and vesting of stock awards | $ 7 | 1,153 |  |  | 1,160
Issuance of common stock upon exercise and vesting of stock awards (in shares) | 699,066 |  |  |  |
Issuance of common stock under the Employee Stock Purchase Plan | $ 1 | 544 |  |  | 545
Issuance of common stock under the Employee Stock Purchase Plan (in shares) | 45,123 |  |  |  |
Comprehensive income (loss) |  |  | (925) | 23,625 | 22,700
Stock-based compensation expense |  | 7,848 |  |  | 7,848
Balance (Scenario, Previously Reported) at Dec. 31, 2016 | $ 466 | 552,889 | (1,441) | (237,960) | 313,954
Balance at Dec. 31, 2016 | $ 466 | 553,290 | (1,441) | (238,361) | 313,954
Balance (in shares) (Scenario, Previously Reported) at Dec. 31, 2016 | 46,567,978 |  |  |  |
Balance (in shares) at Dec. 31, 2016 | 46,567,978 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Issuance of common stock upon exercise and vesting of stock awards | $ 4 | 2,793 |  |  | 2,797
Issuance of common stock upon exercise and vesting of stock awards (in shares) | 363,603 |  |  |  |
Issuance of common stock under the Employee Stock Purchase Plan |  | 936 |  |  | 936
Issuance of common stock under the Employee Stock Purchase Plan (in shares) | 70,907 |  |  |  |
Comprehensive income (loss) |  |  | (367) | (48,925) | (49,292)
Stock-based compensation expense |  | 13,651 |  |  | 13,651
Balance at Dec. 31, 2017 | $ 470 | 570,670 | $ (1,808) | (287,286) | $ 282,046
Balance (in shares) at Dec. 31, 2017 | 47,002,488 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Adoption of ASU 2016-09 | ASU 2016-09 |  | $ 401 |  | $ (401) |

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