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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Additional Paid-in-Capital | Accumulated Other Comprehensive Income | Accumulated Deficit | Treasury Stock | Total
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 32 | $ 291,853 | $ 51 | $ (196,613) | $ (132) | $ 95,191
Balance (in shares) at Dec. 31, 2015 | 32,209 |  |  |  | (28) |
Stockholders' Deficit |  |  |  |  |  |
Common stock issued under stock plans | $ 2 | 8,064 |  |  |  | 8,066
Common stock issued under stock plans (in shares) | 1,756 |  |  |  |  |
Exercise of common stock warrant |  | 112 |  |  |  | 112
Exercise of common stock warrant (in shares) | 6 |  |  |  |  |
Stock-based compensation |  | 8,786 |  |  |  | 8,786
Other comprehensive income |  |  | 597 |  |  | 597
Net loss |  |  |  | 4,522 |  | 4,522
Balance at Dec. 31, 2016 | $ 34 | 308,815 | 648 | (192,091) | $ (132) | 117,274
Balance (in shares) at Dec. 31, 2016 | 33,971 |  |  |  | (28) |
Stockholders' Deficit |  |  |  |  |  |
Common stock issued under stock plans | $ 1 | 4,666 |  |  |  | 4,667
Common stock issued under stock plans (in shares) | 676 |  |  |  |  |
Stock-based compensation |  | 17,592 |  |  |  | 17,592
Other comprehensive income |  |  | (1,239) |  |  | (1,239)
Net loss |  |  |  | (92) |  | (92)
Balance at Dec. 31, 2017 | $ 35 | 331,073 | (591) | (192,183) | $ (132) | $ 138,202
Balance (in shares) at Dec. 31, 2017 | 34,647 |  |  |  | (28) | 34,619
Stockholders' Deficit |  |  |  |  |  |
Common stock issued under stock plans | $ 1 | 21,575 |  |  |  | $ 21,576
Common stock issued under stock plans (in shares) | 1,488 |  |  |  |  |
Stock-based compensation |  | 25,704 |  |  |  | 25,704
Other comprehensive income |  |  | 1,329 |  |  | 1,329
Net loss |  |  |  | (12,951) |  | (12,951)
Balance at Dec. 31, 2018 | $ 36 | $ 378,352 | $ 738 | $ (205,134) | $ (132) | $ 173,860
Balance (in shares) at Dec. 31, 2018 | 36,135 |  |  |  | (28) | 36,107

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