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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | [1] | Common Stock | Additional Paid-in Capital | Treasury Stock | Retained Earnings | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2014 |  |  | 28,776 |  | (10,946) |  |
Beginning Balance at Dec. 31, 2014 | $ 224,504 |  | $ 29 | $ 259,007 | $ (199,998) | $ 165,288 | $ 178
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards, shares |  |  | 395 |  | (80) |  |
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards | 662 |  | $ 0 | 662 |  |  |
Stock-based compensation expense | 7,030 |  |  | 7,030 |  |  |
Foreign currency translation adjustment, net of taxes | 18 | [2] |  |  |  |  | 18
Net income | 3,964 | [2],[3] |  |  |  | 3,964 |
Balance, shares at Dec. 31, 2015 |  |  | 29,171 |  | (11,026) |  |
Ending Balance at Dec. 31, 2015 | 236,178 |  | $ 29 | 266,699 | $ (199,998) | 169,252 | 196
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards, shares |  |  | 321 |  | (110) |  |
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards | (1,187) |  | $ 0 | (1,187) |  |  |
Stock-based compensation expense | 7,266 |  |  | 7,266 |  |  |
Foreign currency translation adjustment, net of taxes | (23) | [2] |  |  |  |  | (23)
Net income | 304 | [2],[3] |  |  |  | 304 |
Balance, shares at Dec. 31, 2016 |  |  | 29,492 |  | (11,136) |  |
Ending Balance at Dec. 31, 2016 | 252,280 | [4] | $ 29 | 272,778 | $ (199,998) | 179,298 | 173
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Cumulative effect of adoption of ASU 2016-09 | Accounting Standards Update 2016-09 [Member] | 9,742 |  |  |  |  | 9,742 |
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards, shares |  |  | 388 |  | (102) |  |
Issuance of common stock in connection with exercise of common stock options and release of vested restricted stock units, net of cash used to net settle equity awards | (765) |  | $ 1 | (766) |  |  |
Stock-based compensation expense | 9,694 |  |  | 9,694 |  |  |
Foreign currency translation adjustment, net of taxes | 29 | [2] |  |  |  |  | 29
Net income | 25,426 | [2],[3] |  |  |  | 25,426 |
Balance, shares at Dec. 31, 2017 |  |  | 29,880 |  | (11,238) |  |
Ending Balance at Dec. 31, 2017 | $ 286,664 | [4] | $ 30 | $ 281,706 | $ (199,998) | $ 204,724 | $ 202
[1] | As adjusted for the adoption of ASC 606 using the full retrospective method
[2] | As adjusted for the adoption of ASC 606 using the full retrospective method
[3] | As adjusted for the adoption of ASC 606 using the full retrospective method
[4] | As adjusted for the adoption of ASC 606 using the full retrospective method

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