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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Common Stock Nonemployee | Common Stock Employee | Common Stock | Additional Paid-in Capital [Member] Nonemployee | Additional Paid-in Capital [Member] Employee | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Stock [Member] | Nonemployee | Employee | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Stockholders’ equity at the beginning of period at Dec. 31, 2012 |  |  | $ 4 |  |  | $ 171,488 | $ 61,947 |  |  |  |  | $ 233,439
Balance as of at Dec. 31, 2012 |  |  | 38,681,660 |  |  |  |  |  |  |  |  |
Changes in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  | 11,862 |  |  |  |  | $ 11,862
Accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |
Reduction of excess tax benefit of share-based awards |  |  |  |  |  | (647) |  |  |  |  |  | $ (647)
Exercise of stock options |  |  |  |  |  | 55 |  |  |  |  |  | 55
Exercise of stock options, shares |  |  | 4,200 |  |  |  |  |  |  |  |  |
Issuance of common stock in connection with the release of vested restricted stock units, net of common stock withheld to settle equity awards |  |  |  |  | $ (199) |  |  |  |  |  | $ (199) |
Issuance of common stock in connection with the release of vested restricted stock units, net of common stock withheld to settle equity awards, shares | 66,057 | 14,023 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 946 | 6,089 |  |  |  |  | $ 946 | 6,089 |
Stockholders’ equity at the end of period at Dec. 31, 2013 |  |  | $ 4 |  |  | 177,732 | 73,809 |  |  |  |  | 251,545
Balance as of at Dec. 31, 2013 |  |  | 38,765,940 |  |  |  |  |  |  |  |  |
Changes in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  | (10,699) |  |  |  |  | (10,699)
Accumulated other comprehensive loss |  |  |  |  |  |  |  | $ (1,654) |  |  |  | (1,654)
Reduction of excess tax benefit of share-based awards |  |  |  |  |  | (1,109) |  |  |  |  |  | (1,109)
Common stock issued through initial public offering |  |  |  |  |  | 38,018 |  |  |  |  |  | 38,018
Common stock issued through initial public offering (in Shares) |  |  | 5,840,000 |  |  |  |  |  |  |  |  |
Cost related to public offering |  |  |  |  |  | (3,358) |  |  |  |  |  | (3,358)
Treasury stock acquired |  |  |  |  |  |  |  |  | $ (345) |  |  | (345)
Treasury stock acquired (in Shares) |  |  |  |  |  |  |  |  | (29,400) |  |  |
Exercise of stock options |  |  |  |  |  | 571 |  |  |  |  |  | $ 571
Exercise of stock options, shares |  |  | 30,000 |  |  |  |  |  |  |  |  | 65,000
Issuance of common stock in connection with the release of vested restricted stock units, net of common stock withheld to settle equity awards |  |  |  |  | (389) |  |  |  |  |  | (389) |
Issuance of common stock in connection with the release of vested restricted stock units, net of common stock withheld to settle equity awards, shares | 25,921 | 14,306 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | 946 | 8,334 |  |  |  |  | 946 | 8,334 |
Stockholders’ equity at the end of period at Dec. 31, 2014 |  |  | $ 4 |  |  | 220,745 | 63,110 | (1,654) | $ (345) |  |  | $ 281,860
Balance as of at Dec. 31, 2014 |  |  | 44,676,167 |  |  |  |  |  | (29,400) |  |  | 44,646,767
Changes in Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  | (2,787) |  |  |  |  | $ (2,787)
Accumulated other comprehensive loss |  |  |  |  |  |  |  | (821) |  |  |  | (821)
Reduction of excess tax benefit of share-based awards |  |  |  |  |  | 107 |  |  |  |  |  | 107
Treasury stock acquired |  |  |  |  |  |  |  |  | $ (9,865) |  |  | (9,865)
Treasury stock acquired (in Shares) |  |  |  |  |  |  |  |  | (735,679) |  |  |
Issuance of common stock from treasury |  |  |  |  |  | (38) |  |  | $ 38 |  |  |
Issuance of common stock from treasury, shares |  |  |  |  |  |  |  |  | 3,364 |  |  |
Exercise of stock options |  |  | $ 1 |  |  | 13,501 |  |  |  |  |  | $ 13,502
Exercise of stock options, shares |  |  | 1,067,466 |  |  |  |  |  |  |  |  | 1,262,663
Issuance of common stock in connection with the release of vested restricted stock units, net of common stock withheld to settle equity awards |  |  |  |  | (621) |  |  |  |  |  | (621) |
Issuance of common stock in connection with the release of vested restricted stock units, net of common stock withheld to settle equity awards, shares | 676 | 91,517 |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  | $ 1,131 | 11,684 |  |  |  |  | $ 1,131 | 11,684 |
Issuance of common stock to employees under ESPP |  |  |  |  | $ 1,320 |  |  |  |  |  | $ 1,320 |
Issuance of common stock to employees under ESPP, Shares |  | 124,380 |  |  |  |  |  |  |  |  |  |
Stockholders’ equity at the end of period at Dec. 31, 2015 |  |  | $ 5 |  |  | $ 247,829 | $ 60,323 | $ (2,475) | $ (10,172) |  |  | $ 295,510
Balance as of at Dec. 31, 2015 |  |  | 45,960,206 |  |  |  |  |  | (761,715) |  |  | 45,198,491

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