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Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Treasury Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings (Accumulated Deficit) [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2015 | $ 231,432 | $ 17 |  | $ 265,265 | $ (30,202) | $ (3,648)
Beginning balance, shares at Dec. 31, 2015 |  | 16,723,994 |  |  |  |
Stock-based compensation | 8,023 |  |  | 8,023 |  |
Exercise of stock options and issuance of restricted stock | 4,303 |  |  | 4,303 |  |
Exercise of stock options and issuance of restricted stock, shares |  | 279,841 |  |  |  |
Excess tax benefit of stock options exercised | 4,070 |  |  | 4,070 |  |
Employee stock purchase plan | 1,732 |  |  | 1,732 |  |
Employee stock purchase plan, shares |  | 33,357 |  |  |  |
Stock issued for acquisition | 2,922 |  |  | 2,922 |  |
Stock issued for acquisition, Shares |  | 43,953 |  |  |  |
Net income | 4,963 |  |  |  | 4,963 |
Foreign currency translation adjustments | 336 |  |  |  |  | 336
Reclassification of gain (loss) on investments into earnings | 18 |  |  |  |  | 18
Unrealized gain (loss) on investments, net of tax | (32) |  |  |  |  | (32)
Ending balance at Dec. 31, 2016 | 257,767 | $ 17 |  | 286,315 | (25,239) | (3,326)
Ending balance, shares at Dec. 31, 2016 |  | 17,081,145 |  |  |  |
Stock-based compensation | 12,728 |  |  | 12,728 |  |
Exercise of stock options and issuance of restricted stock | 1,410 |  |  | 1,410 |  |
Exercise of stock options and issuance of restricted stock, shares |  | 135,906 |  |  |  |
Cumulative-effect adjustment for previously unrecognized excess tax benefits | 16,277 |  |  |  | 16,277 |
Employee stock purchase plan | 1,933 |  |  | 1,933 |  |
Employee stock purchase plan, shares |  | 40,968 |  |  |  |
Retirement of escrow shares | (523) |  |  | (523) |  |
Retirement of escrow shares, shares |  | (8,866) |  |  |  |
Repurchases of common stock | (5,815) |  | $ (5,815) |  |  |
Repurchases of common stock, shares |  | (122,147) | 122,147 |  |  |
Net income | 351 |  |  |  | 351 |
Foreign currency translation adjustments | 3,944 |  |  |  |  | 3,944
Reclassification of gain (loss) on investments into earnings | 39 |  |  |  |  | 39
Ending balance at Dec. 31, 2017 | 288,111 | $ 17 | $ (5,815) | 301,863 | (8,611) | 657
Ending balance, shares at Dec. 31, 2017 |  | 17,127,006 | 122,147 |  |  |
Stock-based compensation | 11,270 |  |  | 11,270 |  |
Exercise of stock options and issuance of restricted stock | 14,344 | $ 1 |  | 14,343 |  |
Exercise of stock options and issuance of restricted stock, shares |  | 433,199 |  |  |  |
Employee stock purchase plan | 1,745 |  |  | 1,745 |  |
Employee stock purchase plan, shares |  | 34,798 |  |  |  |
Repurchases of common stock | (19,864) |  | $ (19,864) |  |  |
Repurchases of common stock, shares |  | (289,745) | 289,745 |  |  |
Stock issued for acquisition | 3,371 |  |  | 3,371 |  |
Stock issued for acquisition, Shares |  | 40,478 |  |  |  |
Net income | 23,872 |  |  |  | 23,872 |
Foreign currency translation adjustments | (3,999) |  |  |  |  | (3,999)
Reclassification of gain (loss) on investments into earnings | (273) |  |  |  |  | (273)
Unrealized gain (loss) on investments, net of tax | 397 |  |  |  |  | 397
Ending balance at Dec. 31, 2018 | $ 318,974 | $ 18 | $ (25,679) | $ 332,592 | $ 15,261 | $ (3,218)
Ending balance, shares at Dec. 31, 2018 |  | 17,345,736 | 411,892 |  |  |

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