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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common stock | Additional paid-in capital | Retained earnings (accumulated deficit) | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2016 | $ 182,088 | $ 20 | $ 194,466 | $ (12,363) | $ (35)
Beginning Balance, shares at Dec. 31, 2016 |  | 20,389,860 |  |  |
Stock-based compensation | 4,107 |  | 4,107 |  |
Employee stock purchases | 581 |  | 581 |  |
Employee stock purchases, shares |  | 11,805 |  |  |
Stock options exercised | 6,730 | $ 1 | 6,729 |  |
Stock options exercised, shares |  | 308,132 |  |  |
Net income | 14,270 |  |  | 14,270 |
Other comprehensive income | 1 |  |  |  | 1
Ending Balance at Jun. 30, 2017 | 207,777 | $ 21 | 205,883 | 1,907 | (34)
Ending Balance, shares at Jun. 30, 2017 |  | 20,709,797 |  |  |
Beginning Balance at Dec. 31, 2017 | 227,041 | $ 21 | 218,109 | 8,639 | 272
Beginning Balance, shares at Dec. 31, 2017 |  | 20,976,350 |  |  |
Stock-based compensation | 6,567 |  | 6,567 |  |
Employee stock purchases | 988 |  | 988 |  |
Employee stock purchases, shares |  | 12,013 |  |  |
Restricted stock awards issued, shares |  | 53,052 |  |  |
Vesting of restricted stock units, shares |  | 6,665 |  |  |
Shares withheld related to net restricted stock settlement | (302) |  | (302) |  |
Shares withheld related to net restricted stock settlement, shares |  | (2,553) |  |  |
Stock options exercised | $ 6,517 |  | 6,517 |  |
Stock options exercised, shares | 276,016 | 276,016 |  |  |
Net income | $ 25,368 |  |  | 25,368 |
Other comprehensive income | 727 |  |  |  | 727
Ending Balance at Jun. 30, 2018 | $ 266,906 | $ 21 | $ 231,879 | $ 34,007 | $ 999
Ending Balance, shares at Jun. 30, 2018 |  | 21,321,543 |  |  |

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