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Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common stock | Additional paid-in capital | Retained earnings | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 310,424 | $ 22 | $ 249,194 | $ 60,484 | $ 724
Beginning Balance, shares at Dec. 31, 2018 |  | 21,778,632 |  |  |
Stock-based compensation | 6,930 |  | 6,930 |  |
Employee stock purchases | 2,748 |  | 2,748 |  |
Employee stock purchases, shares |  | 47,816 |  |  |
Restricted stock awards issued, net of forfeitures, shares |  | 79,058 |  |  |
Vesting of restricted stock units | (73) |  | (73) |  |
Vesting of restricted stock units, shares |  | 24,817 |  |  |
Shares withheld related to net restricted stock settlement | (764) |  | (764) |  |
Shares withheld related to net restricted stock settlement, shares |  | (14,002) |  |  |
Stock options exercised | 2,036 |  | 2,036 |  |
Stock options exercised, shares |  | 82,053 |  |  |
Net income (loss) | 22,325 |  |  | 22,325 |
Other comprehensive income (loss) | (480) |  |  |  | (480)
Ending Balance at Sep. 30, 2019 | 343,146 | $ 22 | 260,071 | 82,809 | 244
Ending Balance, shares at Sep. 30, 2019 |  | 21,998,374 |  |  |
Beginning Balance at Jun. 30, 2019 | 333,798 | $ 22 | 257,177 | 75,946 | 653
Beginning Balance, shares at Jun. 30, 2019 |  | 21,933,669 |  |  |
Stock-based compensation | 1,565 |  | 1,565 |  |
Employee stock purchases | 1,223 |  | 1,223 |  |
Employee stock purchases, shares |  | 31,049 |  |  |
Restricted stock awards issued, net of forfeitures, shares |  | 24,456 |  |  |
Vesting of restricted stock units | (6) |  | (6) |  |
Vesting of restricted stock units, shares |  | 3,441 |  |  |
Shares withheld related to net restricted stock settlement | (46) |  | (46) |  |
Shares withheld related to net restricted stock settlement, shares |  | (979) |  |  |
Stock options exercised | 158 |  | 158 |  |
Stock options exercised, shares |  | 6,738 |  |  |
Net income (loss) | 6,863 |  |  | 6,863 |
Other comprehensive income (loss) | (409) |  |  |  | (409)
Ending Balance at Sep. 30, 2019 | 343,146 | $ 22 | 260,071 | 82,809 | 244
Ending Balance, shares at Sep. 30, 2019 |  | 21,998,374 |  |  |
Beginning Balance at Dec. 31, 2019 | 344,621 | $ 22 | 263,252 | 81,434 | (87)
Beginning Balance, shares at Dec. 31, 2019 |  | 22,031,410 |  |  |
Stock-based compensation | 6,111 |  | 6,111 |  |
Employee stock purchases | 2,084 |  | 2,084 |  |
Employee stock purchases, shares |  | 68,467 |  |  |
Restricted stock awards issued, net of forfeitures, shares |  | (27,729) |  |  |
Vesting of restricted stock units | (14) |  | (14) |  |
Vesting of restricted stock units, shares |  | 41,647 |  |  |
Shares withheld related to net restricted stock settlement | (274) |  | (274) |  |
Shares withheld related to net restricted stock settlement, shares |  | (6,828) |  |  |
Stock options exercised | $ 186 |  | 186 |  |
Stock options exercised, shares | 9,324 | 9,324 |  |  |
Net income (loss) | $ (708) |  |  | (708) |
Other comprehensive income (loss) | 494 |  |  |  | 494
Ending Balance at Sep. 30, 2020 | 352,500 | $ 22 | 271,345 | 80,726 | 407
Ending Balance, shares at Sep. 30, 2020 |  | 22,116,291 |  |  |
Beginning Balance at Jun. 30, 2020 | 351,114 | $ 22 | 268,349 | 82,425 | 318
Beginning Balance, shares at Jun. 30, 2020 |  | 22,065,961 |  |  |
Stock-based compensation | 2,050 |  | 2,050 |  |
Employee stock purchases | 996 |  | 996 |  |
Employee stock purchases, shares |  | 40,513 |  |  |
Vesting of restricted stock units | (3) |  | (3) |  |
Vesting of restricted stock units, shares |  | 11,431 |  |  |
Shares withheld related to net restricted stock settlement | (47) |  | (47) |  |
Shares withheld related to net restricted stock settlement, shares |  | (1,614) |  |  |
Net income (loss) | (1,699) |  |  | (1,699) |
Other comprehensive income (loss) | 89 |  |  |  | 89
Ending Balance at Sep. 30, 2020 | $ 352,500 | $ 22 | $ 271,345 | $ 80,726 | $ 407
Ending Balance, shares at Sep. 30, 2020 |  | 22,116,291 |  |  |

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