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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock IPO | Common Stock Private Placement | Common Stock | Preferred Stock | Treasury Stock | Additional Paid-in Capital IPO | Additional Paid-in Capital Private Placement | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) Income Net of Income Taxes | IPO | Private Placement | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2018 |  |  | $ 140 |  |  |  |  | $ 281,600 | $ 11,181 | $ 3 |  |  | $ 292,924
Balance (in shares) at Dec. 31, 2018 |  |  | 139,618 |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  | (67)
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (70) |  |  | (70)
Stock-based compensation |  |  |  |  |  |  |  | 1,680 |  |  |  |  | 1,680
Common stock issued upon exercise of stock options |  |  |  |  |  |  |  | 177 |  |  |  |  | 177
Common stock issued upon exercise of stock options (in shares) |  |  | 65 |  |  |  |  |  |  |  |  |  |
Common stock issued upon vesting of restricted stock units (in shares) |  |  | 38 |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 23,307 |  |  |  | 23,307
Balance at Dec. 31, 2019 |  |  | $ 140 |  |  |  |  | 283,457 | 34,488 | (67) |  |  | 318,018
Balance (in shares) at Dec. 31, 2019 |  |  | 139,721 |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 1,078 |  |  | 1,078
Stock-based compensation |  |  |  |  |  |  |  | 5,984 |  |  |  |  | 5,984
Exchange of common stock for Series A preferred stock |  |  |  | $ 454 | $ (260,686) |  |  | 260,232 |  |  |  |  |
Exchange of common stock for Series A preferred stock (in shares) |  |  |  | 45,438 | 15,146 |  |  |  |  |  |  |  |
Issuance of stock |  |  |  | $ 156 |  |  |  | 85,308 |  |  |  |  | 85,464
Issuance of stock (in shares) |  |  |  | 15,568 |  |  |  |  |  |  |  |  |
Repurchase of vested options |  |  |  |  |  |  |  | (15,506) |  |  |  |  | (15,506)
Common stock issued under employee purchase plan |  |  |  |  |  |  |  | 424 |  |  |  |  | 424
Common stock issued under employee purchase plan (in shares) |  |  | 61 |  |  |  |  |  |  |  |  |  |
Common stock issued upon exercise of stock options |  |  |  |  |  |  |  | 780 |  |  |  |  | 780
Common stock issued upon exercise of stock options (in shares) |  |  | 255 |  |  |  |  |  |  |  |  |  |
Common stock issued upon vesting of restricted stock units (in shares) |  |  | 185 |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 20,453 |  |  |  | 20,453
Balance at Dec. 31, 2020 |  |  | $ 140 | $ 610 | $ (260,686) |  |  | 620,679 | 54,941 | 1,011 |  |  | 416,695
Balance (in shares) at Dec. 31, 2020 |  |  | 140,222 | 61,006 | 15,146 |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | (1,782) |  |  | (1,782)
Shares repurchased for settlement of employee tax withholdings |  |  |  |  | $ (1,802) |  |  |  |  |  |  |  | (1,802)
Shares repurchased for settlement of employee tax withholdings (in shares) |  |  |  |  | 50 |  |  |  |  |  |  |  |
Issuance of common stock as consideration for acquisition |  |  | $ 1 |  |  |  |  | 22,525 |  |  |  |  | 22,526
Issuance of common stock as consideration for acquisition (in shares) |  |  | 684 |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  | 21,887 |  |  |  |  | 21,887
Exchange of common stock for Series A preferred stock |  |  | $ 5 | $ (610) | $ 260,686 |  |  | (260,081) |  |  |  |  |
Exchange of common stock for Series A preferred stock (in shares) |  |  | 5,190 | (61,006) | (15,146) |  |  |  |  |  |  |  |
Issuance of stock | $ 10 | $ 1 |  |  |  | $ 269,380 | $ 29,999 |  |  |  | $ 269,390 | $ 30,000 |
Issuance of stock (in shares) | 9,977 | 1,111 |  |  |  |  |  |  |  |  |  |  |
Common stock issued under employee purchase plan |  |  |  |  |  |  |  | 404 |  |  |  |  | 404
Common stock issued under employee purchase plan (in shares) |  |  | 15 |  |  |  |  |  |  |  |  |  |
Common stock issued upon exercise of stock options |  |  | $ 5 |  |  |  |  | 12,435 |  |  |  |  | $ 12,440
Common stock issued upon exercise of stock options (in shares) |  |  | 4,782 |  |  |  |  |  |  |  |  |  | 4,788
Common stock issued upon vesting of restricted stock units (in shares) |  |  | 366 |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 29,308 |  |  |  | $ 29,308
Balance at Dec. 31, 2021 |  |  | $ 162 |  | $ (1,802) |  |  | $ 717,228 | $ 84,249 | $ (771) |  |  | $ 799,066
Balance (in shares) at Dec. 31, 2021 |  |  | 162,347 |  | 50 |  |  |  |  |  |  |  |

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