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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Cumulative Effect, Period of Adoption, Adjustment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Preferred Stock [Member] | Preferred Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Preferred Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Common Stock [Member] | Common Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Additional Paid-In Capital [Member] | Additional Paid-In Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Additional Paid-In Capital [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Stock Notes Receivable From Employees [Member] | Stock Notes Receivable From Employees [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Stock Notes Receivable From Employees [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Retained Earnings [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2019 | $ 494,907 | $ (33) | $ 494,874 | $ 0 | $ 0 | $ 0 | $ 4 | $ 0 | $ 4 | $ 104,658 | $ 0 | $ 104,658 | $ (4) | $ 0 | $ (4) | $ 388,271 | $ (33) | $ 388,238 | $ 1,978 | $ 0 | $ 1,978
Beginning Balance, Shares at Dec. 31, 2019 |  |  |  | 0 | 0 | 0 | 39,153,195 | 0 | 39,153,195 |  |  |  |  |  |  |  |  |  |  |  |
Net and comprehensive income (loss) | 14,385 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 13,176 |  |  | 1,209 |  |
Stock-based compensation | 5,168 |  |  | $ 0 |  |  | $ 0 |  |  | 5,168 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Stock-based compensation, Shares |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to employee stock purchase plan | 371 |  |  | $ 0 |  |  | $ 0 |  |  | 371 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Shares issued pursuant to employee stock purchase plan, Shares |  |  |  | 0 |  |  | 15,923 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for vesting of restricted stock units | 0 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for vesting of restricted stock units, Shares |  |  |  | 0 |  |  | 197,479 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for unvested restricted stock awards | 0 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for unvested restricted stock awards, Shares |  |  |  | 0 |  |  | 19,516 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (1,889) |  |  | $ 0 |  |  | $ 0 |  |  | (1,889) |  |  | 0 |  |  | 0 |  |  | 0 |  |
Shares withheld related to net share settlement of stock-based awards, shares |  |  |  | 0 |  |  | (58,096) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of stock notes receivable from employees | 4 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 4 |  |  | 0 |  |  | 0 |  |
Ending Balance at Jun. 30, 2020 | 512,913 |  |  | $ 0 |  |  | $ 4 |  |  | 108,308 |  |  | 0 |  |  | 401,414 |  |  | 3,187 |  |
Ending Balance, Shares at Jun. 30, 2020 |  |  |  | 0 |  |  | 39,328,017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2020 | 509,292 |  |  | $ 0 |  |  | $ 4 |  |  | 105,601 |  |  | (4) |  |  | 401,308 |  |  | 2,383 |  |
Beginning Balance, Shares at Mar. 31, 2020 |  |  |  | 0 |  |  | 39,272,429 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net and comprehensive income (loss) | 910 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 106 |  |  | 804 |  |
Stock-based compensation | 2,536 |  |  | $ 0 |  |  | $ 0 |  |  | 2,536 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Stock-based compensation, Shares |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to employee stock purchase plan | 371 |  |  | $ 0 |  |  | $ 0 |  |  | 371 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Shares issued pursuant to employee stock purchase plan, Shares |  |  |  | 0 |  |  | 15,923 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for vesting of restricted stock units | 0 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for vesting of restricted stock units, Shares |  |  |  | 0 |  |  | 27,373 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for unvested restricted stock awards | 0 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for unvested restricted stock awards, Shares |  |  |  | 0 |  |  | 19,516 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (200) |  |  | $ 0 |  |  | $ 0 |  |  | (200) |  |  | 0 |  |  | 0 |  |  | 0 |  |
Shares withheld related to net share settlement of stock-based awards, shares |  |  |  | 0 |  |  | (7,224) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of stock notes receivable from employees |  |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  |  |  |  | 0 |  |  | 0 |  |
Ending Balance at Jun. 30, 2020 | 512,913 |  |  | $ 0 |  |  | $ 4 |  |  | 108,308 |  |  | 0 |  |  | 401,414 |  |  | 3,187 |  |
Ending Balance, Shares at Jun. 30, 2020 |  |  |  | 0 |  |  | 39,328,017 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2020 | 546,836 |  |  | $ 0 |  |  | $ 4 |  |  | 113,182 |  |  | 0 |  |  | 431,076 |  |  | 2,574 |  |
Beginning Balance, Shares at Dec. 31, 2020 |  |  |  | 0 |  |  | 39,401,976 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net and comprehensive income (loss) | 45,742 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 46,544 |  |  | (802) |  |
Stock-based compensation | 4,950 |  |  | $ 0 |  |  | $ 0 |  |  | 4,950 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Stock-based compensation, Shares |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to employee stock purchase plan | 369 |  |  | $ 0 |  |  | $ 0 |  |  | 369 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Shares issued pursuant to employee stock purchase plan, Shares |  |  |  | 0 |  |  | 11,635 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for vesting of restricted stock units | 0 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for vesting of restricted stock units, Shares |  |  |  | 0 |  |  | 183,315 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for unvested restricted stock awards | 0 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for unvested restricted stock awards, Shares |  |  |  | 0 |  |  | 12,492 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for stock settled deferred consideration | 1,000 |  |  | $ 0 |  |  | $ 0 |  |  | 1,000 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for stock settled deferred consideration, Shares |  |  |  | 0 |  |  | 27,481 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (2,044) |  |  | $ 0 |  |  | $ 0 |  |  | (2,044) |  |  | 0 |  |  | 0 |  |  | 0 |  |
Shares withheld related to net share settlement of stock-based awards, shares |  |  |  | 0 |  |  | (58,539) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2021 | 596,853 |  |  | $ 0 |  |  | $ 4 |  |  | 117,457 |  |  | 0 |  |  | 477,620 |  |  | 1,772 |  |
Ending Balance, Shares at Jun. 30, 2021 |  |  |  | 0 |  |  | 39,578,360 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Mar. 31, 2021 | 561,669 |  |  | $ 0 |  |  | $ 4 |  |  | 113,737 |  |  | 0 |  |  | 446,088 |  |  | 1,840 |  |
Beginning Balance, Shares at Mar. 31, 2021 |  |  |  | 0 |  |  | 39,500,966 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net and comprehensive income (loss) | 31,464 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 31,532 |  |  | (68) |  |
Stock-based compensation | 2,662 |  |  | $ 0 |  |  | $ 0 |  |  | 2,662 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Stock-based compensation, Shares |  |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued pursuant to employee stock purchase plan | 369 |  |  | $ 0 |  |  | $ 0 |  |  | 369 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Shares issued pursuant to employee stock purchase plan, Shares |  |  |  | 0 |  |  | 11,635 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for vesting of restricted stock units | 0 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for vesting of restricted stock units, Shares |  |  |  | 0 |  |  | 34,198 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for unvested restricted stock awards | 0 |  |  | $ 0 |  |  | $ 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |
Issuance of common stock for unvested restricted stock awards, Shares |  |  |  | 0 |  |  | 12,492 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for stock settled deferred consideration | 1,000 |  |  |  |  |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock for stock settled deferred consideration, Shares |  |  |  | 0 |  |  | 27,481 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (311) |  |  | $ 0 |  |  | $ 0 |  |  | (311) |  |  | 0 |  |  | 0 |  |  | 0 |  |
Shares withheld related to net share settlement of stock-based awards, shares |  |  |  | 0 |  |  | (8,412) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Jun. 30, 2021 | $ 596,853 |  |  | $ 0 |  |  | $ 4 |  |  | $ 117,457 |  |  | $ 0 |  |  | $ 477,620 |  |  | $ 1,772 |  |
Ending Balance, Shares at Jun. 30, 2021 |  |  |  | 0 |  |  | 39,578,360 |  |  |  |  |  |  |  |  |  |  |  |  |  |

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