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STOCK BASED COMPENSATION - Narrative (Details) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Feb. 29, 2020 | Jan. 31, 2019 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock-based compensation |  |  |  |  |  |
Weighted-average grant date fair value per share of grants (in dollars per share) |  |  |  | $ 0 | $ 12.60 | $ 12.78
Shares of common stock authorized for issuance (in shares) |  |  |  | 1,932,173 |  |
Proceeds from issuances of common stock from employee stock purchase plans |  |  |  | $ 337,000 | $ 755,000 | $ 758,000
Total intrinsic value of stock options exercised |  |  |  | 3,943,000 | 6,456,000 | 7,516,000
Stock-based compensation expense |  |  |  | $ 22,874,000 | $ 24,255,000 | 21,910,000
Performance share units |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |  |
Performance period |  | 3 years |  | 3 years | 3 years |
Cumulative performance period | 2 years | 3 years |  | 3 years | 3 years |
Unrecognized compensation cost related to outstanding options |  |  |  | $ 4,242,000 |  |
Period over which unrecognized compensation cost is expected to be recognized as expense |  |  |  | 1 year 7 months 6 days |  |
Total expense |  |  |  | $ 0 | $ 289,000 | 950,000
Share Based Compensation Arrangement By Share Based Payment Award Average Stock Price Period |  | 30 days |  | 30 days | 30 days |
Share Based Compensation Arrangement By Share Based Payment Award Period Of Cumulative Revenue Goals | 3 years |  | 3 years |  |  |
Stock-based compensation expense | $ 906,000 |  |  | $ 5,398,000 | $ 4,817,000 | $ 3,551,000
Performance share units | Minimum |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 0.00% | 0.00% | 0.00% | 0.00% |
Performance share units | Maximum |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 200.00% | 200.00% |  |  |
Restricted stock units |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Weighted-average grant date fair value of shares granted |  |  |  | $ 17.53 | $ 24.23 | $ 21.35
Total fair value of shares vested |  |  |  | $ 10,166,000 | $ 11,165,000 | $ 6,992,000
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  |  | $ 26,742,000 |  |
Period over which unrecognized compensation cost is expected to be recognized as expense |  |  |  | 2 years 7 months 6 days |  |
Weighted-average grant date fair value of RSUs |  |  |  | $ 12,547,000 | 8,526,000 | 5,989,000
Stock options |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Employee Stock Purchase Plan, Purchase Price Percentage |  |  |  | 85.00% |  |
Issuance for employee stock purchase plan, shares |  |  |  | 22,627 |  |
Proceeds from issuances of common stock from employee stock purchase plans |  |  |  | $ 337,000 |  |
Employee stock purchase plan compensation expenses |  |  |  | 117,000 | $ 224,000 | $ 342,000
Unrecognized compensation cost related to outstanding options |  |  |  | $ 1,322,000 |  |
Period over which unrecognized compensation cost is expected to be recognized as expense |  |  |  | 1 year 1 month 6 days |  |

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