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STOCK-BASED COMPENSATION - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 1,698 | $ 2,056 | $ 3,233
Unrecognized compensation cost | 2,048 |  |
ESPP |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 34 | 10 | 46
Stock options |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 242 | 0 | 305
Unrecognized compensation cost | $ 1,328 |  |
Weighted-Average Amortization Period (Years) | 3 years 4 months 24 days |  |
RSUs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 1,149 | 1,431 | 1,650
Unrecognized compensation cost | $ 351 |  |
Weighted-Average Amortization Period (Years) | 3 months 18 days |  |
RSAs |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 273 | 615 | 1,920
Unrecognized compensation cost | $ 369 |  |
Weighted-Average Amortization Period (Years) | 2 years 4 months 24 days |  |
Market-based RSUs (PSUs) |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 0 | 0 | (224)
Market-based RSAs (PSAs) |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | 0 | 0 | (464)
Market-based awards | Senior Management |  |  |
Stock-based compensation |  |  |
Stock based compensation reversed |  |  | 1,700
General and administrative |  |  |
Stock-based compensation |  |  |
Total stock-based compensation expense | $ 1,698 | $ 2,056 | $ 3,233

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