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STOCK-BASED COMPENSATION - Compensation Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock options |  |  |
Number of outstanding options |  |  |
Balance at the beginning of the period (in shares) | 1,087 |  |
Granted (in shares) | 250 | 0 | 0
Exercised (in shares) | (30) |  |
Released RSUs/RSAs (in shares) | 0 |  |
Forfeited (in shares) | (152) |  |
Balance at the end of the period (in shares) | 1,155 | 1,087 |
Weighted-Average Exercise Price of Outstanding Options |  |  |
Balance at the beginning of the period (in dollars per share) | $ 24.18 |  |
Granted (in dollars per share) | 14.10 |  |
Exercised (in dollars per share) | 12.30 |  |
Released RSUs/RSAs (in shares) | 0 |  |
Forfeited (in dollars per share) | 24.43 |  |
Balance at the end of the period (in dollars per share) | $ 22.28 | $ 24.18 |
Additional disclosures |  |  |
Aggregate intrinsic value of options outstanding | $ 0.0 |  |
Aggregate intrinsic value of options exercisable | $ 0.0 |  |
Weighted average remaining contractual term of options outstanding | 3 years 8 months 8 days |  |
Weighted average remaining contractual term of options exercisable | 3 years 8 months 8 days |  |
Total intrinsic value of options exercised | $ 0.1 | $ 0.2 | $ 0.4
Total estimated fair value of options vested |  |  | 0.8
RSUs |  |  |
Number of outstanding RSUs and PSUs/RSAs and PSAs |  |  |
Balance at the beginning of the period (in shares) | 94 |  |
Granted (in shares) | 85 |  |
Exercised (in shares) | 0 |  |
Released RSUs and RSAs (in shares) | (94) |  |
Forfeited (in shares) | 0 |  |
Balance at the end of the period (in shares) | 85 | 94 |
Weighted-Average Fair Value per Share at Grant |  |  |
Balance at the beginning of the period (in dollars per share) | $ 13.94 |  |
Granted (in dollars per share) | 13.30 |  |
Exercised (in dollars per share) | 0 |  |
Released RSUs and RSAs (in dollars per share) | 13.94 |  |
Forfeited (in dollars per share) | 0 |  |
Balance at the end of the period (in dollars per share) | $ 13.30 | $ 13.94 |
Additional disclosures |  |  |
Total estimated fair value of equity instruments vested | $ 1.3 | $ 1.4 | 2.6
RSAs |  |  |
Number of outstanding RSUs and PSUs/RSAs and PSAs |  |  |
Balance at the beginning of the period (in shares) | 78 |  |
Granted (in shares) | 31 |  |
Exercised (in shares) | 0 |  |
Released RSUs and RSAs (in shares) | (28) |  |
Forfeited (in shares) | (51) |  |
Balance at the end of the period (in shares) | 30 | 78 |
Weighted-Average Fair Value per Share at Grant |  |  |
Balance at the beginning of the period (in dollars per share) | $ 14.46 |  |
Granted (in dollars per share) | 14.30 |  |
Exercised (in dollars per share) | 0 |  |
Released RSUs and RSAs (in dollars per share) | 13.92 |  |
Forfeited (in dollars per share) | 14.56 |  |
Balance at the end of the period (in dollars per share) | $ 14.61 | $ 14.46 |
Additional disclosures |  |  |
Total estimated fair value of equity instruments vested | $ 0.6 | $ 0.9 | $ 7.6

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