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STOCKHOLDERS' EQUITY - Incentive Plans (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 01, 2019 | Dec. 31, 2019 | Oct. 01, 2019 | Sep. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 29, 2020
Number of Shares |  |  |  |  |  |  |  |
Unvested outstanding shares at the beginning of the period (in shares) |  |  | 2,272,893 | 2,272,893 |  | 745,507 |  |
Granted (in shares) |  |  | 4,163,348 |  | 987,590 | 2,326,961 |  |
Vested (in shares) |  |  | (1,611,465) |  |  | (537,411) |  |
Accelerated vesting (in shares) |  |  | (2,724,086) |  |  |  |  |
Forfeited (in shares) |  |  | (2,100,690) |  | (113,456) | (262,164) |  |
Unvested outstanding shares at the end of the period (in shares) |  |  |  |  | 874,134 | 2,272,893 | 745,507 |
Weighted Average Grant Date fair Value Per Share |  |  |  |  |  |  |  |
Unvested outstanding shares at the beginning of the period (in dollars per share) |  |  | $ 5.80 | $ 5.80 |  | $ 7.05 |  |
Granted (in dollars per share) |  |  | 1.29 |  | $ 9.46 | 5.47 |  |
Vested (in dollars per share) |  |  | 4.65 |  |  | 5.89 |  |
Accelerated vesting (in dollars per share) |  |  | 2.07 |  |  |  |  |
Forfeited (in dollars per share) |  |  | $ 2.58 |  | 9.36 | 6.29 |  |
Unvested outstanding shares at the end of the period (in dollars per share) |  |  |  |  | $ 9.48 | $ 5.80 | $ 7.05 |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |
Aggregate Intrinsic Value at the beginning of the period (in dollars) |  |  | $ 3,864 | $ 3,864 |  | $ 5,643 |  |
Aggregate Intrinsic Value at the end of period (in dollars) |  |  |  |  | $ 3,287 | 3,864 | $ 5,643 |
Employees and non-employee directors |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Granted (in shares) |  | 0 |  |  |  |  |  |
General and administrative |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Allocated share based compensation credit |  |  | $ 8,000 |  |  |  |  |
Compensation expense recorded |  | $ 0 |  |  | $ 2,600 | $ 15,300 |  |
Stock options |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 7,468,926 | 7,468,926 |  | 6,735,903 |  |
Granted (in shares) |  |  |  |  | 557,844 | 1,206,800 |  |
Exercised (in shares) |  |  |  |  |  | (41,667) |  |
Forfeited (in shares) |  |  | (5,182,238) |  | (79,692) | (432,110) |  |
Cancelled (in shares) |  |  | (2,286,688) |  |  |  |  |
Outstanding at the end of the period (in shares) |  |  |  |  | 478,152 | 7,468,926 | 6,735,903 |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  | $ 8.34 | $ 8.34 |  | $ 8.84 |  |
Granted (in dollars per share) |  |  |  |  | $ 28.32 | 5.65 |  |
Exercised (in dollars per share) |  |  |  |  |  | 7.75 |  |
Forfeited (in dollars per share) |  |  | 8.38 |  | 28.32 | 8.68 |  |
Cancelled (in dollars per share) |  |  | $ 8.26 |  |  |  |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  | $ 28.32 | $ 8.34 | $ 8.84 |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |
Outstanding at the beginning of the period |  |  | $ 29 | $ 29 |  | $ 29 |  |
Aggregate Intrinsic Value |  |  | 29 | $ 29 |  | 29 | $ 29 |
Outstanding at the end of the period |  |  |  |  |  | $ 29 | $ 29 |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |
Outstanding at the end of the period |  |  |  |  | 6 years 2 months 12 days | 8 years 1 month 6 days | 8 years 10 months 24 days |
2016 Incentive Plan |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Incremental reduction to stock-based compensation expense |  |  | 9,500 |  |  |  |  |
2016 Incentive Plan | Common Stock | Maximum |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Maximum number of shares that remained reserved for issuance under the Plan |  |  |  |  | 200,000 |  |  |
2016 Incentive Plan | Stock options |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |
Granted (in shares) | 0 | 0 |  | 0 |  |  |  |
2016 Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |
Additional Disclosures |  |  |  |  |  |  |  |
Total fair value of shares vested |  |  | $ 1,800 |  |  | $ 2,000 |  |
2020 Incentive Plan | Common Stock |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |
Aggregate number of shares available |  |  |  |  |  |  |  | 1,500,000

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