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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 29, 2020 | Apr. 06, 2017
Restricted stock |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value of the shares granted |  |  | $ 5,400 |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |  |  |
Unvested outstanding shares at the beginning of the period (in shares) |  |  | 2,272,893 | 2,272,893 | 2,272,893 | 745,507 | 1,738,077 |  |  |
Granted (in shares) |  |  | 4,163,348 |  |  | 2,326,961 | 2,022,432 |  |  |
Vested (in shares) |  |  | (1,611,465) |  |  | (537,411) | (2,516,647) |  |  |
Accelerated vesting (in shares) |  |  | (2,724,086) |  |  |  |  |  |  |
Forfeited (in shares) |  |  | (2,100,690) |  |  | (262,164) | (498,355) |  |  |
Unvested outstanding shares at the end of the period (in shares) |  |  |  |  |  | 2,272,893 | 745,507 | 1,738,077 |  |
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 | $ 5.80 | $ 7.05 | $ 9.06 |  |  |
Granted (in dollars per share) |  |  | 1.29 |  |  | 5.47 | 7.07 |  |  |
Vested (in dollars per share) |  |  | 4.65 |  |  | 5.89 | 8.39 |  |  |
Accelerated vesting (in dollars per share) |  |  | 2.07 |  |  |  |  |  |  |
Forfeited (in dollars per share) |  |  | $ 2.58 |  |  | 6.29 | 7.41 |  |  |
Unvested outstanding shares at the end of the period (in dollars per share) |  |  |  |  |  | $ 5.80 | $ 7.05 | $ 9.06 |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |
Aggregate Intrinsic Value at the beginning of the period (in dollars) |  |  | $ 3,864 | $ 3,864 | $ 3,864 | $ 5,643 | $ 16,234 |  |  |
Aggregate Intrinsic Value at the end of period (in dollars) |  |  |  |  |  | 3,864 | 5,643 | $ 16,234 |  |
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 |  |  |  | $ 15,300 | $ 36,800 |  |  |
Stock options |  |  |  |  |  |  |  |  |  |
Number of Shares |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in shares) |  |  | 7,468,926 | 7,468,926 | 7,468,926 | 6,735,903 | 5,319,400 |  |  |
Granted (in shares) |  |  |  |  |  | 1,206,800 | 1,790,605 |  |  |
Exercised (in shares) |  |  |  |  |  | (41,667) |  |  |  |
Forfeited (in shares) |  |  | (5,182,238) |  |  | (432,110) | (374,102) |  |  |
Cancelled (in shares) |  |  | (2,286,688) |  |  |  |  |  |  |
Outstanding at the end of the period (in shares) |  |  |  |  |  | 7,468,926 | 6,735,903 | 5,319,400 |  |
Weighted Average Exercise Price Per Share |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period (in dollars per share) |  |  | $ 8.34 | $ 8.34 | $ 8.34 | $ 8.84 | $ 9.22 |  |  |
Granted (in dollars per share) |  |  |  |  |  | 5.65 | 7.72 |  |  |
Exercised (in dollars per share) |  |  |  |  |  | 7.75 |  |  |  |
Forfeited (in dollars per share) |  |  | 8.38 |  |  | 8.68 | 8.82 |  |  |
Cancelled (in dollars per share) |  |  | $ 8.26 |  |  |  |  |  |  |
Outstanding at the end of the period (in dollars per share) |  |  |  |  |  | $ 8.34 | $ 8.84 | $ 9.22 |  |
Aggregate Intrinsic Value |  |  |  |  |  |  |  |  |  |
Outstanding at the beginning of the period |  |  |  |  |  | $ 29 | $ 631 |  |  |
Exercised |  |  |  |  |  | $ 29 |  |  |  |
Outstanding at the end of the period |  |  |  |  |  |  | $ 29 | $ 631 |  |
Weighted Average Remaining Contractual Term |  |  |  |  |  |  |  |  |  |
Outstanding at the end of the period |  |  |  |  |  | 8 years 1 month 6 days | 8 years 10 months 24 days | 9 years 8 months 12 days |  |
2016 Incentive Plan |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |
Incremental reduction to stock-based compensation expense |  |  | $ 9,500 |  |  |  |  |  |  |
2016 Incentive Plan | Common Stock |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |
Aggregate number of shares available |  |  |  |  |  |  |  |  |  | 19,000,000
Maximum number of shares that remained reserved for issuance under the Plan |  |  |  |  |  | 4,900,000 |  |  |  |
2016 Incentive Plan | Stock options |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangements by Share Based Payment Award Options Annual Vesting Percentage. |  |  |  |  | 33.33% |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |  |
Expiration term |  |  |  |  | 10 years |  |  |  |  |
Weighted average remaining vesting period |  |  |  |  |  | 10 months 24 days | 1 year 2 months 12 days |  |  |
Weighted average grant date fair value of the shares granted |  |  |  |  |  | $ 3,500 | $ 7,800 |  |  |
Proceeds from stock options |  |  |  |  |  | 300 |  |  |  |
Number of Shares |  |  |  |  |  |  |  |  |  |
Granted (in shares) | 0 | 0 |  | 0 |  |  |  |  |  |
Restricted stock |  |  |  |  |  |  |  |  |  |
Unrecognized compensation expense stock option |  |  |  |  |  | $ 5,200 | $ 13,000 |  |  |
2016 Incentive Plan | Restricted Stock |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |
Percentage of awards other than options vesting on the annual anniversary date of the grant |  |  |  |  | 33.33% |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |  |  |  |
Weighted average remaining vesting period |  |  |  |  |  | 1 year 1 month 6 days | 1 year 4 months 24 days |  |  |
Unrecognized compensation expense other than options |  |  |  |  |  | $ 6,100 | $ 3,200 |  |  |
Restricted stock |  |  |  |  |  |  |  |  |  |
Weighted average grant date fair value of the shares granted |  |  |  |  |  | 12,700 | 14,300 |  |  |
Additional Disclosures |  |  |  |  |  |  |  |  |  |
Total fair value of shares vested |  |  | $ 1,800 |  |  | $ 2,000 | $ 16,100 |  |  |
2016 Incentive Plan | Restricted Stock | Non-employee director |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 6 months |  |  |  |  |
2020 Incentive Plan | Common Stock | Subsequent event |  |  |  |  |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |  |  |  |  |
Aggregate number of shares available |  |  |  |  |  |  |  |  | 1,500,000 |

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