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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