Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - Restricted Stock Agreements (Details)

v3.20.4
STOCKHOLDERS' EQUITY - Restricted Stock Agreements (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting of restricted Common Stock   $ 7 $ 8  
Vesting period   1 year    
Weighted-average remaining contractual term (in years)   7 years 9 months 7 years 10 months 2 days  
Amount of convertible notes issued $ 200      
Shares issues upon conversion 340,923      
Accrued interest rate 2.57%      
Repurchase of common stock 76,461      
Restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued       34,010,977
Share price       $ 0.0001
Vesting of restricted Common Stock (in shares)     607,300  
Vesting of restricted Common Stock     $ 2,000  
Vesting period     4 years  
Weighted-average remaining contractual term (in years)   7 months 6 days