Quarterly report pursuant to Section 13 or 15(d)

EQUITY-BASED COMPENSATION - Compensation expense and unrecognized compensation (Details)

v3.21.2
EQUITY-BASED COMPENSATION - Compensation expense and unrecognized compensation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based employee compensation expense $ 1,119 $ 306 $ 2,871 $ 1,162
Unrecognized compensation 5,931   $ 5,931  
Unrecognized compensation, period for recognition     1 year 1 month 6 days  
Unrecognized compensation, options with milestone-based vesting 517   $ 517  
Selling, General and Administrative Expenses [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based employee compensation expense 1,073 278 2,750 1,051
Research and Development Expense [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity-based employee compensation expense $ 46 $ 28 $ 121 $ 111