Quarterly report pursuant to Section 13 or 15(d)

STOCK-BASED COMPENSATION - Share-based Compensation Expense (Details)

v3.21.2
STOCK-BASED COMPENSATION - Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense $ 421 $ 453 $ 890 $ 856
Research and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense 88 68 197 172
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Share-based compensation expense $ 333 $ 385 $ 693 $ 684