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INCOME TAXES - Effective Income Tax Rate Reconciliation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]      
Income tax benefit at the federal statutory rate of 21% $ (10,907) $ (10,458) $ (15,799)
State income taxes, net of effect of federal tax benefit (138) (159) 31
Change in valuation allowance 16,883 14,711 16,464
Stock-based compensation (4,041) (2,979) 299
Research credit (2,163) (1,439) (1,049)
Transaction costs 698 573 2
Other, net 496 579 397
Income tax provision $ 828 $ 828 $ 345