SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash, Cash equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Restricted security deposit	$ 5,450
Cash and cash equivalents	108,075	$ 78,229	$ 82,763
Restricted cash	6,430	6,084	6,084
Total cash, cash equivalents and restricted cash	114,505	$ 84,313	$ 88,847	$ 72,854
Commercial manufacturing facility
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Security deposit	5,450
Decrease in letters of credit	1,000
Commercial manufacturing facility | Minimum
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Security deposit	1,500
Headquarters lease
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Security deposit	$ 600