DEBT - Narrative (Details) - USD ($)		1 Months Ended	12 Months Ended
	Dec. 21, 2017	Nov. 30, 2020	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Payment on debt			$ 0	$ 37,155,000
Amortization of deferred issuance costs			0	550,000
Gain on extinguishment of debt			$ 0	112,000
Oxford Loan
Debt Instrument [Line Items]
Face amount borrowed	$ 35,000,000
Payment on debt		$ 27,400,000
Payment of debt issuance costs	100,000
Final facility charge payment	3,000,000
Amortization of deferred issuance costs				$ 600,000
Hercules Loan
Debt Instrument [Line Items]
Payment on debt	$ 32,900,000