SHAREHOLDERS' EQUITY - Equity Distribution Agreements (Details) - Private placement - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Nov. 26, 2019
Equity incentive plans
Common stock issued in offering			$ 30,000
Shares sold in offering (in shares)	111,963	694,298
Aggregate sales price	$ 1,966	$ 12,077
Payments for commissions and offering related expenses	$ 56	$ 185