SUBSEQUENT EVENT (Details) - USD ($) $ in Thousands			1 Months Ended	12 Months Ended
	Feb. 11, 2021	Feb. 11, 2021	Jan. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Issuance of common stock, net				$ 63,614	$ 6,652
Cash balances				50,315	1,870
Subsequent Event
Issuance of common stock, net	$ 53,900
Cash balances	$ 101,000	$ 101,000
ATM Offering Agreement | Cantor Fitzgerald & Co
Issuance of common stock, net				$ 49,900	$ 400
ATM Offering Agreement | Cantor Fitzgerald & Co | Subsequent Event
Number of common stock issued			9,300,000
Issuance of common stock, net			$ 47,300
December 2020 PA | Lincoln Park | Subsequent Event
Number of common stock issued		900,000
Issuance of common stock, net		$ 6,600