LIQUIDITY (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
	Aug. 20, 2021	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Dec. 04, 2020
Cash balances		$ 109,038		$ 109,038		$ 115,293
Issuance of common stock, net				$ 24,541	$ 77,863
2020 Lincoln Park PA
Number of common stock issued		0	1,200,000	0	5,000,000.0
Issuance of common stock, net			$ 5,700		$ 30,600
Registered share available for future sales							16,000,000.0
ATM Offering Agreement
Number of common stock issued		4,400,000		11,800,000	9,300,000
Issuance of common stock, net	$ 50,000	$ 9,000		$ 24,500	$ 47,300