COMMON STOCK - Common Stock Issued, Net of Issuance Costs (Details) - USD ($) $ / shares in Units, $ in Thousands					3 Months Ended		9 Months Ended
	Jul. 08, 2021	May 21, 2021	Dec. 04, 2020	Apr. 14, 2017	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Net proceeds from common stock							$ 4,130	$ 25,604
Aggregate offering price					$ 1,150	$ 1,063	$ 4,130	$ 25,604
Common stock, shares issued					53,382,813		53,382,813		48,405,543
Aggregate proceeds					$ 53		$ 53		$ 48
2020 Lincoln Park PA
Maximum aggregate offering price			$ 100,000
Registered share available for future sales			16,000,000.0
Period for financing from common stock			36 months
Number of common stock issued					0	0	900,000	0
Net proceeds from common stock							$ 800
Threshold average sale price per share of common stock			$ 6.15
Minimum percentage considered for not to sale common stock							9.99%
Common stock, shares issued					7,100,000		7,100,000
2020 Lincoln Park PA | Minimum
Percentage of common stock issuable		19.99%
2020 Lincoln Park PA | Maximum
Percentage of common stock issuable			19.99%
ATM Offering Agreement
Net proceeds from common stock	$ 50,000
ATM Offering Agreement | Maximum
Aggregate offering price							$ 17,300
ATM Offering Agreement | Cantor Fitzgerald & Co
Number of common stock issued					1,400,000	800,000	3,700,000	12,600,000
Net proceeds from common stock					$ 1,200	$ 1,100	$ 3,300	$ 25,600
Gross proceeds during the company subject to General Instruction I.B.6 of Form S-3							1,900
Aggregate proceeds					$ 32,600		32,600
ATM Offering Agreement | Cantor Fitzgerald & Co | Maximum
Net proceeds from common stock							$ 17,300
Sales commission percentage				2.50%