STOCKHOLDERS' EQUITY - At-the-Market Equity Offering Program - Additional Information (Details) - USD ($)		3 Months Ended		12 Months Ended
	Aug. 10, 2018	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2020
Class Of Warrant Or Right [Line Items]
Issuance of common stock in public offering		$ 7,371,609	$ 5,178,460
Sales Agreement
Class Of Warrant Or Right [Line Items]
Sale of stock issue date				Aug. 10, 2018
Common Stock
Class Of Warrant Or Right [Line Items]
Issuance of common stock in public offering		$ 201	$ 136
Issuance of common stock in public offering (in shares)		2,019,652	1,361,956
Common Stock | Sales Agreement
Class Of Warrant Or Right [Line Items]
Issuance of common stock in public offering	$ 50,000,000.0
Issuance of common stock in public offering (in shares)				3,381,608
Common stock, average price per share				$ 3.7113
Net proceeds after deducting sales commissions and offering costs payable				$ 12,100,000