STOCKHOLDERS' EQUITY - Preferred Stock (Details) - shares		1 Months Ended		12 Months Ended
	Apr. 25, 2019	Oct. 31, 2019	Apr. 30, 2019	Dec. 31, 2019
Number of shares of preferred stock designated			300,000
Series A Non-Voting Convertible Preferred Stock
Shares authorized			300,000
Convertible preferred stock, shares issued upon conversion			10
Conversion limitation, ownership percentage			9.90%
Conversion limitation for one transferee, percent of any class of voting securities			2.00%
Conversion limitation for one transferre, ownership percentage			50.00%
Conversion of stock, shares converted		150,000
Conversion of stock, shares issued	150,000
Value Act Holdings, L.P. | Series A Non-Voting Convertible Preferred Stock
Conversion of stock, shares converted		150,000		150,000
Conversion of stock, shares issued	150,000			150,000
Value Act Holdings, L.P. | Common Stock
Conversion of stock, shares converted	1,500,000			1,500,000