REDEEMABLE CONVERTIBLE PREFERRED STOCK (Details) - $ / shares		12 Months Ended
	Aug. 16, 2019	Dec. 31, 2019	Aug. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock, authorized (in shares)			10,000,000
Preferred stock, par value (in usd per share)			$ 0.01
50-day trading volume on Nasdaq stock market (in shares)		50,000
Series 1 redeemable convertible non-voting preferred stock
Class of Stock [Line Items]
Preferred stock, authorized (in shares)			1,517,500
Preferred stock, outstanding (in shares)		538,000		0
Preferred stock, issued (in shares)		538,000		0
Shares issuable per warrants (in shares)		10
Conversion of redeemable convertible preferred stock into common stock (in shares)		37,000
Series 2 redeemable convertible non-voting preferred stock
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)		0		0
Preferred stock, issued (in shares)		0		0
Series 2 redeemable convertible non-voting preferred stock | Private Placement
Class of Stock [Line Items]
Number of shares of common stock sold in offering (in shares)	350,000
Price per share (in dollars per share)	$ 100.00
Series 3 redeemable convertible non-voting preferred stock
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)		0		0
Preferred stock, issued (in shares)		0		0
Closing price of common stock (in usd per share)		$ 35.00
Series 3 redeemable convertible non-voting preferred stock | Private Placement
Class of Stock [Line Items]
Number of shares of common stock sold in offering (in shares)	250,000
Series 1 and 2 Preferred Stock
Class of Stock [Line Items]
Price per share (in dollars per share)		100.00
Closing price of common stock (in usd per share)		25.00
Preferred Stock | Private Placement
Class of Stock [Line Items]
Price per share (in dollars per share)	$ 140.00	$ 140.00