REDEEMABLE CONVERTIBLE PREFERRED STOCK - Narrative (Details) - $ / shares		1 Months Ended	12 Months Ended
	Aug. 16, 2019	Aug. 31, 2019	Dec. 31, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock, authorized (in shares)		10,000,000
Preferred stock, par value (in dollars per share)		$ 0.01
Closing price of common stock threshold period			180 days
Average trading volume period			50 days
50-day trading volume on Nasdaq stock market (in shares)			50,000
Series 1 Preferred
Class of Stock [Line Items]
Preferred stock, authorized (in shares)		1,517,500
Preferred stock, outstanding (in shares)			452,000	452,000
Preferred stock, issued (in shares)			452,000	452,000
Price per share (in dollars per share)			$ 100.00
Shares issuable per warrants (in shares)		10	10
Conversion of redeemable convertible preferred stock into common stock (in shares)			0	86,000
Closing price of common stock (in dollars per share)			$ 25.00
Closing price of common stock threshold period			180 days
Series 2 redeemable convertible non-voting preferred stock
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)				0
Preferred stock, issued (in shares)				0
Series 2 redeemable convertible non-voting preferred stock | Private placement option
Class of Stock [Line Items]
Number of shares of common stock sold in offering (in shares)	350,000	350,000
Price per share (in dollars per share)	$ 100.00	$ 100.00
Series 3 redeemable convertible non-voting preferred stock
Class of Stock [Line Items]
Preferred stock, outstanding (in shares)				0
Preferred stock, issued (in shares)				0
Series 3 redeemable convertible non-voting preferred stock | Private placement option
Class of Stock [Line Items]
Number of shares of common stock sold in offering (in shares)	250,000	250,000