PUBLIC OFFERING AND PRIVATE PLACEMENT - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions					1 Months Ended	12 Months Ended
	Dec. 04, 2021	Nov. 02, 2020	Aug. 21, 2019	Aug. 16, 2019	Aug. 31, 2019	Dec. 31, 2019	Mar. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Common stock, par value (in dollars per share)							$ 0.01	$ 0.01
Common stock, issued (in shares)							8,676,903	8,497,025
Proceeds from issuance of redeemable convertible preferred stock in a public offering, net			$ 53.8
Proceeds upon entering into private placement agreement						$ 11.2
Series 1 Preferred
Class of Stock [Line Items]
Shares issuable per warrants (in shares)							10
Price per share (in dollars per share)							$ 100.00
Number of shares of common stock sold in offering (in shares)					1,517,500
December 2021 Private Placement
Class of Stock [Line Items]
Shares issuable per warrants (in shares)	20,559,210
Warrants to purchase aggregate shares of common stock (in shares)	2,055,920
Shares purchased by selling pre-funded warrant (in shares)	0.1
Price per share (in dollars per share)	$ 1.7024
Common stock, par value (in dollars per share)	0.0001
Warrant exercise price (in dollars per share)	$ 1.69
Expiration period	7 years
Proceeds from issuance of stock	$ 35.0
December 2021 Private Placement | Pre-Funded Warrant
Class of Stock [Line Items]
Shares purchased by selling pre-funded warrant (in shares)	1
November 2020 Underwritten Offering
Class of Stock [Line Items]
Shares issuable per warrants (in shares)		3,109,378
Warrants to purchase aggregate shares of common stock (in shares)		4,149,378
Shares purchased by selling pre-funded warrant (in shares)		1
Common stock, par value (in dollars per share)		$ 0.001
Warrant exercise price (in dollars per share)		$ 6.50
Expiration period		5 years
Proceeds from issuance of stock		$ 25.0
Common stock, issued (in shares)		1,040,000
November 2020 Underwritten Offering | Minimum
Class of Stock [Line Items]
Price of each share of common stock and accompanying common warrant (in dollars per share)		$ 6.024
November 2020 Underwritten Offering | Maximum
Class of Stock [Line Items]
Price of each share of common stock and accompanying common warrant (in dollars per share)		$ 6.025
Public Offering
Class of Stock [Line Items]
Price per share (in dollars per share)				$ 100.00
Shares issuable under warrants (in shares)				5,750,000
Public Offering | Series 1 Preferred
Class of Stock [Line Items]
Number of shares of common stock sold in offering (in shares)				575,000
Weighted average exercise price (in dollars per share)				$ 130.00
Public Offering | Common Stock
Class of Stock [Line Items]
Shares issuable per warrants (in shares)				10
Weighted average exercise price (in dollars per share)				$ 13.00
Class of warrant or right, notice period for percentage change				61 days
Public Offering | Minimum | Common Stock
Class of Stock [Line Items]
Warrants, limitations on ownership after exercise				9.99%
Public Offering | Maximum | Common Stock
Class of Stock [Line Items]
Warrants, limitations on ownership after exercise				19.99%
Private placement option | Series 2 redeemable convertible non-voting preferred stock
Class of Stock [Line Items]
Price per share (in dollars per share)				$ 100.00
Number of shares of common stock sold in offering (in shares)				350,000	350,000
Shares issuable under warrants (in shares)				2,800,000
Weighted average exercise price (in dollars per share)				$ 10.00
Private placement option | Series 3 redeemable convertible non-voting preferred stock
Class of Stock [Line Items]
Number of shares of common stock sold in offering (in shares)				250,000	250,000
Private placement option | Preferred Stock
Class of Stock [Line Items]
Price per share (in dollars per share)				$ 140.00
Shares issuable under warrants (in shares)				875,000
Weighted average exercise price (in dollars per share)				$ 14.00