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CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - Narratives (Details)		12 Months Ended
	Nov. 15, 2021 USD ($) shares	Dec. 31, 2021 vote $ / shares shares	Nov. 14, 2021 vote shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2016 shares
Class of Stock
Preferred stock, shares authorized (shares)			10,000,000
Public offering trigger for preferred stock conversion | $	$ 50,000,000
Warrants issued (shares)				430,080	430,080
Warrants and right term		10 years
2013 Warrants
Class of Stock
Warrant exercise price (usd per share) | $ / shares		$ 0.07
2016 Warrants
Class of Stock
Warrant exercise price (usd per share) | $ / shares		$ 0.53
Convertible preferred stock
Class of Stock
Shares converted (in shares)	42,031,390
Share conversion ratio	10
Common Stock, LT10
Class of Stock
Common stock, shares authorized (shares)		25,000,000	25,000,000	0
Common Stock, Voting Right Per Share | vote		10	10
Common Stock, LT50
Class of Stock
Common stock, shares authorized (shares)		25,000,000	25,000,000	0
Common Stock, Voting Right Per Share | vote		50	50
Series A
Class of Stock
Non-cumulative dividend rate (percent)		7.334%
Original issuance price (usd per share) | $ / shares		$ 0.9167		$ 0.9167
Shares of common stock each share of preferred stock can be converted to		10
Series B
Class of Stock
Non-cumulative dividend rate (percent)		21.432%
Original issuance price (usd per share) | $ / shares		$ 2.67903		2.67903
Shares of common stock each share of preferred stock can be converted to		10
Series B-1
Class of Stock
Non-cumulative dividend rate (percent)		44.37%
Original issuance price (usd per share) | $ / shares		$ 5.54619		5.54619
Shares of common stock each share of preferred stock can be converted to		10
Series C
Class of Stock
Non-cumulative dividend rate (percent)		124.54%
Original issuance price (usd per share) | $ / shares		$ 15.56770		$ 15.5677
Shares of common stock each share of preferred stock can be converted to		10
Common Class A
Class of Stock
Common stock, shares authorized (shares)		1,000,000,000	1,000,000,000	95,000,000
Common Stock, Voting Right Per Share | vote		1	1
Shares converted (in shares)		1
Shares issued on warrant conversion (shares)	428,067	0

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