CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (Unaudited) - USD ($) $ in Thousands	Preferred Stock Series B Redeemable Convertible Preferred Stock	Preferred Stock Series C Redeemable Convertible Preferred Stock	Preferred Stock Series D Redeemable Convertible Preferred Stock	Preferred Stock Series A Convertible Preferred Stock	Common Stock Class A Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Accumulated Deficit	Total
Balance, beginning of period at Dec. 31, 2020	$ 11,500	$ 30,107	$ 27,500
Balance, beginning of period (in shares) at Dec. 31, 2020	13,715,330	26,732,361	16,390,217
Increase (Decrease) in Redeemable Convertible Preferred Stock and Stockholders' Equity [Roll Forward]
Accrued dividends	$ 180	$ 510	$ 500						$ 1,190
Balance, end of period at Mar. 31, 2021	$ 11,680	$ 30,617	$ 28,000
Balance, end of period (in shares) at Mar. 31, 2021	13,715,330	26,732,361	16,390,217
Balance, beginning of period at Dec. 31, 2020				$ 1,253		$ 1		$ (52,280)	(51,026)
Balance, beginning of period (in shares) at Dec. 31, 2020				5,013,333		2,563,765
Increase (Decrease) in Redeemable Convertible Preferred Stock and Stockholders' Equity [Roll Forward]
Exercise of stock options							$ 44		44
Exercise of stock options (in shares)						271,334
Accrued dividends							(298)	(892)	(1,190)
Net loss								(8,082)	(8,082)
Stock-based compensation							254		254
Balance, end of period at Mar. 31, 2021				$ 1,253		$ 1		(61,254)	(60,000)
Balance, end of period (in shares) at Mar. 31, 2021				5,013,333		2,835,099
Balance, beginning of period at Dec. 31, 2021					$ 2		217,456	(96,107)	121,351
Balance, beginning of period (in shares) at Dec. 31, 2021					37,424,101
Increase (Decrease) in Redeemable Convertible Preferred Stock and Stockholders' Equity [Roll Forward]
Exercise of stock options							55		55
Exercise of stock options (in shares)					78,257
Net loss								(16,399)	(16,399)
Stock-based compensation							1,545		1,545
Balance, end of period at Mar. 31, 2022					$ 2		$ 219,056	$ (112,506)	$ 106,552
Balance, end of period (in shares) at Mar. 31, 2022					37,502,358