CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT) - 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	Series B Redeemable Convertible Preferred Stock	Series C Redeemable Convertible Preferred Stock	Series D Redeemable Convertible Preferred Stock	Total
Balance, beginning of period at Dec. 31, 2019	$ 10,780	$ 28,067	$ 25,500
Balance, beginning of period (in shares) at Dec. 31, 2019	13,715,330	26,732,361	16,390,217
Increase (Decrease) in Redeemable Convertible Preferred Stock and Stockholders' Equity [Roll Forward]
Accrued dividends	$ 720	$ 2,040	$ 2,000									$ 4,760
Balance, end of period at Dec. 31, 2020	$ 11,500	$ 30,107	$ 27,500						$ 11,500	$ 30,107	$ 27,500
Balance, end of period (in shares) at Dec. 31, 2020	13,715,330	26,732,361	16,390,217
Balance, beginning of period at Dec. 31, 2019				$ 1,253		$ 1		$ (31,413)				(30,159)
Balance, beginning of period (in shares) at Dec. 31, 2019				5,013,333		2,286,872
Increase (Decrease) in Redeemable Convertible Preferred Stock and Stockholders' Equity [Roll Forward]
Exercise of stock options							$ 122					122
Exercise of stock options (in shares)						276,893
Accrued dividends							(599)	(4,161)				(4,760)
Net loss								(16,706)				(16,706)
Stock-based compensation							477					477
Balance, end of period at Dec. 31, 2020				$ 1,253		$ 1		(52,280)				(51,026)
Balance, end 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]
Accrued dividends	$ 217	$ 615	$ 603									1,435
Conversion of preferred stock into common stock in connection with the IPO	$ (11,717)	$ (30,722)	$ (28,103)
Conversion of preferred stock into common stock in connection with the IPO (in shares)	(13,715,330)	(26,732,361)	(16,390,217)
Conversion of Class B shares					$ 1	$ (1)
Conversion of Class B shares (in shares)					2,835,099	(2,835,099)
Exercise of stock options							394					394
Exercise of stock options (in shares)					476,423	271,334
Accrued dividends							(543)	(892)				(1,435)
Initial public offering of common stock							138,553					138,553
Initial public offering of common stock (in shares)					7,567,000
Conversion of preferred stock into common stock in connection with the IPO				$ (1,253)	$ 1		71,794					70,542
Conversion of preferred stock into common stock in connection with the IPO (in shares)				(5,013,333)	26,545,579
Reclassification of warrant liability to equity							3,219					3,219
Net loss								(42,935)				(42,935)
Stock-based compensation							4,039					4,039
Balance, end of period at Dec. 31, 2021					$ 2		$ 217,456	$ (96,107)				$ 121,351
Balance, end of period (in shares) at Dec. 31, 2021					37,424,101