CONSOLIDATED STATEMENTS OF REDEEMABLE CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS’ EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	IPO	Underwriters' option	Follow-on Public Offering	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital IPO	Additional Paid-in Capital Underwriters' option	Additional Paid-in Capital Follow-on Public Offering	Accumulated Other Comprehensive Loss	Accumulated Deficit	Series A	Series A-1	Series B convertible preferred stock Preferred Stock	Class A Common Stock Common Stock	Class A Common Stock Common Stock IPO	Class A Common Stock Common Stock Underwriters' option	Class A Common Stock Common Stock Follow-on Public Offering	Class B Common Stock Common Stock
Beginning balance (in shares) at Dec. 31, 2018												3,379,400	0
Beginning balance at Dec. 31, 2018												$ 7,789	$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Issuance of Series A-1 redeemable convertible preferred stock upon exercise of share purchase option (in shares)													1,837,600
Issuance of Series A-1 redeemable convertible preferred stock upon exercise of share purchase option													$ 10,270
Ending balance (in shares) at Dec. 31, 2019												3,379,400	1,837,600
Ending balance at Dec. 31, 2019												$ 7,789	$ 10,270
Beginning balance (in shares) at Dec. 31, 2018					94,469,400									4,681,400	0				0
Beginning balance at Dec. 31, 2018	$ 8,406				$ 0	$ 3,043				$ 0	$ (18,637)			$ 24,000	$ 0				$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					123,300
Issuance of common stock upon exercise of stock options	97					97
Stock-based compensation expense	504					504
Cumulative translation adjustment	0
Net loss	(10,166)										(10,166)
Ending balance (in shares) at Dec. 31, 2019					94,592,700									4,681,400	0				0
Ending balance at Dec. 31, 2019	(1,159)				$ 0	3,644				0	(28,803)			$ 24,000	$ 0				$ 0
Ending balance (in shares) at Dec. 31, 2020												3,379,400	1,837,600
Ending balance at Dec. 31, 2020												$ 7,789	$ 10,270
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)					457,341
Issuance of common stock upon exercise of stock options	252					252
Stock-based compensation expense	1,079					1,079
Cumulative translation adjustment	0
Net loss	(7,012)										(7,012)
Ending balance (in shares) at Dec. 31, 2020					95,050,041									4,681,400	0				0
Ending balance at Dec. 31, 2020	$ (6,840)				$ 0	4,975				0	(35,815)			$ 24,000	$ 0				$ 0
Increase (Decrease) in Temporary Equity [Roll Forward]
Conversion of Preferred Stock (in shares)												(3,379,400)	(1,837,600)
Conversion of Preferred Stock												$ (7,789)	$ (10,270)
Ending balance (in shares) at Dec. 31, 2021												0	0
Ending balance at Dec. 31, 2021												$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock upon exercise of stock options (in shares)	1,195,942																		1,194,918
Issuance of common stock upon exercise of stock options	$ 1,327					1,327
Conversion of preferred stock (in shares)					29,695,200									(4,681,400)	17,121,795				(17,121,795)
Conversion of Preferred Stock	18,058					42,058								$ (24,000)
Issuance of Class A Common Stock (in shares)																10,000,000	719,266	4,000,000
Issuance of Class A Common Stock (in shares)		$ 126,622	$ 9,245	$ 77,903			$ 126,622	$ 9,245	$ 77,903
Reclassification of Common Stock to Class B Common Stock in connection with the Initial Public Offering (in shares)					(124,745,241)														124,745,241
Reclassification of Common Stock to Class B Common Stock in connection with the initial public offering						(1)													$ 1
Stock-based compensation expense	2,742					2,742
Vesting of Class B Common Stock in connection with Restricted Stock Awards (in shares)																			51,762
Cumulative translation adjustment	(230)									(230)
Net loss	(3,285)										(3,285)
Ending balance (in shares) at Dec. 31, 2021					0									0	31,841,061				108,870,126
Ending balance at Dec. 31, 2021	$ 225,542				$ 0	$ 264,871				$ (230)	$ (39,100)			$ 0	$ 0				$ 1