Condensed Consolidated Statements of Redeemable Common Stock, Stock Options, Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) - USD ($) $ in Thousands	Total	Redeemable Common Stock	Notes Receivable for Redeemable Common Stock Issued	Redeemable Stock Options	Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Notes Receivable for Common Stock Issued	Accumulated Other Comprehensive Loss	Accumulated Deficit
Temporary Equity, Beginning Balance, Amount at Dec. 31, 2020		$ 80,780	$ 803	$ 53,085	$ 353,300
Temporary Equity, Beginning Balance, Shares at Dec. 31, 2020		3,813,450			14,376,272
Stockholders' Equity, Beginning Balance, Amount at Dec. 31, 2020	$ (430,591)					$ 0			$ (3)	$ (430,588)
Stockholders' Equity, Beginning Balance, Shares at Dec. 31, 2020						1
Exercise of stock options		$ 6,922		(5,715)
Exercise of stock options, shares		280,545
Stock-based compensation expense	1,239						1,239
Unrealized gain on short-term investments and cash equivalents, net of tax	7								7
Foreign currency translation adjustment	(4)								(4)
Change in notes receivable for common stock issued			$ (14)
Reclassification of 4,093,995 shares of redeemable common stock to 4,093,995 shares of common stock	86,885	$ (87,702)				$ 4	87,698	(817)
Reclassification of 4,093,995 shares of redeemable common stock to 4,093,995 shares of common stock, shares		4,093,995	817			(4,093,995)
Reclassification of redeemable common stock options to common stock options	47,370			(47,370)			47,370
Net loss	(6,805)									(6,805)
Temporary Equity, Ending Balance, Amount at Mar. 31, 2021		$ 0	$ 0	$ 0	$ 353,300
Temporary Equity, Ending Balance, Shares at Mar. 31, 2021		0			14,376,272
Stockholders' Equity, Ending Balance, Amount at Mar. 31, 2021	(301,899)					$ 4	136,307	$ (817)		(437,393)
Stockholders' Equity, Ending Balance, Shares at Mar. 31, 2021						4,093,996
Stockholders' Equity, Beginning Balance, Amount at Dec. 31, 2021	$ 138,242					$ 27	617,511		(20)	(479,276)
Stockholders' Equity, Beginning Balance, Shares at Dec. 31, 2021	27,366,746					27,366,746
Shares issued for the exercise of stock options and vesting of restricted stock units, Amount	$ 308						308
Shares issued for the exercise of stock options and vesting of restricted stock units, Shares						145,922
Shares redeemed for employee tax withholdings						(26,983)
Value of shares redeemed for employee tax withholdings	(362)						(362)
Stock-based compensation expense	$ 2,649						2,649
Conversion of preferred stock to common stock upon initial public offering, net of fractional shares settled (in shares)	4,093,995
Unrealized gain on short-term investments and cash equivalents, net of tax	$ (74)								(74)
Foreign currency translation adjustment	(4)								(4)
Net loss	(17,596)									(17,596)
Stockholders' Equity, Ending Balance, Amount at Mar. 31, 2022	$ 123,163					$ 27	$ 620,106		$ (98)	$ (496,872)
Stockholders' Equity, Ending Balance, Shares at Mar. 31, 2022	27,485,685					27,485,685