Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders’ (Deficit) Equity (unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Redeemable Convertible Preferred Stock Series A Redeemable Convertible Preferred Stock	Redeemable Convertible Preferred Stock Series B Redeemable Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Deficit
Redeemable convertible preferred stock outstanding, beginning balance (shares) at Dec. 31, 2020		80,247	78,222
Redeemable convertible preferred stock outstanding, beginning balance at Dec. 31, 2020		$ 69,012	$ 72,070
Increase (Decrease) in Temporary Equity [Roll Forward]
Accretion of redeemable convertible preferred stock to redemption value		$ 49,753	$ 45,263
Redeemable convertible preferred stock outstanding, ending balance (shares) at Mar. 31, 2021		80,247	78,222
Redeemable convertible preferred stock outstanding, ending balance at Mar. 31, 2021		$ 118,765	$ 117,333
Stockholders' equity, beginning balance (shares) at Dec. 31, 2020				1,746
Stockholders' equity, beginning balance at Dec. 31, 2020	$ (51,863)			$ 2	$ 0	$ (51,865)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	539				539
Exercise of common stock options (shares)				14
Stock option exercises	21				21
Adjustments to Additional Paid in Capital, Increase in Carrying Amount of Redeemable Preferred Stock	(95,016)				(560)	(94,456)
Net income (loss)	(7,435)					(7,435)
Stockholders' equity, ending balance (shares) at Mar. 31, 2021				1,760
Stockholders' equity, ending balance at Mar. 31, 2021	(153,754)			$ 2	0	(153,756)
Redeemable convertible preferred stock outstanding, beginning balance (shares) at Dec. 31, 2021		0	0
Redeemable convertible preferred stock outstanding, beginning balance at Dec. 31, 2021		$ 0	$ 0
Redeemable convertible preferred stock outstanding, ending balance (shares) at Mar. 31, 2022		0	0
Redeemable convertible preferred stock outstanding, ending balance at Mar. 31, 2022		$ 0	$ 0
Stockholders' equity, beginning balance (shares) at Dec. 31, 2021				27,608
Stockholders' equity, beginning balance at Dec. 31, 2021	152,787			$ 2	405,680	(252,895)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation expense	$ 1,745				1,745
Exercise of common stock options (shares)	46			46
Stock option exercises	$ 129				129
Net income (loss)	(15,343)					(15,343)
Stockholders' equity, ending balance (shares) at Mar. 31, 2022				27,654
Stockholders' equity, ending balance at Mar. 31, 2022	$ 139,318			$ 2	$ 407,554	$ (268,238)