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Net Loss Per Share - Computation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator:      
Net loss $ (20,963) $ (12,528) $ (29,853)
Accretion of redeemable convertible preferred stock to redemption value (7,061) (15,095) (13,744)
Net loss attributable to common stockholders, basic (28,024) (27,623) (43,597)
Net loss attributable to common stockholders, diluted $ (28,024) $ (27,623) $ (43,597)
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]      
Weighted average common shares outstanding—basic (in shares) 26,059,744 11,034,620 10,772,486
Weighted average common shares outstanding—diluted (in shares) 26,059,744 11,034,620 10,772,486
Net loss per share attributable to common stockholders—basic (in usd per share) $ (1.08) $ (2.50) $ (4.05)
Net loss per share attributable to common stockholders—diluted (in usd per share) $ (1.08) $ (2.50) $ (4.05)