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Net Loss Per Share Attributable to Common Stockholders - Computation Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]                
Net loss $ (9,225) $ (3,083) $ (2,928) $ (3,169) $ (5,476) $ (11,236) $ (15,236) $ (19,882)
Less accretion of redeemable convertible preferred stock (5)     (22)     (56) (67)
Loss applicable to common stockholders, basic (9,230)     (3,191)     (15,292) (19,949)
Loss applicable to common stockholders, diluted $ (9,230)     $ (3,191)     $ (15,292) $ (19,949)
Weighted-average shares used in computing net loss per share attributable to common shareholders, basic (in shares) 47,712     13,182     25,038 13,134
Weighted-average shares used in computing net loss per share attributable to common shareholders, diluted (in shares) 47,712     13,182     25,038 13,134
Net loss per share attributable to ordinary shareholders, basic (in USD per share) $ (0.19)     $ (0.24)     $ (0.61) $ (1.52)
Net loss per share attributable to ordinary shareholders, diluted (in USD per share) $ (0.19)     $ (0.24)     $ (0.61) $ (1.52)