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Net Loss Per Share Attributable to Common Stockholders - Computation of Basic and Diluted Net Loss per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net loss attributable to common stockholders $ (59,948) $ (14,505) $ (83,636) $ (14,423)
Denominator:        
Shares used in per share calculation - basic (in shares) 26,786 26,487 26,688 25,838
Dilutive effect of common stock (in shares) 0 0 0 0
Shares used in diluted share calculation (in shares) 26,786 26,487 26,688 25,838
Net loss attributable to common stockholders per share - basic (in usd per share) $ (2.24) $ (0.55) $ (3.13) $ (0.56)
Net loss attributable to common stockholders per share - diluted (in usd per share) $ (2.24) $ (0.55) $ (3.13) $ (0.56)