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Net Loss Per Share Attributable to Common Stockholders - Computation of EPS (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
May 21, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Class of Stock [Line Items]          
Weighted-average shares used in computing net loss per share attributable to common stockholder, basic (in shares)   116,475,000 105,942,000 115,320,000 100,413,000
Weighted-average shares used in computing net loss per share attributable to common stockholder, diluted (in shares)   116,475,000 105,942,000 115,320,000 100,413,000
Net loss per share attributable to common stockholders, basic (in US dollar per share)   $ (0.48) $ (0.22) $ (1.43) $ (0.50)
Net loss per share attributable to common stockholders, diluted (in US dollar per share)   $ (0.48) $ (0.22) $ (1.43) $ (0.50)
Common Class A          
Class of Stock [Line Items]          
Net loss attributable to common stockholders   $ (55,109) $ (20,763) $ (154,623) $ (39,670)
Weighted-average shares used in computing net loss per share attributable to common stockholder, basic (in shares)   114,218,000 92,510,000 107,952,000 79,307,000
Weighted-average shares used in computing net loss per share attributable to common stockholder, diluted (in shares)   114,218,000 92,510,000 107,952,000 79,307,000
Net loss per share attributable to common stockholders, basic (in US dollar per share)   $ (0.48) $ (0.22) $ (1.43) $ (0.50)
Net loss per share attributable to common stockholders, diluted (in US dollar per share)   $ (0.48) $ (0.22) $ (1.43) $ (0.50)
Common Class A | IPO          
Class of Stock [Line Items]          
Shares issued (in shares) 12,900,000        
Common Class B          
Class of Stock [Line Items]          
Net loss attributable to common stockholders   $ (1,089) $ (3,015) $ (10,553) $ (10,558)
Weighted-average shares used in computing net loss per share attributable to common stockholder, basic (in shares)   2,257,000 13,432,000 7,368,000 21,106,000
Weighted-average shares used in computing net loss per share attributable to common stockholder, diluted (in shares)   2,257,000 13,432,000 7,368,000 21,106,000
Net loss per share attributable to common stockholders, basic (in US dollar per share)   $ (0.48) $ (0.22) $ (1.43) $ (0.50)
Net loss per share attributable to common stockholders, diluted (in US dollar per share)   $ (0.48) $ (0.22) $ (1.43) $ (0.50)
Number of shares converted (in shares) 53,600,000   0   144,635,000