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Condensed Consolidated Statements of Stockholders' Equity - USD ($)
$ in Thousands
Total
Cumulative effect adjustment
Common Stock
Common Stock-Class A
Common Stock
Common Stock-Class B
Additional Paid-In Capital
Additional Paid-In Capital
Cumulative effect adjustment
Accumulated Deficit
Accumulated Deficit
Cumulative effect adjustment
Beginning balance (in shares) at Dec. 31, 2020     69,475,511 23,179,274        
Balance at Dec. 31, 2020 $ 315,572 $ (42,399) $ 1 $ 0 $ 913,115 $ (45,452) $ (597,544) $ 3,053
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options (in shares)     589,978          
Issuance of common stock upon exercise of stock options 4,680       4,680      
Issuance of restricted stock awards (in shares)     4,137          
Issuance of common stock for settlement of RSUs (in shares)     386,894          
Shares withheld related to net share settlement (in shares)     (140,325)          
Shares withheld related to the net share settlement (2,611)       (2,611)      
Conversion of common stock from Class B to Class A (in shares)     2,702,492 (2,702,492)        
Purchase of 2026 Capped Calls on 2026 Notes (18,509)       (18,509)      
Stock-based compensation 11,450       11,450      
Net loss (84,891)           (84,891)  
Ending balance (in shares) at Mar. 31, 2021     73,018,687 20,476,782        
Balance at Mar. 31, 2021 183,292   $ 1 $ 0 862,673   (679,382)  
Beginning balance (in shares) at Dec. 31, 2020     69,475,511 23,179,274        
Balance at Dec. 31, 2020 315,572 $ (42,399) $ 1 $ 0 913,115 $ (45,452) (597,544) $ 3,053
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net loss (122,244)              
Ending balance (in shares) at Sep. 30, 2021     76,101,055 18,730,951        
Balance at Sep. 30, 2021 170,458   $ 1 $ 0 887,192   (716,735)  
Beginning balance (in shares) at Mar. 31, 2021     73,018,687 20,476,782        
Balance at Mar. 31, 2021 183,292   $ 1 $ 0 862,673   (679,382)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options (in shares)     446,032          
Issuance of common stock upon exercise of stock options 3,111       3,111      
Cancellation of restricted stock awards (in shares)     (73,829)          
Issuance of common stock for settlement of RSUs (in shares)     517,686          
Issuance of common stock for 2018 Employee Stock Purchase Plan (ESPP) Purchase (in shares)     52,227          
Issuance of common stock for 2018 Employee Stock Purchase Plan (ESPP) Purchase 730       730      
Shares withheld related to net share settlement (in shares)     (170,698)          
Shares withheld related to the net share settlement (3,981)       (3,981)      
Conversion of common stock from Class B to Class A (in shares)     1,741,362 (1,741,362)        
Stock-based compensation 12,508       12,508      
Net loss (20,540)           (20,540)  
Ending balance (in shares) at Jun. 30, 2021     75,531,467 18,735,420        
Balance at Jun. 30, 2021 175,120   $ 1 $ 0 875,041   (699,922)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options (in shares)     285,502          
Issuance of common stock upon exercise of stock options 2,460       2,460      
Issuance of restricted stock awards (in shares)     5,063          
Issuance of common stock for settlement of RSUs (in shares)     430,127          
Shares withheld related to net share settlement (in shares)     (155,573)          
Shares withheld related to the net share settlement (2,767)       (2,767)      
Conversion of common stock from Class B to Class A (in shares)     4,469 (4,469)        
Stock-based compensation 12,458       12,458      
Net loss (16,813)           (16,813)  
Ending balance (in shares) at Sep. 30, 2021     76,101,055 18,730,951        
Balance at Sep. 30, 2021 $ 170,458   $ 1 $ 0 887,192   (716,735)  
Beginning balance (in shares) at Dec. 31, 2021 97,246,465   79,524,112 17,722,353        
Balance at Dec. 31, 2021 $ 169,900   $ 1 $ 0 903,470   (733,571)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options (in shares)     207,361          
Issuance of common stock upon exercise of stock options 1,464       1,464      
Issuance of restricted stock awards (in shares)     2,515          
Issuance of common stock for settlement of RSUs (in shares)     341,723          
Shares withheld related to net share settlement (in shares)     (117,374)          
Shares withheld related to the net share settlement (1,711)       (1,711)      
Conversion of common stock from Class B to Class A (in shares)     3,266 (3,266)        
Conversion of common stock from Class B to Class A 0              
Stock-based compensation 12,968       12,968      
Net loss (18,185)           (18,185)  
Ending balance (in shares) at Mar. 31, 2022     79,961,603 17,719,087        
Balance at Mar. 31, 2022 $ 164,436   $ 1 $ 0 916,191   (751,756)  
Beginning balance (in shares) at Dec. 31, 2021 97,246,465   79,524,112 17,722,353        
Balance at Dec. 31, 2021 $ 169,900   $ 1 $ 0 903,470   (733,571)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options (in shares) 364,844              
Net loss $ (59,397)              
Ending balance (in shares) at Sep. 30, 2022 98,679,389   81,039,222 17,640,167        
Balance at Sep. 30, 2022 $ 150,116   $ 1 $ 0 943,083   (792,968)  
Beginning balance (in shares) at Mar. 31, 2022     79,961,603 17,719,087        
Balance at Mar. 31, 2022 164,436   $ 1 $ 0 916,191   (751,756)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options (in shares)     156,014          
Issuance of common stock upon exercise of stock options 1,405       1,405      
Issuance of restricted stock awards (in shares)     39,795          
Issuance of common stock for settlement of RSUs (in shares)     559,321          
Issuance of common stock for 2018 Employee Stock Purchase Plan (ESPP) Purchase (in shares)     79,282          
Issuance of common stock for 2018 Employee Stock Purchase Plan (ESPP) Purchase 790       790      
Shares withheld related to net share settlement (in shares)     (195,195)          
Shares withheld related to the net share settlement (2,084)       (2,084)      
Conversion of common stock from Class B to Class A (in shares)     1,218 (1,218)        
Stock-based compensation 14,356       14,356      
Net loss (20,088)           (20,088)  
Ending balance (in shares) at Jun. 30, 2022     80,602,038 17,717,869        
Balance at Jun. 30, 2022 158,815   $ 1 $ 0 930,658   (771,844)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Issuance of common stock upon exercise of stock options (in shares)     28,708          
Issuance of common stock upon exercise of stock options 158       158      
Issuance of restricted stock awards (in shares)     7,185          
Issuance of common stock for settlement of RSUs (in shares)     506,715          
Shares withheld related to net share settlement (in shares)     (183,126)          
Shares withheld related to the net share settlement (1,543)       (1,543)      
Conversion of common stock from Class B to Class A (in shares)     77,702 (77,702)        
Conversion of common stock from Class B to Class A 0              
Stock-based compensation 13,810       13,810      
Net loss $ (21,124)           (21,124)  
Ending balance (in shares) at Sep. 30, 2022 98,679,389   81,039,222 17,640,167        
Balance at Sep. 30, 2022 $ 150,116   $ 1 $ 0 $ 943,083   $ (792,968)