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Stock-based Compensation - Schedule of RSU Activity (Detail) - 2018 Equity Incentive Plan [Member] - $ / shares
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Time-based RSU [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share equivalent, Beginning Balance 1,423,392  
Share equivalent, Granted 2,024,334 944,616
Share equivalent, Vested (396,051) (54,635)
Share equivalent, Forfeited (785,641)  
Share equivalent, Cancelled (17,711)  
Share equivalent, Ending Balance 2,248,323  
Weighted-average grant date fair value, Beginning Balance $ 42.05  
Weighted-average grant date fair value, Granted 8.67  
Weighted-average grant date fair value, Vested 45.32  
Weighted-average grant date fair value, Forfeited 27.88  
Weighted-average grant date fair value, Cancelled 31.31  
Weighted-average grant date fair value, Ending Balance $ 16.46  
Performance-based RSUs [Member]    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Share equivalent, Beginning Balance 265,625  
Share equivalent, Granted 448,230 0
Share equivalent, Vested (159,375) (731,250)
Share equivalent, Ending Balance 554,480  
Weighted-average grant date fair value, Beginning Balance $ 7.76  
Weighted-average grant date fair value, Granted 7.05  
Weighted-average grant date fair value, Vested 7.76  
Weighted-average grant date fair value, Ending Balance $ 7.19