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Equity Incentive Awards - Summary of Stock Options Activity (Detail)
shares in Thousands
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Options Outstanding [Roll Forward]  
Beginning balance (in shares) | shares 10,432
Options granted (in shares) | shares 6,863
Options exercised (in shares) | shares (9)
Options forfeited (in shares) | shares (3,427)
Ending balance (in shares) | shares 13,859
Exercisable (in shares) | shares 5,724
Weighted- Average Grant- Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 11.65
Options granted (in USD per share) | $ / shares 8.02
Options exercised (in USD per share) | $ / shares 5.86
Options forfeited (in USD per share) | $ / shares 11.43
Ending balance (in USD per share) | $ / shares 9.91
Exercisable (in USD per share) | $ / shares $ 10.11