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Equity Incentive Awards - Summary of Stock Options Activity (Detail)
shares in Thousands
 3 Months Ended
Mar. 31, 2022
$ / shares
shares
Number of Options (in thousands)  
Beginning balance (in shares) | shares 13,288
Options granted (in shares) | shares 5,735
Options exercised (in shares) | shares (15)
Options forfeited (in shares) | shares (2,837)
Ending balance (in shares) | shares 16,171
Exercisable (in shares) | shares 3,921
Weighted- Average Grant- Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 9.34
Options granted (in USD per share) | $ / shares 1.40
Options exercised (in USD per share) | $ / shares 0.19
Options forfeited (in USD per share) | $ / shares 6.60
Ending balance (in USD per share) | $ / shares 7.01
Exercisable (in USD per share) | $ / shares $ 12.95