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Equity Incentive Awards - Summary of Stock Options Activity (Detail)
shares in Thousands
 6 Months Ended
Jun. 30, 2022
$ / shares
shares
Number of Options (in thousands)  
Beginning balance (in shares) | shares 13,288
Options granted (in shares) | shares 6,994
Options exercised (in shares) | shares (15)
Options forfeited (in shares) | shares (3,469)
Ending balance (in shares) | shares 16,798
Exercisable (in shares) | shares 4,739
Weighted- Average Grant- Date Fair Value  
Beginning balance (in USD per share) | $ / shares $ 9.34
Options granted (in USD per share) | $ / shares 1.33
Options exercised (in USD per share) | $ / shares 0.19
Options forfeited (in USD per share) | $ / shares 5.96
Ending balance (in USD per share) | $ / shares 6.71
Exercisable (in USD per share) | $ / shares $ 12.02