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Stockholders' Equity - Summary of Stock Option Activity (Detail)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Number of Shares  
Options outstanding at beginning of period (in shares) | shares 9,829,287
Options granted (in shares) | shares 4,563,425
Options exercised (in shares) | shares (1,162,268)
Options canceled (in shares) | shares (1,751,746)
Options outstanding at end of period (in shares) | shares 11,478,698
Options vested and expected to vest at end of period (in shares) | shares 11,478,698
Options exercisable at end of period (in shares) | shares 5,127,517
Weighted- Average Exercise per Share Price  
Options outstanding at beginning of period (in dollars per share) | $ / shares $ 10.71
Options granted (in dollars per share) | $ / shares 8.09
Options exercised (in dollars per share) | $ / shares 8.02
Options canceled (in dollars per share) | $ / shares 10.19
Options outstanding at end of period (in dollars per share) | $ / shares 10.02
Options vested and expected to vest at end of period (in dollars per share) | $ / shares 10.02
Options exercisable at end of period (in dollars per share) | $ / shares $ 10.71
Weighted-Average Remaining Contractual Term  
Options outstanding at end of period (in years) 7 years 9 months 18 days
Options vested and expected to vest at end of period (in years) 7 years 9 months 18 days
Options exercisable at end of period (in years) 6 years 5 months 23 days
Aggregate Intrinsic Value  
Options outstanding at end of period | $ $ 69,616
Options vested and expected to vest at end of period | $ 69,616
Options exercisable at end of period | $ $ 29,025