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Stockholders' Equity - Summary of Stock Option Activity under its Stock Plans (Detail)
6 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Shares Available for Grant, Outstanding Beginning Balance 2,192,545
Available for Grant, Shares authorized 2,000,000
Shares Available for Grant, Granted (1,105,278)
Shares Available for Grant, Exercised 92,459
Shares Available for Grant, Forfeited and expired 21,244
Shares Available for Grant, Outstanding Ending Balance 3,200,970
Shares, Options Outstanding, Beginning Balance 9,287,901
Shares, Options Outstanding, Granted 859,918
Shares, Options Outstanding, Exercised (2,399,296)
Shares Available for Grant, Forfeited and expired (21,244)
Shares Available for Grant, Outstanding Ending Balance 7,727,279
Shares, Vested and expected to vest, net of estimated forfeiture at June 30, 2020 7,418,771
Shares, Exercisable at June 30, 2020 4,412,289
Weighted Average Exercise Price, Options Outstanding, Beginning Balance | $ / shares $ 9.44
Weighted Average Exercise Price, Options Outstanding, Granted | $ / shares 48.67
Weighted Average Exercise Price, Options Outstanding, Exercised | $ / shares 10.00
Weighted Average Exercise Price, Options Outstanding, Forfeited and expired | $ / shares 13.78
Weighted Average Exercise Price, Options Outstanding, Ending Balance | $ / shares 13.62
Weighted Average Exercise Price, Vested and expected to vest, net of estimated forfeiture at June 30, 2020 | $ / shares 13.16
Weighted Average Exercise Price, Exercisable at June 30, 2020 | $ / shares $ 8.26
Options Outstanding, Weighted Average Remaining Contractual Term 7 years
Weighted Average Remaining Contractual Term, Vested and expected to vest, net of estimated forfeiture at June 30, 2020 6 years 11 months 1 day
Weighted Average Remaining Contractual Term, Exercisable at June30, 2020 5 years 8 months 8 days
Aggregate Intrinsic Value, Outstanding, Ending Balance | $ $ 339,650,595
Aggregate Intrinsic Value, Vested and expected to vest, net of estimated forfeiture at June 30, 2020 | $ 329,498,001
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2020 | $ $ 217,441,295