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Stockholders' Equity - Summary of Stock Option Activity under its Stock Plans (Detail)
9 Months Ended
Sep. 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 (1,179,578)
Shares Available for Grant, Exercised 92,459
Shares Available for Grant, Forfeited and expired 122,135
Shares Available for Grant, Outstanding Ending Balance 3,227,561
Shares, Options Outstanding, Beginning Balance 9,287,901
Shares, Options Outstanding, Granted 934,218
Shares, Options Outstanding, Exercised (2,704,469)
Shares Available for Grant, Forfeited and expired (110,468)
Shares Available for Grant, Outstanding Ending Balance 7,407,182
Shares, Vested and expected to vest, net of estimated forfeiture at June 30, 2020 7,136,579
Shares, Exercisable at June 30, 2020 4,434,932
Weighted Average Exercise Price, Options Outstanding, Beginning Balance | $ / shares $ 9.44
Weighted Average Exercise Price, Options Outstanding, Granted | $ / shares 49.08
Weighted Average Exercise Price, Options Outstanding, Exercised | $ / shares 9.61
Weighted Average Exercise Price, Options Outstanding, Forfeited and expired | $ / shares 23.90
Weighted Average Exercise Price, Options Outstanding, Ending Balance | $ / shares 14.16
Weighted Average Exercise Price, Vested and expected to vest, net of estimated forfeiture at June 30, 2020 | $ / shares 13.70
Weighted Average Exercise Price, Exercisable at June 30, 2020 | $ / shares $ 8.46
Options Outstanding, Weighted Average Remaining Contractual Term 6 years 9 months
Weighted Average Remaining Contractual Term, Vested and expected to vest, net of estimated forfeiture at June 30, 2020 6 years 8 months 1 day
Weighted Average Remaining Contractual Term, Exercisable at June30, 2020 5 years 5 months 26 days
Aggregate Intrinsic Value, Outstanding, Ending Balance | $ $ 301,653,026
Aggregate Intrinsic Value, Vested and expected to vest, net of estimated forfeiture at June 30, 2020 | $ 293,912,662
Weighted Average Remaining Contractual Term, Exercisable at June 30, 2020 | $ $ 205,536,129