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Equity Incentive Plans - Summary of Company's Stock Option Activity (Details)
 6 Months Ended
Jun. 30, 2020
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding stock options, Beginning balance (in shares) | shares 15,918,243
Outstanding stock options - Granted (in shares) | shares 1,646,898
Outstanding stock options - Exercised (in shares) | shares (3,858,369)
Outstanding stock options - Cancelled (in shares) | shares (199,542)
Outstanding stock options, Ending balance (in shares) | shares 13,507,230
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Weighted-average exercise price - Beginning balance (in dollars per share) | $ / shares $ 6.82
Weighted-average exercise price - Granted (in dollars per share) | $ / shares 76.98
Weighted-average exercise price - Exercised (in dollars per share) | $ / shares 1.91
Weighted-average exercise price - Cancelled (in dollars per share) | $ / shares 10.32
Weighted-average exercise price - Ending balance (in dollars per share) | $ / shares $ 16.72