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Stockholders' Equity - Summary of Stock Options Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class Of Stock [Line Items] |  |  |  |
Stock Options Outstanding, Beginning balance | 1,127,336 | 1,836,426 | 2,355,527 |
Stock Options, Granted |  |  | 64,498 |
Stock Options, Exercised | (109,291) | (708,319) | (520,393) |
Stock Options, Forfeited | (37,161) | (771) | (63,173) |
Stock Options, Expired |  |  | (33) |
Stock Options Outstanding, Ending balance | 980,884 | 1,127,336 | 1,836,426 | 2,355,527
Stock Options, Vested and exercisable | 929,825 | 851,039 | 1,176,504 |
Stock Options, Vested and expected to vest | 977,589 | 1,109,280 | 1,792,871 |
Price per share, Granted |  |  | $ 83.30 |
Price per share, Expired |  |  | 8.70 |
Outstanding, Weighted-average exercise price, Beginning balance | $ 34.89 | $ 30.77 | 28.22 |
Weighted-average exercise price, Granted |  |  | 83.30 |
Weighted-average exercise price, Exercised | 28.45 | 24.22 | 24.16 |
Weighted-average exercise price, Forfeited | 44.58 | 28.24 | 43.74 |
Weighted-average exercise price, Expired |  |  | 8.70 |
Outstanding, Weighted-average exercise price, Ending balance | 35.24 | 34.89 | 30.77 | $ 28.22
Weighted-average exercise price, Vested and exercisable | 34.73 | 32.12 | 24.33 |
Weighted-average exercise price, Vested and expected to vest | $ 35.21 | $ 34.75 | $ 30.50 |
Remaining weighted-average contractual term, Outstanding | 2 years 10 months 2 days | 3 years 10 months 2 days | 4 years 6 months 29 days | 5 years 5 months 1 day
Remaining weighted-average contractual term, Vested and exercisable | 2 years 9 months 21 days | 3 years 9 months | 4 years 4 months 20 days |
Remaining weighted-average contractual term, Vested and expected to vest | 2 years 10 months 2 days | 3 years 10 months 2 days | 4 years 6 months 29 days |
Outstanding, Per share average intrinsic value | $ 34.07 | $ 89.28 | $ 88.31 | $ 38.95
Per share average intrinsic value, Vested and exercisable | 34.64 | 92.05 | 94.75 |
Per share average intrinsic value, Vested and expected to vest | 34.11 | 89.42 | 88.58 |
Minimum |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Outstanding, Price per share, Beginning balance | 0.75 | 0.60 | 0.60 |
Price per share, Exercised | 0.75 | 0.60 | 0.60 |
Price per share, Forfeited | 38.54 | 24.52 | 24.52 |
Outstanding, Price per share, Ending balance | 0.75 | 0.75 | 0.60 | 0.60
Price per share, Vested and exercisable | 0.75 | 0.75 | 0.60 |
Price per share, Vested and expected to vest | 0.75 | 0.75 | 0.60 |
Maximum |  |  |  |
Class Of Stock [Line Items] |  |  |  |
Outstanding, Price per share, Beginning balance | 83.30 | 83.30 | 58.95 |
Price per share, Exercised | 58.95 | 58.95 | 58.95 |
Price per share, Forfeited | 58.95 | 44.19 | 58.95 |
Outstanding, Price per share, Ending balance | 83.30 | 83.30 | 83.30 | $ 58.95
Price per share, Vested and exercisable | 83.30 | 83.30 | 83.30 |
Price per share, Vested and expected to vest | $ 83.30 | $ 83.30 | $ 83.30 |

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