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Stockholders' Equity - Summary of Stock Options Activity (Details) - $ / shares | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Class Of Stock [Line Items] |  |
Stock Options Outstanding, Beginning balance | 1,836,426 |
Stock Options, Exercised | (276,016) |
Stock Options, Forfeited | (625) |
Stock Options Outstanding, Ending balance | 1,559,785 | 1,836,426
Stock Options, Vested and exercisable | 1,128,065 |
Stock Options, Vested and expected to vest | 1,531,385 |
Price per share, Forfeited | $ 24.52 |
Outstanding, Weighted-average exercise price, Beginning balance | 30.77 |
Weighted-average exercise price, Exercised | 23.61 |
Weighted-average exercise price, Forfeited | 24.52 |
Outstanding, Weighted-average exercise price, Ending balance | 32.04 | $ 30.77
Weighted-average exercise price, Vested and exercisable | 27.97 |
Weighted-average exercise price, Vested and expected to vest | $ 31.85 |
Remaining weighted-average contractual term, Outstanding | 4 years 2 months 26 days | 4 years 6 months 29 days
Remaining weighted-average contractual term, Vested and exercisable | 4 years 1 month 13 days |
Remaining weighted-average contractual term, Vested and expected to vest | 4 years 2 months 23 days |
Outstanding, Per share average intrinsic value | $ 154.29 | $ 88.31
Per share average intrinsic value, Vested and exercisable | 158.36 |
Per share average intrinsic value, Vested and expected to vest | 154.48 |
Minimum |  |
Class Of Stock [Line Items] |  |
Outstanding, Price per share, Beginning balance | 0.60 |
Price per share, Exercised | 0.60 |
Outstanding, Price per share, Ending balance | 0.60 | 0.60
Price per share, Vested and exercisable | 0.60 |
Price per share, Vested and expected to vest | 0.60 |
Maximum |  |
Class Of Stock [Line Items] |  |
Outstanding, Price per share, Beginning balance | 83.30 |
Price per share, Exercised | 58.95 |
Outstanding, Price per share, Ending balance | 83.30 | $ 83.30
Price per share, Vested and exercisable | 83.30 |
Price per share, Vested and expected to vest | $ 83.30 |

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