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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Apr. 30, 2018 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Payments of stock issuance costs |  |  |  |  |  |  |  |  | $ 110 |
Proceeds from issuance of common stock | $ 194,400 | $ 168,700 |  |  |  |  |  |  |  | $ 363,128
Shares of common stock issued pursuant to exercise of stock options |  |  |  |  |  |  |  |  | 1,793,000 |
Proceeds from stock option exercises |  |  |  |  |  |  |  |  | $ 20,239 | $ 15,771
Total unrecognized compensation cost related to non-vested, stock-based payment awards |  |  | $ 80,200 |  |  |  |  |  | $ 80,200 |
Total unrecognized compensation cost, expect to recognize over weighted average period |  |  |  |  |  |  |  |  | 2 years 7 months 6 days |
Common Stock |  |  |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares issued | 5,100,000 | 6,900,000 |  |  |  |  | 11,963,000 |  |  |
Share price | $ 39.50 | $ 26.00 |  |  |  |  | $ 39.50 |  |  |
Payments of stock issuance costs | $ 5,600 | $ 10,700 |  |  |  |  |  |  |  |
Shares of common stock issued pursuant to exercise of stock options |  |  | 251,000 | 810,000 | 732,000 | 393,000 | 504,000 | 435,000 |  |

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