Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands |
1 Months Ended | 3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|---|
Oct. 20, 2016 |
Oct. 31, 2016 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
|
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] | ||||||
Net loss | $ (65,781) | $ (60,417) | $ (203,350) | $ (177,565) | ||
Net cash used in operating activities | $ (100,729) | (121,437) | ||||
Net proceeds from issuance of common stock | $ 205,133 | |||||
Subsequent Event | Underwritten Public Offering | ||||||
Organization Consolidation And Presentation Of Financial Statements Disclosure [Line Items] | ||||||
Net proceeds from issuance of common stock | $ 161,800 | $ 161,800 |