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Significant Accounting Policies - Summary of Result of Adopting ASC 606 on Financial Statement - Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements Captions [Line Items]      
Net loss $ (146,653) $ (101,980) $ (55,660)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Deferred income taxes   908 (698)
Changes in operating assets and liabilities:      
Deferred revenue $ 160,585 (2,893) 11,408
As Originally Reported Under ASC 605 [Member] | ASC 606 [Member]      
Condensed Cash Flow Statements Captions [Line Items]      
Net loss   (102,035) (55,401)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Deferred income taxes   774 (564)
Changes in operating assets and liabilities:      
Deferred revenue   (2,704) 11,015
Effect of Change [Member] | ASC 606 [Member]      
Condensed Cash Flow Statements Captions [Line Items]      
Net loss   55 (259)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:      
Deferred income taxes   134 (134)
Changes in operating assets and liabilities:      
Deferred revenue   $ (189) $ 393