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Significant Accounting Policies - Summary of Result of Adopting ASC 606 on Financial Statement - Condensed Consolidated Statement of Cash Flows (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Condensed Cash Flow Statements Captions [Line Items]    
Net loss $ (108,766) $ (71,187)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Deferred income taxes   904
Changes in operating assets and liabilities:    
Deferred revenue 164,207 (2,795)
Net cash provided by (used in) operating activities 9,958 (60,917)
Cash, cash equivalents and restricted cash, beginning of period 146,113 153,894
Cash, cash equivalents and restricted cash, end of period $ 214,109 172,072
As Originally Reported Under ASC 605 [Member] | ASC 606 [Member]    
Condensed Cash Flow Statements Captions [Line Items]    
Net loss   (71,824)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Deferred income taxes   774
Changes in operating assets and liabilities:    
Deferred revenue   (2,028)
Net cash provided by (used in) operating activities   (60,917)
Cash, cash equivalents and restricted cash, beginning of period   153,894
Cash, cash equivalents and restricted cash, end of period   172,072
Effect of Change [Member] | ASC 606 [Member]    
Condensed Cash Flow Statements Captions [Line Items]    
Net loss   637
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:    
Deferred income taxes   130
Changes in operating assets and liabilities:    
Deferred revenue   $ (767)