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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)

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