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Significant Accounting Policies - Summary of Result of Adopting ASC 606 on Financial Statement - Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Condensed Balance Sheet Statements Captions [Line Items]
Current portion of deferred revenue	$ 103,229	$ 1,275
Deferred revenue, net of current portion	69,494	7,241
Accumulated deficit	$ (301,834)	(192,716)
As Originally Reported Under ASC 605 [Member] | ASC 606 [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current portion of deferred revenue		2,705
Deferred revenue, net of current portion		5,607
Accumulated deficit		(192,512)
Effect of Change [Member] | ASC 606 [Member]
Condensed Balance Sheet Statements Captions [Line Items]
Current portion of deferred revenue		(1,430)
Deferred revenue, net of current portion		1,634
Accumulated deficit		$ (204)

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