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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue, current portion	$ 51,094		$ 28,345
Deferred revenue, noncurrent portion	123,917		29,244
Accumulated deficit	(544,032)		$ (495,479)
Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue, current portion		$ 29,626
Deferred revenue, noncurrent portion		26,846
Accumulated deficit		(494,362)
Adjustments [Member] | Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue, current portion	12,741	1,281
Deferred revenue, noncurrent portion	(3,130)	(2,398)
Accumulated deficit	(9,611)	1,117
Balances without adoption of Topic 606 [Member] | Topic 606 [Member]
Revenue Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue, current portion	63,835	28,345
Deferred revenue, noncurrent portion	120,787	29,244
Accumulated deficit	$ (553,643)	$ (495,479)

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