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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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