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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Condensed Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Organization And Summary Of Significant Accounting Policies [Line Items] |  |
Net loss | $ (49,670) | $ (41,477)
Changes in deferred revenue | 118,540 | $ 56,078
Adjustments [Member] | Topic 606 [Member] |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |
Net loss | (8,495) |
Changes in deferred revenue | 8,495 |
Balances without adoption of Topic 606 [Member] | Topic 606 [Member] |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |
Net loss | (58,165) |
Changes in deferred revenue | $ 127,035 |

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