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Organization, Basis of Presentation and Summary of Significant Accounting Policies - Condensed Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Organization And Summary Of Significant Accounting Policies [Line Items] |  |
Net loss | $ (36,827) | $ (29,123)
Changes in deferred revenue | 138,474 | $ 64,346
Adjustments [Member] | Topic 606 [Member] |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |
Net loss | (4,047) |
Changes in deferred revenue | 4,047 |
Balances without adoption of Topic 606 [Member] | Topic 606 [Member] |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |
Net loss | (40,874) |
Changes in deferred revenue | $ 142,521 |

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