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Significant Accounting Policies - Summary of Result of Adopting ASC 606 on Financial Statement - Consolidated Statement of Cash Flows (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Cash Flow Statements Captions [Line Items] |  |  |
Net loss | $ (146,653) | $ (101,980) | $ (55,660)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Deferred income taxes |  | 908 | (698)
Changes in operating assets and liabilities: |  |  |
Deferred revenue | $ 160,585 | (2,893) | 11,408
As Originally Reported Under ASC 605 [Member] | ASC 606 [Member] |  |  |
Condensed Cash Flow Statements Captions [Line Items] |  |  |
Net loss |  | (102,035) | (55,401)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Deferred income taxes |  | 774 | (564)
Changes in operating assets and liabilities: |  |  |
Deferred revenue |  | (2,704) | 11,015
Effect of Change [Member] | ASC 606 [Member] |  |  |
Condensed Cash Flow Statements Captions [Line Items] |  |  |
Net loss |  | 55 | (259)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities: |  |  |
Deferred income taxes |  | 134 | (134)
Changes in operating assets and liabilities: |  |  |
Deferred revenue |  | $ (189) | $ 393

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