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Significant Accounting Policies - Summary of Result of Adopting ASC 606 on Financial Statement - Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Condensed Balance Sheet Statements Captions [Line Items] |  |
Current portion of deferred revenue | $ 100,945 | $ 1,275
Deferred revenue, net of current portion | 68,156 | 7,241
Accumulated deficit | $ (339,721) | (192,716)
As Originally Reported Under ASC 605 [Member] | ASC 606 [Member] |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |
Current portion of deferred revenue |  | 2,705
Deferred revenue, net of current portion |  | 5,607
Accumulated deficit |  | (192,512)
Effect of Change [Member] | ASC 606 [Member] |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |
Current portion of deferred revenue |  | (1,430)
Deferred revenue, net of current portion |  | 1,634
Accumulated deficit |  | $ (204)

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