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Summary of Significant Accounting Policies - Schedule of Adoption of New Revenue Standards Changes in Accumulated Deficit (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Accumulated deficit | $ (715,827) | $ (630,657) | $ (509,782) | $ (451,714)
As Previously Reported [Member] | ASU 2014-09 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Accumulated deficit |  | (595,945) | (469,742) | (408,062)
New Revenue Standards Adjustment [Member] | ASU 2014-09 [Member] |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |
Accumulated deficit |  | $ (34,712) | $ (40,040) | $ (43,652)

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