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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Nov. 30, 2017 USD ($) ft² Option | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Commitments And Contingencies [Line Items] |  |  |
Restricted cash |  | $ 79,941 | $ 3,500
Brisbane Build-to-Suit Lease [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Property leased | ft² | 87,700 |  |
Lease expiration date |  | May 31, 2029 |
Operating lease expiration period | 10 years |  |
Number of lease term extension options | Option | 2 |  |
Restricted cash | $ 3,500 | $ 3,500 |
Costs capitalized |  | $ 39,500 |
Brisbane Build-to-Suit Lease [Member] | Building [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Costs capitalized | $ 20,900 |  |
Brisbane Build-to-Suit Lease [Member] | Maximum [Member] |  |  |
Commitments And Contingencies [Line Items] |  |  |
Lease agreement, extendable lease term | 10 years |  |

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