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Commitments and Contingencies - Additional Information (Detail) - Brisbane Build-to-Suit Lease [Member] $ in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2017 USD ($) ft² Option | Jun. 30, 2018 USD ($)
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 | $ 3.5 |
Costs capitalized |  | $ 27.0
Building [Member] |  |
Commitments And Contingencies [Line Items] |  |
Costs capitalized | $ 20.9 |
Maximum [Member] |  |
Commitments And Contingencies [Line Items] |  |
Lease agreement, extendable lease term | 10 years |

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