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Commitments and Contingencies - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 11, 2017 ft² | Jul. 31, 2018 | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Mar. 01, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |
Expiration of operating lease agreement |  |  |  |  | 2019-01 |  |
Operating lease agreement extended period month and year |  | 2019-01 |  |  |  |  |
Consolidated rent and facilities expense |  |  | $ 100,000 | $ 100,000 | $ 200,000 | $ 100,000 |
Indemnification obligations |  |  | $ 0 |  | 0 |  |
Expenses related to indemnification issues |  |  |  |  | $ 0 |  |
Pike [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Area of office space leased | ft² | 3,187 |  |  |  |  |  |
Lease agreement |  |  |  |  | On December 11, 2017, we entered into a lease, or the Seattle Lease, with 520 Pike Street, Inc., or Pike, pursuant to which we leased approximately 3,187 square feet located at Suite 2250 at 520 Pike Tower, Seattle, Washington, 98101, which commenced on March 1, 2018. The initial term of the Seattle Lease will expire at the end of the month on the third anniversary of the Seattle Lease. |  |
Monthly base rent |  |  |  |  |  |  | $ 11,685,000
Monthly base rent, maximum annual increase |  |  |  |  |  |  | 12,397,000
Lease, security deposit, annual payment |  |  |  |  |  |  | 37,192,000
Lease, security deposit payment, annual decrease |  |  |  |  |  |  | $ 12,397,000
Percentage of profit attributable to lessor |  |  | 50.00% |  | 50.00% |  |
Percentage of property if subleased could result in lease termination |  |  | 50.00% |  | 50.00% |  |

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