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Commitments and Contingencies - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 11, 2017 ft² | Aug. 01, 2015 ft² | Feb. 28, 2015 USD ($) ft² | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Mar. 01, 2018 USD ($) | Feb. 01, 2015 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Expiration of operating lease agreement |  |  |  | 2018-09 |  |  |  |
Consolidated rent and facilities expense |  |  |  | $ 600,000 | $ 900,000 | $ 2,800,000 |  |
Indemnification obligations |  |  |  | 0 |  |  |  |
Expenses related to indemnification issues |  |  |  | $ 0 |  |  |  |
Grosvenor International Limited [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Area of office space leased | ft² |  |  | 11,526 |  |  |  |  |
Expiration date of option to lease additional area of office space |  |  | Aug. 01, 2015 |  |  |  |  |
Lease expiration date |  |  | Apr. 30, 2018 | Apr. 30, 2018 |  |  |  |
Optional lease renewal |  |  | 3 years |  |  |  |  |
Monthly base rent commencement date |  |  | May 01, 2015 |  |  |  |  |
Lessee's share of property tax percentage. |  |  | 17.00% |  |  |  |  |
Construction allowance received for leasehold improvements |  |  |  |  |  |  |  | $ 100,000
Deposit amount under lease agreement |  |  |  |  |  |  |  | $ 200,000
Additional office space | ft² |  | 2,245 |  |  |  |  |  |
Grosvenor International Limited [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Monthly base rent |  |  | $ 18,000 |  |  |  |  |
Grosvenor International Limited [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Monthly base rent |  |  | $ 20,000 |  |  |  |  |
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 New Lease, with 520 Pike Street, Inc., or Pike, pursuant to which we will lease approximately 3,187 square feet located at Suite 2250 at 520 Pike Tower, Seattle, Washington, 98101, commencing on March 1, 2018, or such later date on which Pike delivers exclusive possession of the premises to us; and further provided, that if such delivery does not occur by May 1, 2018, we have the right to terminate the agreement upon provision of notice. The initial term of the New Lease will expire at the end of the month on the third anniversary of the New 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% |  |  |  |
Percentage of property if subleased could result in lease termination |  |  |  | 50.00% |  |  |  |
Vancouver, Canada [Member] |  |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |  |
Aggregate future minimum annual lease payments under the lease |  |  |  | $ 71,000,000 |  |  |  |

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