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Commitments and Contingencies - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Aug. 01, 2015 ft² | Feb. 28, 2015 USD ($) ft² | Sep. 30, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Feb. 01, 2015 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |
Expiration of operating lease agreement |  |  |  | 2018-09 |  |
Consolidated rent and operating expense relating to Vancouver and Bothell |  |  | $ 100,000 | $ 100,000 | $ 0 |
Indemnification obligations |  |  | $ 0 | 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 |  |  |  |
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 |  |  |  |

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