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Commitments and Contingencies - Additional Information (Detail) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 19, 2018 USD ($) ft² | Dec. 11, 2017 ft² | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Mar. 01, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |
Indemnification obligations |  |  | $ 0 |  | $ 0 |  |
Expenses related to indemnification issues |  |  |  |  | $ 0 |  |
Vancouver Office Operating Lease [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Expiration of operating lease agreement |  |  |  |  | 2019-01 |  |
Consolidated lease rent and facilities expense |  |  | 100,000 | $ 100,000 | $ 200,000 | $ 200,000 |
Vancouver Office Operating Lease [Member] | Vancouver, British Columbia [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Lease agreement commencement date | Feb. 01, 2019 |  |  |  |  |  |
Area of office space leased | ft² | 2,367 |  |  |  |  |  |
Initial term of lease expiration date | Jan. 31, 2023 |  |  |  |  |  |
Operating lease, term of contract | 4 years |  |  |  |  |  |
Operating lease, option to extend, description |  |  |  |  | The initial term of the Vancouver Lease will expire on January 31, 2023, with an option to extend the term for one further four-year period |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  |  |  |  | true |  |
Operating lease, initial monthly base rent expenses | $ 5,200,000 |  |  |  |  |  |
Operating lease, revised monthly base rent expenses | 5,400,000 |  |  |  |  |  |
Construction allowance | 14,200,000 |  |  |  |  |  |
Security deposit | $ 18,600,000 |  |  |  |  |  |
Seattle Office Operating Lease [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Consolidated lease rent and facilities expense |  |  | $ 100,000 | $ 100,000 | $ 200,000 | $ 200,000 |
Seattle Office Operating Lease [Member] | 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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