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Commitments and Contingencies - Additional Information (Detail) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 19, 2018 USD ($) ft² | Dec. 11, 2017 ft² | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Mar. 01, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |
Consolidated rent and facilities expense |  |  | $ 100,000 | $ 200,000 | $ 200,000 |
Indemnification obligations |  |  | 0 |  |  |
Expenses related to indemnification issues |  |  | $ 0 |  |  |
Vancouver Office Operating Lease [Member] |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Expiration of operating lease agreement |  |  | 2019-01 |  |  |
Vancouver Office Operating Lease [Member] | Vancouver, British Columbia [Member] |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |
Lease agreement commencement date | Feb. 01, 2019 |  |  |  |  |
Annual rent expense | $ 100,000 |  |  |  |  |
Area of office space leased | ft² | 2,367 |  |  |  |  |
Operating lease, term of contract | 4 years |  |  |  |  |
Seattle Lease Arrangement [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 Seattle Lease expired on March 1, 2021 and was not renewed. |  |  |
Lease expired date |  | Mar. 01, 2021 |  |  |  |
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 first anniversary |  |  |  |  |  | 12,397,000
Lease, security deposit payment two anniversary |  |  |  |  |  | 12,397,000
Lease, security deposit payment remaining amount |  |  |  |  |  | $ 12,397,000

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