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Commitments and Contingencies - Additional Information (Detail) |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 19, 2018 USD ($) ft² | Dec. 11, 2017 ft² | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Mar. 01, 2018 USD ($)
Other Commitments [Line Items] |  |  |  |  |  |  |
Indemnification obligations |  |  |  | $ 0 |  | $ 0 |
Expenses related to indemnification issues |  |  |  |  | $ 0 |  |
Seattle Lease Arrangement [Member] |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Consolidated lease rent and facilities expense |  |  | $ 100,000 | 100,000 | $ 100,000 | 100,000 |
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. |  |
Monthly base rent |  |  |  |  |  |  | $ 11,685
Monthly base rent, maximum annual increase |  |  |  |  |  |  | 12,397
Lease, security deposit, annual payment |  |  |  |  |  |  | 37,192
Lease, security deposit payment, annual decrease |  |  |  |  |  |  | 12,397
Lease, security deposit payment, annual decrease after second anniversary |  |  |  |  |  |  | 12,397
Lease, security deposit payment, annual decrease on termination of lease |  |  |  |  |  |  | $ 12,397
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 | $ 100,000 | $ 100,000 |
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 |  |  |  |  |  |
Operating lease, revised monthly base rent expenses | 5,400 |  |  |  |  |  |
Construction allowance | 14,200 |  |  |  |  |  |
Security deposit | $ 18,600 |  |  |  |  |  |

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