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Commitments and Contingencies - Summary of Future Minimum Annual Lease Payments (Detail)
$ in Thousands
Dec. 31, 2019
USD ($)
Bothell Office Operating Lease [Member]  
Operating Leased Assets [Line Items]  
2020 $ 148
2021 25
Total 173
Vancouver, British Columbia [Member]  
Operating Leased Assets [Line Items]  
2020 65
2021 66
2022 67
2023 6
Total $ 204