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Commitments and Contingencies - Summary of Future Minimum Annual Lease Payments (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Seattle Office Operating Lease [Member]  
Operating Leased Assets [Line Items]  
2019 $ 108
2020 148
2021 25
Total 281
Vancouver, British Columbia [Member]  
Operating Leased Assets [Line Items]  
2019 47
2020 63
2021 65
2022 65
2023 5
Total $ 245