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Commitments and Contingencies - Summary of Future Minimum Annual Lease Payments (Detail)
$ in Thousands
Sep. 30, 2018
USD ($)
Seattle Office Operating Lease [Member]  
Operating Leased Assets [Line Items]  
2018 $ 35
2019 144
2020 148
2021 25
Total 352
Vancouver, Canada [Member]  
Operating Leased Assets [Line Items]  
2018 24
2019 8
Total $ 32