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Commitments and Contingencies - Summary of Future Minimum Annual Lease Payments (Detail)
$ in Thousands
Sep. 30, 2017
USD ($)
Vancouver, Canada [Member]  
Operating Leased Assets [Line Items]  
2017 $ 25
2018 73
Total 98
Bothell, Washington [Member]  
Operating Leased Assets [Line Items]  
2017 71
2018 96
Total $ 167