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Commitments and Contingencies - Summary of Future Minimum Annual Lease Payments (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Seattle Office Operating Lease [Member]  
Operating Leased Assets [Line Items]  
2018 $ 117
2019 144
2020 148
2021 25
Total 434
Bothell, Washington [Member]  
Operating Leased Assets [Line Items]  
2018 95
Total $ 95