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Condensed Consolidated Balance Sheet Components - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Accrued personnel expenses $ 1,902 $ 1,026
Accrued research and development expenses 2,082 1,193
Professional fees 100 706
Other 258 212
Total $ 4,342 $ 3,137 [1]
[1] The Condensed Consolidated Balance Sheet as of December 31, 2017 has been derived from the audited financial statements as of that date.