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Condensed Consolidated Balance Sheet Components - Summary of Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Accrued personnel expenses $ 2,301 $ 2,833
Accrued research and development expenses 12,910 2,816
Professional fees 268 211
Other 73 163
Total $ 15,552 $ 6,023 [1]
[1] The Condensed Consolidated Balance Sheet as of December 31, 2018 has been derived from the audited financial statements as of that date.