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Balance Sheets Components - Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Prepaid research and development expenses $ 4,124 $ 2,356
Accrued interest on investments 2,337 3,108
Other prepaid and current assets 1,938 758
Prepaid insurance 114 2,376
Total prepaid expenses and other current assets $ 8,513 $ 8,598 [1]
[1] The balance sheet as of December 31, 2018 is derived from the audited financial statements as of that date.