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Balance Sheet Components - Prepaid and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Prepaid and Other Current Assets    
Interest receivable $ 128 $ 329
Prepaid research and development manufacturing expenses 81 240
Prepaid facility expenses 160 157
Prepaid insurance 521 150
Other 413 486
Total of prepaid and other current assets $ 1,303 $ 1,362