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Balance Sheet Components - Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Prepaid Expense And Other Assets [Abstract]    
Preclinical and clinical prepaid expenses $ 476 $ 531
Lease receivable   900
Unbilled receivable from CPRIT   1,604
Other 730 44
Total $ 1,206 $ 3,079