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Balance Sheet Detail - Accrued Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
External research and development expenses $ 1,946 $ 915
Amount of termination expenses 675  
Professional services 400 158
Payroll related 17 160
Other 48 189
Total 2,411 $ 1,422
Minimum    
Amount of loss on contract 0  
Maximum    
Amount of loss on contract $ 1,100