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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 01, 2018
Mar. 31, 2019
Dec. 31, 2019
CRO      
Commitments and Contingencies      
Expected term 5 years    
CRO Initial clinical trials      
Commitments and Contingencies      
Expected term     2 years
Expected cost     $ 10,000
Cost incurred     1,809
CRO Second clinical trials      
Commitments and Contingencies      
Expected term   3 years  
Expected cost   $ 8,000  
Cost incurred     1,353
Reimbursed cost (as a percent)   50.00%  
Reimbursement receivable     $ 82