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Long-term debt - Hercules Loan Agreement (Details)
$ in Thousands
1 Months Ended 3 Months Ended 8 Months Ended 12 Months Ended
Aug. 08, 2019
USD ($)
item
Aug. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Debt Securities            
Interest expense         $ 734  
Unamortized debt discount     $ 199 $ 199 199  
Long Term Debt Due Charges     495      
Hercules Loan Agreement            
Debt Securities            
Maximum borrowing capacity $ 30,000          
Borrowed amount 10,000          
Facility charge 225          
Additional closing and legal fees 130          
Unused borrowing capacity available under the facility $ 20,000          
Number of separate advances available to be borrowed under the unused facility | item 2          
Interest rate   8.75%        
Term (in years)   4 years        
Percentage of prepayment charge payable within the first twelve months   3.00%        
Percentage of prepayment charge payable after twelve months but prior to twenty four months   2.00%        
Percentage of prepayment charge payable anytime thereafter   1.00%        
Percentage of charge Payable on aggregate debt amount   4.95%        
Upfront fees, including closing costs and legal fees   $ 355        
Interest expense         734  
Non-cash interest expense related to accretion of the debt discount         60 $ 96
Unamortized debt discount     199 $ 199 199  
Interest Rate       10.10%    
Principal payments due or paid     $ 0 $ 0 $ 0  
Hercules loan agreement, second advance            
Debt Securities            
Maximum borrowing capacity $ 10,000          
Hercules loan agreement, third advance            
Debt Securities            
Maximum borrowing capacity $ 10,000          
Prime Rate | Hercules Loan Agreement            
Debt Securities            
Variable interest rate   2.75%