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Notes payable (Details)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 02, 2020
USD ($)
Apr. 15, 2019
installment
Apr. 14, 2014
Aug. 31, 2018
USD ($)
Mar. 31, 2020
USD ($)
Oct. 31, 2018
USD ($)
Long Term Debt            
End Of Term Fee         $ 50,000  
Loan principal payment installment | installment   5        
Loan agreement            
Long Term Debt            
Additional amounts available to borrow         $ 0  
Loan agreement | Minimum            
Long Term Debt            
Interest rate (as a percent)     8.00%      
Amendment 5 to loan agreement            
Long Term Debt            
Term fee $ 100     $ 100    
Cost incurred upon execution       $ 50    
Amendment 6 to loan agreement            
Long Term Debt            
Certificate of deposit associated with the lease           $ 1,000
Prime rate | Loan agreement            
Long Term Debt            
Margin on variable interest rate (as a percent)     (5.25%)