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Oxford Term Loans - Narrative (Details)
Mar. 15, 2019
USD ($)
advance
Dec. 31, 2019
Term Loan Facility    
Debt Instrument [Line Items]    
Interest rate on debt   11.60%
Percentage of final payment of full principal amount 5.50%  
Prepayment fee percentage, next twelve months 3.00%  
Prepayment fee percentage, year two 2.00%  
Prepayment fee percentage, thereafter 1.00%  
Debt discount $ 1,094,000  
Debt issuance costs $ 2,205,000  
Term Loan Facility | Applicable Rate    
Debt Instrument [Line Items]    
Default interest rate 5.00%  
Secured Debt    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 100,000  
Number of advances | advance 2  
Interest rate on debt 9.50%  
Period of interest only payments 36 months  
Amortization period 23 months  
Additional period of agreement of interest payment 12 months  
Aggregate period 48 months  
Additional amortization period 11 months  
Secured Debt | LIBOR    
Debt Instrument [Line Items]    
Basis spread on variable rate 7.00%  
Secured Debt | First tranche    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 75,000  
Secured Debt | Second tranche    
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 25,000  
Period to achieve net sales milestone before second drawn 6 months  
Final payment amortized into interest expense over the life of the term loan $ 4,125,000