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DEBT - Additional Information (Details)
12 Months Ended
Dec. 21, 2017
USD ($)
installment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]      
Amortization of deferred issuance costs   $ 885,000 $ 886,000
Oxford Loan      
Debt Instrument [Line Items]      
Face amount borrowed $ 35,000,000.0    
Number of periodic payments | installment 35    
Interest rate at end of period   11.44%  
Final payment, percent of principal 8.70%    
Early repayment fee, percentage of prepaid amount, period one 3.00%    
Early repayment fee, percentage of prepaid amount, period two 2.00%    
Early repayment fee, percentage of prepaid amount, period three 1.00%    
Payment of debt issuance costs $ 100,000    
Final facility charge payment $ 3,000,000    
Amortization of deferred issuance costs   $ 900,000 $ 900,000
Oxford Loan | Floating per Annum Rate      
Debt Instrument [Line Items]      
Basis spread on variable rate - plus (minus) 7.25%    
Oxford Loan | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Basis spread on variable rate - plus (minus) 1.25%    
Hercules Loan      
Debt Instrument [Line Items]      
Payment on debt $ 32,900,000