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Borrowings - MidCap Credit Facility - Additional Information (Detail)
1 Months Ended 12 Months Ended
Aug. 06, 2019
USD ($)
Installment
$ / shares
shares
Dec. 31, 2019
USD ($)
Aug. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]        
Unamortized debt issuance costs   $ 874,000   $ 874,000
Unamortized debt discount   539,000   539,000
MidCap Credit Facility        
Debt Instrument [Line Items]        
Principal amount     $ 75,000,000  
Advance of borrowing   25,000,000    
Amount available under credit facility     35,000,000  
Unamortized debt issuance costs   800,000   800,000
Unamortized debt discount   $ 300,000   $ 300,000
Credit facility, origination fee $ 400,000      
Interest on loans increased, percentage 2.00%      
Term loan advance percentage of amount drawdown 3.25%      
Warrants to purchase of common stock | shares 1,171,614      
Exercise price of warrants | $ / shares $ 1.11      
MidCap Credit Facility | Between First Anniversary and Prior to Second Anniversary of Closing Date        
Debt Instrument [Line Items]        
Early termination fees, percentage 2.00%      
MidCap Credit Facility | Prior to First Anniversary of Closing Date        
Debt Instrument [Line Items]        
Early termination fees, percentage 3.00%      
MidCap Credit Facility | After Second Anniversary and Prior to Third Anniversary of Closing Date        
Debt Instrument [Line Items]        
Early termination fees, percentage 1.00%      
MidCap Credit Facility | LIBOR        
Debt Instrument [Line Items]        
Interest rate (LIBOR)       6.75%
Interest rate floor       2.00%
MidCap Credit Facility | Minimum        
Debt Instrument [Line Items]        
Debt Instrument Exit Fee Percentage   6.00%    
MidCap Credit Facility | Maximum        
Debt Instrument [Line Items]        
Debt Instrument Exit Fee Percentage   7.00%    
Tranche 1 | MidCap Credit Facility        
Debt Instrument [Line Items]        
Advance of borrowing $ 40,000,000      
Tranche 1 | MidCap Credit Facility | LIBOR        
Debt Instrument [Line Items]        
Interest rate (LIBOR) 6.75%      
Interest rate floor 2.00%      
Tranche 2 | MidCap Credit Facility        
Debt Instrument [Line Items]        
Amount available under credit facility     10,000,000  
Debt instrument, minimum target net revenue     30,000,000  
Minimum cash covenant $ 15,000,000 $ 15,000,000   $ 15,000,000
Tranche 2 | MidCap Credit Facility | LIBOR        
Debt Instrument [Line Items]        
Interest rate (LIBOR) 6.75%      
Interest rate floor 2.00%      
Tranche 3 | MidCap Credit Facility        
Debt Instrument [Line Items]        
Amount available under credit facility     $ 25,000,000  
Debt instrument payment term description       principal on each term loan advance under Tranche 3 is payable beginning on the later of (i) September 1, 2021, and (ii) the first day of the first full calendar month immediately following such term loan advance, in an amount equal to the outstanding term loan advance in respect of Tranche 3 divided by the number of full calendar months remaining before August 1, 2024.
Minimum cash covenant   $ 20,000,000   $ 20,000,000
Tranche 3 | MidCap Credit Facility | LIBOR        
Debt Instrument [Line Items]        
Interest rate (LIBOR) 6.75%      
Interest rate floor 2.00%      
Tranche 1 and Tranche 2 | MidCap Credit Facility        
Debt Instrument [Line Items]        
Debt payable number of equal monthly installments | Installment 36      
Debt instrument payment term description       principal on each term loan advance under Tranche 3 is payable beginning on the later of (i) September 1, 2021, and (ii) the first day of the first full calendar month immediately following such term loan advance, in an amount equal to the outstanding term loan advance in respect of Tranche 3 divided by the number of full calendar months remaining before August 1, 2024.
Tranche 2 and 3 [Member] | MidCap Credit Facility        
Debt Instrument [Line Items]        
Minimum cash covenant $ 20,000,000