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Debt - Squadron Credit Agreement (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 27, 2019
Nov. 06, 2018
Mar. 31, 2019
Sep. 30, 2019
Squadron Credit Agreement        
Line of Credit Facility [Line Items]        
Current interest rate   10.10%    
Debt instrument, aggregate principal to be paid on installments   $ 10,000,000    
Debt instrument, frequency of periodic payment 29 equal monthly installments 29 equal monthly installments    
Debt instrument, maturity date Nov. 30, 2023 Nov. 30, 2023    
New debt issuance costs     $ 300,000  
Additional warrants for future       0
Debt carrying amount, net of issuance cost       $ 38,200,000
Debt issuance costs       $ 6,800,000
Debt issuance cost, amortization period       5 years
Squadron Credit Agreement | Expanded Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity $ 30,000,000      
Squadron Credit Agreement | Common Stock        
Line of Credit Facility [Line Items]        
Number of warrants issued (in shares) 4,838,710 845,000    
Exercise price of warrants $ 2.17 $ 3.15    
Warrants term 7 years 7 years    
Squadron Credit Agreement | Minimum        
Line of Credit Facility [Line Items]        
Current interest rate   10.00%    
Squadron Credit Agreement | Maximum        
Line of Credit Facility [Line Items]        
Current interest rate   13.00%    
Term Loan | Squadron Credit Agreement        
Line of Credit Facility [Line Items]        
Secured debt agreement   $ 35,000,000   $ 20,000,000
Proceeds from secured term loan   $ 34,100,000    
Debt instrument, maturity date       Dec. 31, 2020
Debt outstanding amount       $ 45,000,000
Line of Credit | Squadron Credit Agreement        
Line of Credit Facility [Line Items]        
Line of credit       $ 10,000,000
Floor on interest rate 10.00%      
Ceiling on interest rate 13.00%      
Line of Credit | Squadron Credit Agreement | LIBOR        
Line of Credit Facility [Line Items]        
Line of credit, expiration period   5 years    
Interest rate description   LIBOR plus 8%    
Basis spread   8.00%    
Line of Credit | Globus facility agreement        
Line of Credit Facility [Line Items]        
Line of credit   $ 29,200,000