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Debt - Squadron Credit Agreement (Details) - USD ($)
3 Months Ended
Mar. 27, 2019
Nov. 06, 2018
Mar. 31, 2019
Line of Credit Facility [Line Items]      
Minimum liquidity covenant amount     $ 5,000,000
Squadron Credit Agreement      
Line of Credit Facility [Line Items]      
Current interest rate   10.50%  
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 payment at maturity   $ 25,000,000  
Debt instrument, maturity date Nov. 30, 2023 Nov. 30, 2023  
Debt carrying amount, net of issuance cost     32,200,000
Debt issuance cost, amortization period   5 years  
New debt issuance costs     $ 300,000
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) 4,800,000 845,000  
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 $ 30,000,000 $ 35,000,000  
Proceeds from secured term loan   34,100,000  
Line of credit | Squadron Credit Agreement      
Line of Credit Facility [Line Items]      
Line of credit $ 0    
Minimum liquidity covenant amount   $ 5,000,000  
Fixed Charge Coverage Ratio   100.00%  
Floor on interest rate 10.00%    
Ceiling on interest rate 13.00%    
Line of credit | Squadron Credit Agreement | Maximum      
Line of Credit Facility [Line Items]      
Debt default, interest rate increase   5.00%  
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