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LONG-TERM DEBT AND WARRANT LIABILITY - Third Amendment in December 2018 Narrative (Details) - USD ($)
1 Months Ended 12 Months Ended
Mar. 15, 2019
Dec. 24, 2018
Jan. 11, 2018
Jan. 03, 2017
Mar. 29, 2019
Feb. 22, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]                  
Debt discount       $ 3,700,000     $ 3,300,000 $ 3,212,000  
Debt issuance costs incurred   $ 1,300,000         800,000    
Amortization of debt issuance costs and discount   1,200,000         $ 1,418,000 $ 1,211,000 $ 665,000
Capitalized incremental deferred finance costs   100,000 $ 300,000            
Syndicate of Lenders | Line of Credit                  
Debt Instrument [Line Items]                  
Maximum borrowing capacity   422,500,000 $ 292,500,000 $ 225,000,000.0          
Revolving Credit Facility | Syndicate of Lenders | Line of Credit                  
Debt Instrument [Line Items]                  
Unused commitment fee percentage     0.50% 0.50%          
Maximum borrowing capacity     $ 25,000,000.0 $ 25,000,000.0          
Term Loan | Syndicate of Lenders | Line of Credit                  
Debt Instrument [Line Items]                  
Additional borrowings   60,000,000.0 67,500,000            
Debt discount   300,000 400,000            
Additional borrowings, undrawn   70,000,000.0              
Additional borrowings, drawn and undrawn   $ 130,000,000.0              
Additional fee percentage   0.50%              
Face amount of debt   $ 327,500,000 $ 267,500,000 200,000,000.0          
Term Loan | Goldman Sachs Specialty Lending Group | Line of Credit                  
Debt Instrument [Line Items]                  
Face amount of debt       $ 80,000,000.0          
Subsequent Event | Revolving Credit Facility                  
Debt Instrument [Line Items]                  
Additional borrowings $ 10,000,000.0                
Subsequent Event | Term Loan | Syndicate of Lenders | Line of Credit                  
Debt Instrument [Line Items]                  
Additional borrowings $ 5,000,000.0                
Unused commitment fee percentage         5.00% 2.50%