Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT AND COMMON STOCK WARRANT LIABILITY - Schedule of Long-term Debt, Related Discounts and Issuance Costs (Details)

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LONG-TERM DEBT AND COMMON STOCK WARRANT LIABILITY - Schedule of Long-term Debt, Related Discounts and Issuance Costs (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Feb. 02, 2018
Dec. 31, 2017
Debt Instrument [Line Items]      
Outstanding principal $ 99,000   $ 96,063
Unamortized discounts and debt issuance costs (3,806)   (1,497)
Long-term debt, net 95,194   94,566
Current portion of long-term debt (1,000)   (1,000)
Long-term debt, net of current portion, unamortized discount and issuance costs 94,194   93,566
Senior Secured Notes      
Debt Instrument [Line Items]      
Outstanding principal 99,000    
Senior secured notes due 2024 | Senior Secured Notes      
Debt Instrument [Line Items]      
Outstanding principal 99,000   0
First Lien Credit Facility | Term Loan | Line of Credit      
Debt Instrument [Line Items]      
Outstanding principal 0 $ 41,000 41,063
Second Lien Term Loan | Term Loan | Line of Credit      
Debt Instrument [Line Items]      
Outstanding principal $ 0 $ 55,000 $ 55,000