Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT AND COMMON STOCK WARRANT LIABILITY - Common Stock Warrant Liability Narrative (Details)

v3.19.1
LONG-TERM DEBT AND COMMON STOCK WARRANT LIABILITY - Common Stock Warrant Liability Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 13, 2016
$ / shares
shares
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Class of Warrant or Right [Line Items]      
Expected contractual term   7 years 4 months 13 days 3 years 10 months 2 days
Change in value of stock warrants   $ (1,671) $ 1,379
Line of Credit | Second Lien Credit Agreement | Warrant to Purchase Common Equity      
Class of Warrant or Right [Line Items]      
Warrants issued (in shares) | shares 1,006,568    
Warrants granted as a percent of outstanding common equity 5.00%    
Warrant exercise price (in USD per share) | $ / shares $ 1.67    
Warrants, period for measuring warrant exercise price 60 days    
Warrants, period for mandatory registration rights 2 years    
Warrant, redemption rights, period for measuring repurchase value 21 days    
Change in value of stock warrants   $ (1,700) $ 1,400
Unsecured Debt | Second Lien Credit Agreement | Warrant to Purchase Common Equity      
Class of Warrant or Right [Line Items]      
Term 4 years    
Interest rate 13.25%    
Price volatility rate      
Class of Warrant or Right [Line Items]      
Input assumptions, expected rate   0.4326 0.4755
Expected dividend rate      
Class of Warrant or Right [Line Items]      
Input assumptions, expected rate   0 0
Risk free interest rate      
Class of Warrant or Right [Line Items]      
Input assumptions, expected rate   0.0264 0.0213