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Debt - Schedule of Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2015
Jul. 31, 2013
Debt Instrument [Line Items]        
Debt, gross $ 32,927      
Less: discount (7) $ (79)    
Total debt, net carrying value 32,930 33,654    
Less: current portion of debt (336) (742)    
Total debt, less current portion 32,594 32,912    
Notes Payable        
Debt Instrument [Line Items]        
Debt, gross 333 1,120    
Total debt, net carrying value 326 1,041    
Notes Payable | Promissory Note to USAC        
Debt Instrument [Line Items]        
Debt, gross 0 120   $ 4,100
Total debt, net carrying value   100    
Notes Payable | FCC Civil Penalty        
Debt Instrument [Line Items]        
Debt, gross 333 1,000 $ 2,000  
Less: discount     (300)  
Total debt, net carrying value 300 900 $ 1,700  
Line of Credit        
Debt Instrument [Line Items]        
Debt, gross 32,594 32,594    
Interest accretion under 2016 line of credit $ 10 $ 19