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Debt - Promissory Note/FCC Civil Penalty (Details)
$ in Thousands
1 Months Ended
Jun. 30, 2015
USD ($)
payment
Jul. 31, 2013
USD ($)
installment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2014
USD ($)
Debt Instrument [Line Items]          
Total debt, net carrying value     $ 32,930 $ 33,654  
Debt, gross     32,927    
Discount on debt     7 79  
FCC Enforcement Bureau Civil Penalty          
Debt Instrument [Line Items]          
Accrued civil penalty liability         $ 2,000
Notes Payable          
Debt Instrument [Line Items]          
Total debt, net carrying value     326 1,041  
Debt, gross     333 1,120  
Notes Payable | Promissory Note          
Debt Instrument [Line Items]          
Promissory note, stated interest rate   12.75%      
Promissory note, number of monthly payments | installment   42      
Total debt, net carrying value       100  
Debt, gross   $ 4,100 0 120  
Notes Payable | FCC Enforcement Bureau Civil Penalty          
Debt Instrument [Line Items]          
Total debt, net carrying value $ 1,700   300 900  
Debt, gross $ 2,000   $ 333 $ 1,000  
Number of quarterly payments | payment 12        
Imputed interest rate 12.75%        
Discount on debt $ 300