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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

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after accumulated amortization, of debt discount.

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