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Debt - Promissory Note/FCC Civil Penalty (Details)	1 Months Ended
	Jul. 31, 2013 USD ($) installment	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 12, 2015 USD ($)	Sep. 30, 2014 USD ($)
Debt Instrument [Line Items]
Debt, gross		$ 33,714,000
Discount on debt		79,000	$ 1,087,000
Total debt, net carrying value		33,654,000	37,039,000
FCC Enforcement Bureau Civil Penalty
Debt Instrument [Line Items]
Civil penalty					$ 2,000,000
Notes Payable
Debt Instrument [Line Items]
Debt, gross		1,120,000	25,626,000
Total debt, net carrying value		1,041,000	24,539,000
Notes Payable | Promissory Note
Debt Instrument [Line Items]
Promissory note issued	$ 4,100,000.0
Promissory note, stated interest rate	12.75%
Promissory note, number of monthly payments | installment	42
Notes Payable | Promissory Note to USAC
Debt Instrument [Line Items]
Debt, gross		120,000	1,459,000
Notes Payable | FCC Enforcement Bureau Civil Penalty
Debt Instrument [Line Items]
Promissory note, stated interest rate				12.75%
Debt, gross		1,000,000	$ 1,667,000
Civil penalty				$ 2,000,000
Present value of civil penalty				1,700,000
Discount on debt				$ 300,000
Total debt, net carrying value		$ 900,000
FCC Enforcement Bureau Civil Penalty
Debt Instrument [Line Items]
Accrued liability for civil penalty						$ 2,000,000

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-SubTopic 30
-Section 55
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Contractual interest rate for funds borrowed, under the debt agreement.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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