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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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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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