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Debt - FCC Civil Penalty (Details) $ in Thousands | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) payment | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |
Principal |  | $ 258,781 |  |
Total debt, net carrying value |  | 190,646 | $ 32,930 |
FCC Civil Penalty |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accrued civil penalty liability |  |  |  | $ 2,000
Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal |  | 0 | 333 |
Discount on debt |  | 0 | 7 |
Total debt, net carrying value |  | $ 0 | 326 |
Notes Payable | FCC Civil Penalty |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal | $ 2,000 |  | 300 |
Debt instrument, number of quarterly payments | payment | 12 |  |  |
Debt instrument, stated interest rate | 12.75% |  |  |
Discount on debt | $ 300 |  |  |
Total debt, net carrying value | $ 1,700 |  | $ 300 |

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