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Debt - Schedule of Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Jun. 30, 2015 | Jul. 31, 2013
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Debt Instrument [Line Items] |  |  |  |
Debt, gross | $ 32,927 |  |  |
Less: discount | (7) | $ (79) |  |
Total debt, net carrying value | 32,930 | 33,654 |  |
Less: current portion of debt | (336) | (742) |  |
Total debt, less current portion | 32,594 | 32,912 |  |
Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, gross | 333 | 1,120 |  |
Total debt, net carrying value | 326 | 1,041 |  |
Notes Payable | Promissory Note to USAC |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, gross | 0 | 120 |  | $ 4,100
Total debt, net carrying value |  | 100 |  |
Notes Payable | FCC Civil Penalty |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, gross | 333 | 1,000 | $ 2,000 |
Less: discount |  |  | (300) |
Total debt, net carrying value | 300 | 900 | $ 1,700 |
Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, gross | 32,594 | 32,594 |  |
Interest accretion under 2016 line of credit | $ 10 | $ 19 |  |

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- Definition 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. + 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 FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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