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Long-Term Debt - Future Contractual Principal Payments (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Future contractual principal payments on long term debt |  |
2018 | $ 8 |
2019 | 8 |
2020 | 200,009 |
2021 | 9 |
Total | $ 200,034 | $ 34

X
- Definition Amount of long-term debt and capital lease obligations including current maturities. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Principal amount of long-term debt and capital lease obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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X
- Definition Principal amount of long-term debt and capital lease obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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X
- Definition Principal amount of long-term debt and capital lease obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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Period Type: | instant

X
- Definition Amount of long-term debt and capital lease obligation maturing in the remainder of the fiscal year following the latest fiscal year ended. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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