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Fair Value Measurements - Narrative (Details) - USD ($) | Dec. 31, 2017 | Feb. 10, 2017 | Oct. 04, 2016
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New Building Note | Secured Notes |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Face amount of debt instrument |  | $ 35,000,000.0 | $ 35,000,000.0
Fair Value, Measurements, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair value of investments | $ 5,072,000 |  |
Fair Value, Measurements, Recurring | Fair Value Measurements Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair value of investments | 0 |  |
Other current assets | Fair Value, Measurements, Recurring | Fair Value Measurements Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis |  |  |
Fair value of investments | $ 5,072,000 |  |

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