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Fair Value Measurements - Loan and Security Agreement (Details) - Solar Capital and Western Alliance Bank Loan Agreement [Member] - USD ($) | 1 Months Ended | 6 Months Ended
--- | --- | ---
May 31, 2018 | Jun. 30, 2018
Fair Value Measurements |  |
Exit Fee | $ 1,500,000 |
Exit fee payable term (in years) | 10 years |
Level 3 |  |
Fair Value Measurements |  |
Potential payment to Solar Capital Ltd. and Western Alliance Bank |  | $ 1,500,000
Percentage of increase in risk component |  | 10.00%
Percentage decrease in risk component |  | 10.00%
Fair value fluctuation due to increase in risk component |  | $ 55,000,000
Fair value fluctuation due to decrease in risk component |  | $ 55,000,000
Other Current Liabilities |  |
Fair Value Measurements |  |
Estimated fair value of Exit Fee | $ 546,000 |

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