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Debt - Insurance Notes Payable (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term debt | $ 3,889,000 | $ 5,627,000
Insurance Notes Payable | Insurance Notes Payable Due October 2019 |  |
Short-term Debt [Line Items] |  |
Debt instrument, face amount |  | $ 6,800,000.0
Debt instrument, interest rate |  | 3.90%
Short-term debt | $ 3,900,000 | $ 5,600,000

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