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Debt - Insurance Notes Payable (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) note | Dec. 31, 2016 USD ($)
Short-term Debt [Line Items] |  |
Total outstanding | $ 4,721,000 | $ 276,000
Insurance Notes Payable | Insurance Notes Payable |  |
Short-term Debt [Line Items] |  |
Number of notes financed | note | 3 |
Debt instrument, face amount | $ 5,100,000.0 |
Debt instrument, interest rate | 2.30% |
Total outstanding | $ 4,700,000 |

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