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Debt - Insurance Notes Payable (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
note
Dec. 31, 2018
USD ($)
Short-term Debt [Line Items]    
Total outstanding $ 4,721,000 $ 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%
Total outstanding   $ 5,600,000
Insurance Notes Payable | Insurance Notes Payable Due October 2018    
Short-term Debt [Line Items]    
Number of notes financed | note 3  
Debt instrument, face amount $ 5,100,000.0  
Debt instrument, interest rate 2.90%  
Total outstanding $ 4,700,000