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Notes Payable (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Line of Credit Facility [Line Items]    
Notes Payable, Current $ 1,500 $ 5,120
Line of Credit [Member] | Brokerage Firm [Member]    
Line of Credit Facility [Line Items]    
Line of credit facility basis points 125.00%  
Line of credit facility, interest rate 1.91%  
Line of credit facilitry amount outstanding $ 1,500 5,120
Line of credit facility collateral requirement $ 2,000 $ 6,826