Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Schedule of Net Accounts Receivable Balance Concentrations by Major Category (Parenthetical) (Details)

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Summary of Significant Accounting Policies - Schedule of Net Accounts Receivable Balance Concentrations by Major Category (Parenthetical) (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Customer
Dec. 31, 2016
USD ($)
Customer
Accounts Notes And Loans Receivable [Line Items]    
Accounts receivable, net $ 31,444,000 $ 30,828,000
Customer Concentration Risk | Business To Business Receivables    
Accounts Notes And Loans Receivable [Line Items]    
Number of customers | Customer 1 1
Accounts receivable, net $ 10,394,000 $ 9,791,000
Credit insurance policy, deductible amount $ 1,000,000  
Credit insurance policy, retention percentage 10.00%  
Customer Concentration Risk | Business To Business Receivables | Maximum    
Accounts Notes And Loans Receivable [Line Items]    
Credit insurance policy, coverage limit $ 12,000,000 $ 9,000,000