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Credit Facility (Details Textual) - USD ($)
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Vehicle Financing Agreement    
Debt Instrument [Line Items]    
Borrowings outstanding under vehicle financing agreements $ 77,000 $ 83,000
Vehicle Financing Agreement | Minimum    
Debt Instrument [Line Items]    
Interest rate percentage, minimum 0.90%  
Vehicle Financing Agreement | Maximum    
Debt Instrument [Line Items]    
Repayment period 3 years  
Interest rate percentage, minimum 1.90%  
Revolving Credit Facility | East West Bank    
Debt Instrument [Line Items]    
Revolving line of credit $ 25,000,000  
Amount available under revolving line of credit $ 15,500,000  
Percentage of equity interests pledged 100.00%  
Annual commitment fee amount $ 125,000  
Revolving Credit Facility | East West Bank | Minimum    
Debt Instrument [Line Items]    
Unused commitment fee percentage 0.30%  
Revolving Credit Facility | East West Bank | Maximum    
Debt Instrument [Line Items]    
Unused commitment fee percentage 0.50%  
Revolving Credit Facility | East West Bank | Prime Rate | Minimum    
Debt Instrument [Line Items]    
Credit facility interest on borrowings, percentage added to rate 0.00%  
Revolving Credit Facility | East West Bank | Prime Rate | Maximum    
Debt Instrument [Line Items]    
Credit facility interest on borrowings, percentage added to rate 0.50%  
Revolving Credit Facility | East West Bank | LIBOR | Minimum    
Debt Instrument [Line Items]    
Credit facility interest on borrowings, percentage added to rate 2.75%  
Revolving Credit Facility | East West Bank | LIBOR | Maximum    
Debt Instrument [Line Items]    
Credit facility interest on borrowings, percentage added to rate 3.25%