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Credit Facility (Details Textual) - USD ($)
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Vehicle Financing Agreement      
Debt Instrument [Line Items]      
Repayment period 3 years    
Borrowings outstanding under vehicle financing agreements $ 69,000   $ 91,000
Vehicle Financing Agreement | Minimum      
Debt Instrument [Line Items]      
Interest rate percentage, minimum 1.90%    
Vehicle Financing Agreement | Maximum      
Debt Instrument [Line Items]      
Interest rate percentage, minimum 3.90%    
Revolving Credit Facility | LIBOR      
Debt Instrument [Line Items]      
Credit facility interest on borrowings, percentage added to rate   2.25%  
Revolving Credit Facility | East West Bank      
Debt Instrument [Line Items]      
Revolving line of credit $ 25,000,000    
Amount available under revolving line of credit $ 12,000,000    
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%