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Credit Facility (Details Textual) - USD ($)
1 Months Ended 9 Months Ended
Dec. 31, 2011
Sep. 30, 2016
Dec. 31, 2015
Vehicle Financing Agreement      
Debt Instrument [Line Items]      
Borrowings outstanding under vehicle financing agreements   $ 100,000 $ 91,000
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   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   $ 10,700,000  
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%