Fair Value Measurement - Assets and Liabilities at Fair Value (Details) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Contingent consideration    
Liabilities:    
Contingent consideration due to seller $ (1,700,000)  
Contingent consideration    
Assets:    
Contingent consideration due from seller 395,392  
Fair Value, Measurements, Recurring | Contingent consideration    
Liabilities:    
Contingent consideration due to seller (1,710,000) $ (4,086,697)
Fair Value, Measurements, Recurring | Contingent consideration | Level 1    
Liabilities:    
Contingent consideration due to seller 0 0
Fair Value, Measurements, Recurring | Contingent consideration | Level 2    
Liabilities:    
Contingent consideration due to seller 0 0
Fair Value, Measurements, Recurring | Contingent consideration | Level 3    
Liabilities:    
Contingent consideration due to seller (1,710,000) $ (4,086,697)
Fair Value, Measurements, Recurring | Contingent consideration    
Assets:    
Contingent consideration due from seller 395,392  
Fair Value, Measurements, Recurring | Contingent consideration | Level 1    
Assets:    
Contingent consideration due from seller 0  
Fair Value, Measurements, Recurring | Contingent consideration | Level 2    
Assets:    
Contingent consideration due from seller 0  
Fair Value, Measurements, Recurring | Contingent consideration | Level 3    
Assets:    
Contingent consideration due from seller $ 395,392