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Fair Value Measurement (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Contingent consideration      
Liabilities:      
Contingent consideration obligation $ (1,848,072)    
Minimum      
Fair value measurement:      
Discount rate used to determine fair value of contingent consideration 5.00%    
Maximum      
Fair value measurement:      
Discount rate used to determine fair value of contingent consideration 6.00%    
Level 3      
Fair value measurement:      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 1,176,417   $ 0
Reconciliation of the beginning and ending balances of the liabilities measured at fair value      
Balance at beginning of period (4,086,697)    
Change in fair value 152,382    
Settlements 2,086,243    
Balance at end of period (1,848,072)    
Level 3 | Contingent consideration      
Reconciliation of the beginning and ending balances of the liabilities measured at fair value      
Settlements   $ 2,665,833  
Level 3 | Selling, general and administrative expenses      
Reconciliation of the beginning and ending balances of the liabilities measured at fair value      
Change in fair value (152,382) $ (95,934)  
Fair Value, Measurements, Recurring | Contingent consideration      
Liabilities:      
Contingent consideration obligation (1,848,072)   (4,086,697)
Fair Value, Measurements, Recurring | Level 1 | Contingent consideration      
Liabilities:      
Contingent consideration obligation 0   0
Fair Value, Measurements, Recurring | Level 2 | Contingent consideration      
Liabilities:      
Contingent consideration obligation 0   0
Fair Value, Measurements, Recurring | Level 3 | Contingent consideration      
Liabilities:      
Contingent consideration obligation (1,848,072)   $ (4,086,697)
Contingent consideration      
Reconciliation of the beginning and ending balances of the liabilities measured at fair value      
Contingent consideration receivable 1,176,417    
Contingent consideration | Maximum      
Reconciliation of the beginning and ending balances of the liabilities measured at fair value      
Contingent consideration receivable 1,500,000    
Contingent consideration | Fair Value, Measurements, Recurring | Level 1      
Reconciliation of the beginning and ending balances of the liabilities measured at fair value      
Contingent consideration receivable 0    
Contingent consideration | Fair Value, Measurements, Recurring | Level 2      
Reconciliation of the beginning and ending balances of the liabilities measured at fair value      
Contingent consideration receivable 0    
Contingent consideration | Fair Value, Measurements, Recurring | Level 3      
Reconciliation of the beginning and ending balances of the liabilities measured at fair value      
Contingent consideration receivable $ 1,176,417