Quarterly report pursuant to Section 13 or 15(d)

Fair Value of Financial Instruments - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details)

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Fair Value of Financial Instruments - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Fair Value, Input, Level 3 [Member] - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance, beginning $ 603,411 $ 929,549
Change in fair value 31,749 (11,188)
Payments (47,111) (23,650)
Balance, ending $ 588,049 $ 894,711