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Fair Value Measurements - Rollforward (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning Balance $ 498,086 $ 445,838
Total income (loss) recognized in earnings (5,759) 0
Ending Balance $ 492,327 $ 445,838