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Fair Value Measurements - Rollforward (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Beginning Balance $ 492,327 $ 445,838 $ 498,086 $ 445,838
Total income (loss) recognized in earnings (2,838) 37,033 (8,597) 37,033
Ending Balance $ 489,489 $ 482,871 $ 489,489 $ 482,871