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Stock-Based Compensation - Narrative (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Option and restricted stock unit vesting period (up to) 3 years  
Stock based compensation $ 96,871 $ 377,847
Compensation cost related to non vested awards not yet recognized $ 810,790  
Average remaining expense recognition period 1 year 6 months