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Stock-Based Compensation - Schedule of Stock Option Awards and Restricted Stock Grants (Details) - USD ($)
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Weighted Average Grant Date Fair Value, Granted $ 1.90 $ 2.27
Stock Options [Member]    
Number Outstanding, Outstanding, Beginning Balance 3,148,743 703,442
Number Outstanding, Granted 454,504  
Number Outstanding, Cancelled or expired (11,355)  
Number Outstanding, Ending Balance 3,591,892  
Number Outstanding, Exercisable 1,684,265  
Weighted Average Exercise Price, Outstanding, Beginning Balance $ 2.67  
Weighted Average Exercise Price, Granted 2.18  
Weighted Average Exercise Price, Cancelled or expired 2.37  
Weighted Average Exercise Price, Outstanding, Ending Balance 2.60  
Weighted Average Exercise Price, Exercisable $ 2.97  
Weighted Average Remaining Contractual Term (years), Outstanding, Ending Balance 9 years 1 month 6 days  
Weighted Average Remaining Contractual Term (years), Exercisable 9 years 3 months 19 days  
Aggregate Intrinsic Value, Outstanding, Ending Balance  
Aggregate Intrinsic Value, Exercisable  
Restricted Stock Awards [Member]    
Non-vested stock awards outstanding, Beginning Balance 22,500  
Non-vested stock awards outstanding, Granted 13,000  
Non-vested stock awards outstanding, Vested and issued (8,000)  
Non-vested stock awards outstanding, Forfeited  
Non-vested stock awards outstanding, Ending Balance 27,500  
Non-vested stock awards outstanding, Aggregate intrinsic value, Ending Balance $ 53,900  
Weighted Average Grant Date Fair Value, Beginning Balance $ 2.72  
Weighted Average Grant Date Fair Value, Granted 2.18  
Weighted Average Grant Date Fair Value, Vested and issued 2.60  
Weighted Average Grant Date Fair Value, Forfeited  
Weighted Average Grant Date Fair Value, Ending Balance $ 2.50