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Stock-Based Compensation - Schedule of Stock Option Awards and Restricted Stock Grants (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Weighted Average Grant Date Fair Value, Equity awards granted	$ 1.88	$ 2.23
Stock Options [Member]
Number Outstanding, Outstanding, Beginning Balance	3,148,743
Number Outstanding, Equity awards granted	805,004
Number Outstanding, Vested and issued
Number Outstanding, Cancelled or expired	(11,355)
Number Outstanding, Ending Balance	3,942,392
Number Outstanding, Exercisable	2,420,261
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 2.67
Weighted Average Exercise Price, Equity awards granted	2.16
Weighted Average Exercise Price, Vested and issued
Weighted Average Exercise Price, Cancelled or expired	2.37
Weighted Average Exercise Price, Outstanding, Ending Balance	2.56
Weighted Average Exercise Price, Exercisable	$ 2.77
Weighted Average Remaining Contractual Term (years), Outstanding, Ending Balance	8 years 10 months 25 days
Weighted Average Remaining Contractual Term (years), Exercisable	8 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding, Ending Balance
Aggregate Intrinsic Value, Exercisable	$ 50,050
Restricted Stock Awards [Member]
Non-vested stock awards outstanding, Beginning Balance	22,500
Non-vested stock awards outstanding, Equity awards granted	15,500
Non-vested stock awards outstanding, Vested and issued	(10,500)
Non-vested stock awards outstanding, Equity awards forfeited, cancelled or expired
Non-vested stock awards outstanding, Ending Balance	27,500
Non-vested stock awards outstanding, Aggregate intrinsic value, Ending Balance	$ 27,500
Weighted Average Grant Date Fair Value, Beginning Balance	$ 2.72
Weighted Average Grant Date Fair Value, Equity awards granted	2.17
Weighted Average Grant Date Fair Value, Vested and issued	2.49
Weighted Average Grant Date Fair Value, Forfeited
Weighted Average Grant Date Fair Value, Ending Balance	$ 2.30

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Intrinsic value of outstanding award under share-based payment arrangement. Excludes share and unit options.

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