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Stock-Based Compensation (Details 3)	6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares shares
Number of awards
Balance, beginning | shares	434,451
Balance, ending | shares	434,451
Exercisable, ending | shares	235,710
Unvested, ending | shares	198,741
Weighted avg. exercise price per share
Balance, beginning	$ 1.49
Balance, ending	1.49
Exercisable, ending	1.16
Unvested, ending	1.89
Weighted avg. grant date fair value per share
Balance, beginning	1.47
Balance, ending	1.47
Exercisable, ending	1.16
Unvested, ending	$ 1.83
Weighted avg. remaining contractual life (in years)
Balance, beginning	6 years 10 months 28 days
Balance, ending	6 years 5 months 1 day
Exercisable, ending	4 years 3 months 7 days
Unvested, ending	8 years 11 months 16 days
Aggregate intrinsic value
Balance, beginning | $	$ 230,039
Balance, ending | $	157,717
Exercisable, ending | $	$ 157,717

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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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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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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