A summary of option activity under the 2009, 2012 and 2019 Plans and related information during the six months ended June 30, 2020 is as follows: (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares under options, exercised	(313,638)	(664,304)	(276,383)
Share-based Payment Arrangement, Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares under options, beginning		25,030,234
Weighted average exercise price, beginning		$ 4.65
Weighted average remaining contractual life		5 years 7 months 2 days		5 years 10 months 2 days
Aggregate intrinsic value, beginning		$ 3,668,171
Number of shares under options, granted		736,500
Weighted average exercise price, granted		$ 1.58
Number of shares under options, exercised		(664,304)
Weighted average exercise price, exercised		$ 0.25
Aggregate intrinsic value, exercised		$ 1,027,627
Number of shares under options, expired		(197,914)
Weighted average exercise price, expired		$ 2.53
Number of shares under options, cancelled forfeited		(314,375)
Weighted average exercise price, cancelled forfeited		$ 3.82
Number of shares under options, ending	24,590,141	24,590,141		25,030,234
Weighted average exercise price, ending	$ 4.70	$ 4.70		$ 4.65
Aggregate intrinsic value, ending	$ 721,720	$ 721,720		$ 3,668,171
Number of shares under options, vested and exercisable ending	19,725,267	19,725,267
Weighted average exercise price, vested and exercisable ending	$ 5.02	$ 5.02
Weighted average remaining contractual life, vested and exercisable		4 years 9 months 18 days
Aggregate intrinsic value, vested and exercisable ending	$ 673,250	$ 673,250
Number of shares under options, unvested ending	4,864,874	4,864,874
Weighted average exercise price, unvested ending	$ 3.42	$ 3.42
Weighted average remaining contractual life, unvested		8 years 9 months 29 days
Aggregate intrinsic value, unvested ending	$ 48,470	$ 48,470

Weighted average remaining contractual term for unvested options, in 'PnYnMnDTnHnMnS' format,

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Weighted average price at which grantees can acquire unvested shares reserved for issuance.

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

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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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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-SubTopic 10
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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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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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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Number of non-vested options outstanding.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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