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Stockholders' Equity - Summary of option activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Weighted Average Exercise Price, Granted | $ / Shares	$ 3.82	$ 4.13
Stock Options [Member]
Number of Options Outstanding | Shares	3,427,705
Number of Options Granted | Shares	1,637
Number of Options Outstanding | Shares	3,429,342
Number of Options Exercisable | Shares	1,862,537
Weighted Average Exercise Price, Outstanding | $ / Shares	$ 3.37
Weighted Average Exercise Price, Granted | $ / Shares	5.11
Weighted Average Exercise Price, Outstanding | $ / Shares	3.37
Weighted Average Exercise Price, Exercisable | $ / Shares	$ 3.54
Weighted Average Remaining Life In Years, Outstanding	7 years 8 months 12 days
Weighted Average Remaining Life In Years, Exercisable	6 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding | $	$ 7,126,014
Aggregate Intrinsic Value, Exercisable	$ 3,889,820

X

- Definition

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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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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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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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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