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Stock-Based Compensation - Summary of Stock Option Awards and Restricted Stock Grants (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Weighted Average Exercise Price, Options granted	$ 2.24	$ 1.01
Stock Options [Member]
Number Outstanding, Outstanding, Beginning balance	4,624,725
Number Outstanding, Options granted	2,032,500
Number Outstanding, Options exercised or vested and issued	(7,500)
Number Outstanding, Options canceled or expired	(92,646)
Number Outstanding, Outstanding, Ending balance	6,557,079
Number Outstanding, Exercisable, Ending balance	4,063,706
Weighted Average Exercise Price, Outstanding, Beginning balance	$ 2.77
Weighted Average Exercise Price, Options granted	2.24
Weighted Average Exercise Price, Options exercised or vested and issued	0.63
Weighted Average Exercise Price, Options canceled or expired	2.69
Weighted Average Exercise Price, Outstanding, Ending balance	2.65
Weighted Average Exercise Price, Exercisable, Ending balance	$ 2.70
Weighted Average Remaining Contractual Term (years), Outstanding, Ending balance	8 years
Weighted Average Remaining Contractual Term (years), Exercisable, Ending balance	7 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding, Ending balance	$ 13,163
Aggregate Intrinsic Value, Exercisable, Ending balance	$ 3,300
Restricted Stock [Member]
Number Outstanding, Non-vested stock awards, Outstanding, Beginning balance	2,750
Number Outstanding, Non-vested stock awards, Granted	1,000
Number Outstanding, Non-vested stock awards, exercised or vested and issued
Number Outstanding, Non-vested stock awards, Forfeited
Number Outstanding, Non-vested stock awards, Outstanding, Ending balance	3,750
Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Beginning balance	$ 0.89
Weighted Average Grant Date Fair Value, Non-vested stock awards, Granted	2.22
Weighted Average Grant Date Fair Value, Non-vested stock awards, exercised or vested and issued
Weighted Average Grant Date Fair Value, Non-vested stock awards, Forfeited
Weighted Average Grant Date Fair Value, Non-vested stock awards, Outstanding, Ending balance	$ 1.31
Aggregate Intrinsic Value, Non-vested stock awards, Outstanding, Ending balance	$ 7,875

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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For presentations that combine terminations, 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 or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net 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 price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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