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Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Activity Related to Stock Options

	Number of Options				Weighted Average Exercise Price				Weighted Average Remaining Contractual Term (Years)				Aggregate Intrinsic Value
Outstanding, January 1, 2021		3,815,585			$	5.56				8.9		$	342,551
Granted		1,345,136				1.97							21,600
Exercised		—				—							—
Cancelled		(29,458	)			5.22							*
Outstanding, September 30, 2021		5,131,263			$	4.62				8.2		$	73,800
Exercisable, September 30, 2021		1,988,192			$	7.67				7.6		$	36,000

Summary of Activity Related to Restricted Stock Awards Granted

		Number of Shares				Weighted Average Grant Date Fair Value
Nonvested, January 1, 2021			25,645			$	10.07
Granted			165,413				2.41
Vested			(149,894	)			2.82
Cancelled			(5,687	)			6.38
Nonvested, September 30, 2021			35,477			$	2.82

Summary of Activity Related to Restricted Stock and Deferred Stock Units Granted

		Number of Shares				Weighted Average Grant Date Fair Value
Nonvested, January 1, 2021			1,014,123			$	1.50
Granted			438,316				2.07
Vested			(329,198	)			1.67
Cancelled			(5,354	)			1.97
Nonvested, September 30, 2021			1,117,887			$	1.67

Schedule of Recognized Stock Compensation for Equity Awards

			Three months ended September 30,							Nine months ended September 30,
		2021				2020				2021				2020
Selling, general and administrative		$	658,314			$	541,757			$	2,171,122			$	1,789,122
Research and development			87,222				179,664				314,710				649,485
Cost of goods sold			14,901				21,507				54,761				51,944
Total expense		$	760,437			$	742,928			$	2,540,593			$	2,490,551

Summary of Weighted Average Assumptions Used in Valuing Plans

	Nine months ended September 30,
	2021				2020
Fair value at grant date	$	1.33		$	0.98
Expected volatility	80.2		%		142.1	%
Risk-free interest rate	0.7		%		0.7	%
Expected holding period, in years	6.0				6.1
Dividend yield		—	%		—	%

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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