Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2021

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Warrant Activity

The following table summarizes the warrants issued and outstanding as of December 31, 2021:

Warrants Issued and Outstanding as of December 31, 2021
	Date of		Exercise		Shares of
Description	Issuance	Expiration	Price		Common Stock
Exercisable warrants	10/19/2020	3/19/2028	$	1.50		500,000
Exercisable warrants	10/19/2021	3/19/2028	$	1.50		350,000
Total warrants issued and outstanding						850,000

Summary of Stock Option Activity

The following table summarizes the stock option activity from January 1, 2020 through December 31, 2021:

	Stock Options
					Weighted-
				Exercise	Average
	Number			Price Per	Exercise Price
	of Shares			Share	Per Share
Outstanding at January 1, 2020		2,445,453		$1.17 — $23.20	$	3.37
Granted		998,713		$1.35  — $2.32	$	1.56
Canceled/Forfeited		(266,224	)	$1.48 — $16.80	$	3.55
Outstanding at December 31, 2020		3,177,942		$1.17 — $23.20	$	2.78
Granted		323,063		$3.01  — $6.30	$	4.47
Exercised		(176,427	)	$1.48  — $6.40	$	2.98
Canceled/Forfeited		(43,993	)	$1.48 — $23.20	$	7.85
Outstanding at December 31, 2021		3,280,585		$1.17 — $23.20	$	2.87

Summary of Stock Option Outstanding

The following additional information applies to options outstanding at December 31, 2021:

Range of Exercise Prices	Outstanding at December 31, 2021		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price		Exercisable at December 31, 2021		Weighted- Average Exercise Price
$1.17 - $23.20		3,280,585		6.8	$	2.87		2,357,641	$	2.95

The following additional information applies to options outstanding at December 31, 2020:

Range of Exercise Prices	Outstanding at December 31, 2020		Weighted- Average Remaining Contractual Life		Weighted- Average Exercise Price		Exercisable at December 31, 2020		Weighted- Average Exercise Price
$1.17 - $23.20		3,177,942		7.4	$	2.78		1,877,392	$	3.40

Schedule of Weighted-Average Estimated Value of Employee Stock Options Granted

The weighted-average estimated value of employee stock options granted during the years ended December 31, 2021 and 2020 were estimated using the Black-Scholes-Merton option pricing model with the following weighted-average assumptions:

	Years Ended December 31,
	2021			2020
Expected volatility		72	%		75	%
Risk-free interest rate		1.08	%		0.49	%
Expected dividends		0.00	%		0.00	%
Expected term in years		6.0			5.7

Warrant [Member]

Share Based Compensation Arrangement By Share Based Payment Award [Line Items]

Summary of Warrant Activity

Warrant activity from January 1, 2020 through December 31, 2021 was as follows:

	Warrants
			Weighted-
			Average
	Number	Exercise Price	Exercise Price
	of Shares	per Share	Per Share
Outstanding at January 1, 2020	521,060	$1.15  — $3.88	$1.62
Issued	500,000	$1.50	$1.50
Outstanding at December 31, 2020	1,021,060	$1.15  — $3.88	$1.56
Issued	350,000	$1.50	$1.50
Exercised	(181,834)	$1.15  — $3.88	$1.23
Canceled/Forfeited	(339,226)	$1.15  — $3.88	$1.83
Outstanding at December 31, 2021	850,000	$1.50	$1.50