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Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2022

Equity [Abstract]

Schedule of stockholders' equity note, warrants or rights

As of June 30, 2022 and 2021, we had the following outstanding January 2020 warrants to purchase shares of common stock:

			As of June 30, 2022						As of June 30, 2021
			Number of Underlying Shares												Exercise Price						Expiration
Investor Warrants			187,734						269,180						$3.3700						January 13, 2025
Placement Agent Warrants			41,680						41,680						$4.9940						January 13, 2025
			229,414						310,860

Summary of stock-based compensation expense

The following table summarizes stock-based compensation expense and the impact it had on operations for the periods presented (in thousands):

			Three months ended June 30,												Six months ended June 30,
			2022						2021						2022						2021
Cost of sales			$	1					$	3					$	2					$	5
Product development			6						2						12						8
Selling, general, and administrative			47						203						84						335
Total stock-based compensation			$	54					$	208					$	98					$	348

Schedule of valuation assumptions

Estimates utilized in the calculation include the expected life of the option, risk-free interest rate, and expected volatility, and are further detailed below.

			Six months ended June 30,
			2022						2021
Fair value of options issued			$	1.13					$	4.24
Exercise price			$	1.43					$	5.48
Expected life of options (in years)			6.1						6.2
Risk-free interest rate			2.0		%				0.8		%
Expected volatility			99.3		%				96.4		%
Dividend yield			0.0		%				0.0		%

Summary of option activity

A summary of option activity under all outstanding stock incentive plans for the six months ended June 30, 2022 is presented as follows:

			Number of Options						Weighted Average Exercise Price Per Share						Weighted Average Remaining Contractual Life (in years)
Balance at December 31, 2021			267,109						$	3.46
Granted			65,680						1.43
Exercised			(250)						1.45
Canceled/forfeited			(109,122)						2.74
Balance at June 30, 2022			223,417						$	3.22					7.3
Vested and expected to vest at June 30, 2022			197,739						$	3.26					7.0
Exercisable at June 30, 2022			116,179						$	3.38					5.8

Summary of restricted stock activity

A summary of restricted stock unit activity under all outstanding stock incentive plans for the six months ended June 30, 2022 is presented as follows:

			Restricted Stock Units						Weighted Average Grant Date Fair Value						Weighted Average Remaining Contractual Life (in years)
Balance at December 31, 2021			2,400						$	7.14
Granted			40,000						1.40
Vested			(40,000)						1.40
Balance at June 30, 2022			2,400						$	7.14					8.2

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Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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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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Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable.

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