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Stock-Based Compensation and Employee Stock Purchase Program (Tables)

9 Months Ended

Sep. 30, 2022

Share-Based Payment Arrangement [Abstract]

Summary of Activity Under Stock Incentive Plans

The following is a summary of stock option information and weighted average exercise prices under the Company’s stock incentive plans (in thousands, except share data and price per share):

		Shares Subject to Outstanding Options				Weighted- Average Exercise Price Per Share				Aggregate Intrinsic Value
Outstanding — Balance at December 31, 2021			1,422,195			$	5.28			$	—
Options granted			1,320,322				1.11				297.00
Options exercised			—				—
Options forfeited			(266,347	)			2.29
Options expired			(74,436	)			6.04
Outstanding — Balance at September 30, 2022			2,401,734			$	3.29
Vested and expected to vest — September 30, 2022			2,115,782			$	3.55
Exercisable — September 30, 2022			873,633			$	6.59			$	—

Weighted-Average Fair Value Assumption of Stock Option Awards

The fair value of stock option awards was estimated at the date of grant using a Black-Scholes option-pricing model with the following weighted-average assumption:

		Three Months Ended September 30,								Nine Months Ended September 30,
		2022				2021				2022				2021
Expected term (years)			5.69				6.08				6.41				6.34
Expected volatility			122	%			121	%			122	%			122	%
Risk-free interest rate			2.99	%			0.97	%			2.59	%			0.83	%
Dividend yield			—				—				—				—

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
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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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-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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