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

6 Months Ended

Jun. 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			1,030,822				1.16
Options exercised			—				—
Options forfeited			(130,263	)			2.86
Options expired			(39,105	)			6.21
Outstanding — Balance at June 30, 2022			2,283,649			$	3.54			$	31,230
Vested and expected to vest — June 30, 2022			2,011,343			$	3.82			$	24,452
Exercisable — June 30, 2022			862,726			$	6.76			$	—

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 June 30,								Six Months Ended June 30,
		2022				2021				2022				2021
Expected term (years)			6.85				6.84				6.61				6.37
Expected volatility			123	%			122	%			122	%			122	%
Risk-free interest rate			2.85	%			1.06	%			2.48	%			0.81	%
Dividend yield			—				—				—				—

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- Definition

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
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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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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