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

6 Months Ended

Jun. 30, 2023

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, 2022			60,002			$	114.80			$	—
Options granted			26,021				6.38				—
Options exercised			—				—				—
Options forfeited			(1,058	)			39.05				39,062
Options expired			(210	)			118.35				—
Outstanding — Balance at June 30, 2023			84,755			$	82.21			$	—
Vested and expected to vest — June 30, 2023			76,998			$	87.98			$	—
Exercisable — June 30, 2023			35,364			$	155.85			$	—

Weighted-Average Fair Value Assumption of Stock Option Awards

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

		Three Months Ended June 30,								Six Months Ended June 30,
		2023				2022				2023				2022
Expected term (years)			7.20				6.85				7.06				6.61
Expected volatility			124	%			123	%			124	%			122	%
Risk-free interest rate			3.59	%			2.85	%			3.61	%			2.48	%
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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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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-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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-SubTopic 10
-Subparagraph (f)(2)
-Name Accounting Standards Codification
-Paragraph 2
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