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

6 Months Ended

Jun. 30, 2024

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, 2023			80,078			$	85.30			$	—
Options forfeited			(3,425	)			21.71				—
Options expired			(12,479	)			164.76				—
Outstanding — Balance at June 30, 2024			64,174			$	73.23			$	—
Vested and expected to vest — June 30, 2024			72,526			$	75.84			$	—
Exercisable — June 30, 2024			42,084			$	91.70			$	—

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,
		2024				2023				2024				2023
Expected term (years)			—				7.20				—				7.06
Expected volatility			—				124	%			—				124	%
Risk-free interest rate			—				3.59	%			—				3.61	%
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.

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-Name Accounting Standards Codification
-Section 50
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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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