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

3 Months Ended

Mar. 31, 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		80,030		$	85.30	$	—
Options granted		—			—		—
Options exercised		—			—		—
Options forfeited		(1,561	)		15.13		—
Options expired		(1,787	)		70.99		—
Outstanding — Balance at March 31, 2024		76,682		$	87.06	$	—
Vested and expected to vest — March 31, 2024		72,526		$	90.78	$	—
Exercisable — March 31, 2024		42,084		$	138.73	$	—

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 March 31,
	2024		2023
Expected term (years)		—		5.85
Expected volatility		—		124	%
Risk-free interest rate		—		3.79	%
Dividend yield		—		—