Stock-based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Summary of Stock Option Activity

The following table summarizes stock option activity for the year ended December 31, 2023:

	Shares			Weighted Average Exercise Price		Weighted Average Remaining Contractual Life
Outstanding as of December 31, 2022		35,715		$	475.74		7.32
Granted		—			—
Exercised		—			—
Expired		(3,281	)		336.80
Forfeited / cancelled		(6,346	)		387.49
Outstanding as of December 31, 2023		26,088		$	514.72		6.64
Vested and exercisable as of December 31, 2022		16,494		$	378.40		5.71
Vested and exercisable as of December 31, 2023		16,861		$	468.68		5.70

Summary of Weighted Average Assumptions Used in Calculation of Fair Value Using Black-Scholes Option Pricing Model

The grant date fair value of stock options granted during the year ended December 31, 2022 was estimated at the time of grant using the Black-Scholes option-pricing model and utilized the following assumptions:

	May 20, 2022			May 9, 2022
Fair value of common stock (per share)	$	91.20		$	66.40
Expected term (in years)	10			10
Risk-free interest rate		2.78	%		3.05	%
Expected volatility		100.00	%		100.00	%
Dividend yield	—%			—%

Summary of Activity for Restricted Stock Units

The following table summarizes restricted stock unit ("RSUs") activity for the year ended December 31, 2023:

	Shares			Weighted Average Grant Date Fair Value per Share
Unvested and outstanding as of December 31, 2022		108,268		$	259.37
Granted		110,365			73.10
Vested and released		(20,278	)		468.31
Forfeited / cancelled		(23,089	)		213.51
Outstanding as of December 31, 2023		175,266		$	124.33
Vested and exercisable		(1,152	)		84.80
Unvested and outstanding as of December 31, 2023		174,114		$	124.59