Stock-Based Compensation - Stock Option Valuation Assumptions (Details) - Employee Stock Option - $ / shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate	4.30%	2.90%
Expected volatility factor	153.00%	134.00%
Expected option life (years)	6 years	6 years
Weighted-average fair value (in USD per share)	$ 1.41	$ 2.18