Stock-Based Compensation - Employee Stock Purchase Plan (Details) - Shares available for issuance under the 2018 Employee Stock Purchase Plan	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term (in years)	6 months	6 months
Expected volatility	64.20%	76.60%
Risk-free interest rate	5.40%	5.20%
Expected dividend yield	0.00%	0.00%