Stock-Based Compensation - Summary of Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Granted	0			0	0	0	2,527,000
2018 Stock Plan and 2021 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Beginning Balance	3,738,000	4,165,000	4,165,000		4,165,000	4,165,000
Number of Options, Forfeited	(129,000)	(427,000)
Number of Options, Ending Balance	3,609,000	3,738,000	4,165,000		3,738,000	3,609,000		4,165,000
Number of Options, Exercisable options as of September 30, 2025	2,567,000					2,567,000
Weighted-Average Exercise Price, Beginning Balance	$ 1.77	$ 1.9	$ 1.9		$ 1.9	$ 1.9
Weighted-Average Exercise Price, Forfeited	3.36	3.07
Weighted-Average Exercise Price, Ending Balance	1.71	$ 1.77	$ 1.9		$ 1.77	1.71		$ 1.9
Weighted-Average Exercise Price, Exercisable options as of September 30, 2025	$ 1.13					$ 1.13
Weighted Average Remaining Contractual Life (Years), Balance	5 years 8 months 19 days	6 years 1 month 28 days	6 years 6 months					6 years 8 months 26 days
Weighted Average Remaining Contractual Life (years), Exercisable options as of September 30, 2025	4 years 9 months 21 days
Aggregate Intrinsic Value	$ 1,796	$ 993	$ 1,414		$ 993	$ 1,796		$ 2,445
Aggregate Intrinsic Value, Exercisable options as of September 30, 2025	$ 1,796					$ 1,796