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Stock-based Compensation - Equity Incentive Plans, Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended		6 Months Ended
	Jun. 06, 2024	Oct. 22, 2019	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Dec. 31, 2024
Stock-based compensation
Number of shares outstanding (in shares)			11,820,239	14,981,933	11,820,239	14,981,933	13,992,173	16,511,128
Stock-based compensation expense			$ 13,803	$ 11,530	$ 25,249	$ 18,274
ESPP
Stock-based compensation
Stock-based compensation expense			$ 100	$ 200	$ 200	$ 200
2019 Waystar Holding Plan
Stock-based compensation
Maximum shares issuable (in shares)		9,900,000
Contractual term		10 years
Number of shares outstanding (in shares)		2,100,000
2019 Waystar Holding Plan \| Stock Options
Stock-based compensation
Vesting period of options with a service condition		5 years
Vesting percentage of options with a service condition (in percent)		20.00%
2024 Equity Incentive Plan
Stock-based compensation
Maximum shares issuable (in shares)	10,000,000
Percentage of outstanding common stock	5.00%
Common stock, capital shares reserved for future issuance			8,000,000.0		8,000,000.0
2024 Equity Incentive Plan \| Stock Options
Stock-based compensation
Vesting period of options with a service condition	5 years
Vesting percentage of options with a service condition (in percent)	20.00%
2024 Equity Incentive Plan \| RSUs \| Share-Based Payment Arrangement, Tranche One
Stock-based compensation
Vesting period of options with a service condition	4 years
Vesting percentage of options with a service condition (in percent)	25.00%
2024 Equity Incentive Plan \| RSUs \| Share-Based Payment Arrangement, Tranche Two
Stock-based compensation
Vesting period of options with a service condition	5 years
Vesting percentage of options with a service condition (in percent)	20.00%
2024 Equity Incentive Plan \| Performance Stock Units With Market-Based Conditions
Stock-based compensation
Performance period	4 years
2024 Equity Incentive Plan \| Performance Stock Units With Market-Based Conditions \| Minimum
Stock-based compensation
Vesting percentage of options with a service condition (in percent)	0.00%
2024 Equity Incentive Plan \| Performance Stock Units With Market-Based Conditions \| Maximum
Stock-based compensation
Vesting percentage of options with a service condition (in percent)	200.00%
2024 Equity Incentive Plan \| Performance Stock Units With Performance-Based Conditions
Stock-based compensation
Vesting period of options with a service condition					3 years
Performance period	3 years				3 years
2024 Equity Incentive Plan \| Performance Stock Units With Performance-Based Conditions \| Minimum
Stock-based compensation
Vesting percentage of options with a service condition (in percent)	0.00%				0.00%
2024 Equity Incentive Plan \| Performance Stock Units With Performance-Based Conditions \| Maximum
Stock-based compensation
Vesting percentage of options with a service condition (in percent)	200.00%				200.00%
2024 Employee Stock Purchase Plan
Stock-based compensation
Percentage of outstanding common stock	1.00%
Common stock, capital shares reserved for future issuance	3,250,000
Common stock issued under employee stock purchase plan (in shares)			0	0	51,221	0
2024 Employee Stock Purchase Plan \| Maximum
Stock-based compensation
Shares available for future grant (in shares)	27,000,000
2024 Employee Stock Purchase Plan \| ESPP
Stock-based compensation
ESPP discount rate (as a percent)	15.00%