Term Loan - Debt Issuance Costs and Debt Discount (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Mar. 31, 2025	Jan. 31, 2025	Dec. 31, 2024	Jun. 14, 2024	Jan. 31, 2021
Debt Instrument [Line Items]
Derivative liability	$ 29,407		$ 20,800	$ 11,100
Proceeds from convertible notes offering, net of issuance costs	72,813	$ 0
2024 Term Loan
Debt Instrument [Line Items]
Derivative liability						$ 1,100
Debt instrument, pro-rata debt discount				$ 239
2024 Term Loan \| Line of Credit
Debt Instrument [Line Items]
Derivative liability	$ 1,100						$ 2,100
Effective interest rate (as percent)	15.20%				16.00%
2024 Term Loan \| Convertible Debt
Debt Instrument [Line Items]
Proceeds from convertible notes offering, net of issuance costs	$ 23,000

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Heartflow, Inc. 10-Q