Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Fair Value of Financial Assets and Liabilities
Carrying amount of cash and cash equivalents and short term investments	$ 291,000
Fair value of financial assets and liabilities
Cash equivalents	291,000	$ 320,600
Marketable securities	155,444	231,428
US treasury securities
Fair value of financial assets and liabilities
Marketable securities	53,409	65,118
Corporate debt securities and commercial paper
Fair value of financial assets and liabilities
Marketable securities	102,035	166,310
Recurring \| Estimated fair value
Fair value of financial assets and liabilities
Fair value of assets	281,491	306,016
Derivative asset	690	270
Recurring \| Money market funds \| Estimated fair value
Fair value of financial assets and liabilities
Cash equivalents	97,450	71,334
Recurring \| US treasury securities \| Estimated fair value
Fair value of financial assets and liabilities
Marketable securities	53,409	65,118
Recurring \| Corporate debt securities and commercial paper \| Estimated fair value
Fair value of financial assets and liabilities
Marketable securities	102,035	166,310
Recurring \| Commercial Paper \| Estimated fair value
Fair value of financial assets and liabilities
Cash equivalents	27,907	2,984
Recurring \| Level 1 \| Estimated fair value
Fair value of financial assets and liabilities
Fair value of assets	150,859	136,452
Recurring \| Level 1 \| Money market funds \| Estimated fair value
Fair value of financial assets and liabilities
Cash equivalents	97,450	71,334
Recurring \| Level 1 \| US treasury securities \| Estimated fair value
Fair value of financial assets and liabilities
Marketable securities	53,409	65,118
Recurring \| Level 2 \| Estimated fair value
Fair value of financial assets and liabilities
Fair value of assets	129,942	169,294
Recurring \| Level 2 \| Corporate debt securities and commercial paper \| Estimated fair value
Fair value of financial assets and liabilities
Marketable securities	102,035	166,310
Recurring \| Level 2 \| Commercial Paper \| Estimated fair value
Fair value of financial assets and liabilities
Cash equivalents	27,907	2,984
Recurring \| Level 3 \| Estimated fair value
Fair value of financial assets and liabilities
Fair value of assets	690	270
Derivative asset	$ 690	$ 270

RHYTHM PHARMACEUTICALS, INC. 10-Q