XML 26 R20.htm IDEA: XBRL DOCUMENT
v3.24.3

Investments in Debt Securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2024
Debt Securities [Abstract] |
Summary of Investments in Debt Securities in Condensed Consolidated Balance Sheet | The following tables summarize the Company’s investments in debt securities and their presentation in the condensed consolidated balance sheet:
|  | September 30, 2024 |  |  | December 31, 2023 |
|  | (in thousands) |
Money market funds |  | $ | 6,436 |  |  | $ | 24,273 |
Corporate paper and notes |  |  | 294,729 |  |  |  | 146,415 |
U.S. government agency securities |  |  | 91,567 |  |  |  | 39,456 |
U.S. treasuries |  |  | 47,308 |  |  |  | 21,571 |
Total |  | $ | 440,040 |  |  | $ | 231,715 |
Fair value of debt securities |  | $ | 440,718 |  |  | $ | 231,945 |
|  | September 30, 2024 |  |  | December 31, 2023 |
|  | (in thousands) |
Cash equivalents |  | $ | 90,150 |  |  | $ | 24,273 |
Current marketable securities |  |  | 199,270 |  |  |  | 150,130 |
Non-current marketable securities |  |  | 150,620 |  |  |  | 57,312 |
Total |  | $ | 440,040 |  |  | $ | 231,715 |

X
- Definition Investments in debt securities held to maturity balance sheet presentation. + References No definition available. + Details
Name: | mrus_InvestmentsInDebtSecuritiesHeldToMaturityBalanceSheetPresentationTableTextBlock
Namespace Prefix: | mrus_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_DebtSecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration