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Subsequent Event	6 Months Ended
	Jun. 30, 2024
Subsequent Events [Abstract]
Subsequent Event	Subsequent Event In July 2024, the Company and Incyte entered into an amendment to the Incyte License Agreement, pursuant to which certain milestones were deemed to have been met, resulting in $100.0 million in milestone payments to the Company. The Company received the milestone payments in August 2024. On July 26, 2024, a putative securities class action suit, entitled Crain v. MacroGenics, Inc. (Case No. 24-cv-02184), was filed in the U.S. District Court for the District of Maryland against the Company and Scott Koenig, the Company’s President, Chief Executive Officer and a member of the Company’s Board of Directors, alleging violations of securities laws during 2024. The suit asserts certain claims under Section 10 and Rule 10b-5 of the Securities and Exchange Act of 1934 based on alleged misstatements or omissions concerning the Company's TAMARACK Phase 2 study of vobramitamab duocarmazine (vobra duo) in patients with metastatic castration-resistant prostate cancer (mCRPC). The Company plans to vigorously defend against these claims. Currently, no reserve has been established for any potential liability related to this suit.

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No definition available.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483399/855-10-50-2

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