Subsequent Events	6 Months Ended
Jun. 30, 2022
Subsequent Events [Abstract]
Subsequent Events	12. Subsequent Events In July 2022, the Company entered into a clinical supply agreement with AstraZeneca (LSE/STO/Nasdaq: AZN) for Tagrisso (osimertinib), a third-generation EGFR-TKI, for a planned investigation of the combination of Tagrisso and MCLA-129 in patients with non-small cell lung cancer in the dose expansion phase of the trial. Under the terms of the non-exclusive agreement, AstraZeneca will supply Tagrisso for use by the Company in the combination study. At this time the Company is still in process of determining the financial impact of the agreement.

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI https://asc.fasb.org/topic&trid=2122774

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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