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Subsequent Events	3 Months Ended
	Mar. 31, 2021
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events “At-the-Market” Offerings Subsequent to March 31, 2021 through May 13, 2021, the Company sold 206,593 shares of its common stock pursuant to the 2020 Sales Agreement, at an average price of approximately $4.51 per share for aggregate net proceeds of $0.9 million, after deducting commissions and other transaction costs. Milestone Event On April 13, 2021, the Company was notified by Sarepta of the achievement of the milestone event related to the completion of a non-clinical study for Duchenne muscular dystrophy and certain limb-girdle muscular dystrophies under the Company’s Research License and Option Agreement. Under the terms of the Agreement, Sarepta is obligated to pay a non-refundable, non-creditable milestone payment of $3.0 million to the Company within 60 days of Sarepta’s receipt of the related invoice from the Company. The AskBio Collaboration Agreement On April 29, 2021, the Company was notified by AskBio that it intended to opt-out of development of the MMA indication. Consequently, the Company will assume all rights to the MMA program and intends to continue to progress the MMA-101 and ImmTOR combination through clinical development.

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://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 http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662

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