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Subsequent Events	9 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	13. Subsequent Events Amendment to CpG 1018 Adjuvant Supply Agreement with Valneva In October 2021, we entered into a letter agreement (the “Valneva Amendment”), amending the Valneva Supply Agreement. Under the Valneva Amendment, we and Valneva agreed to the cancellation of the two then outstanding purchase orders for CpG 1018 adjuvant under the Valneva Supply Agreement that had not been fulfilled as of the date of the Valneva Amendment and that we are entitled to retain the advance payments made by Valneva under such cancelled purchase orders which total approximately $36.4 million.

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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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