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Restructuring	9 Months Ended
	Sep. 30, 2020
Restructuring And Related Activities [Abstract]
Restructuring	13. Restructuring On May 23, 2019, we implemented a strategic organizational restructuring, principally to align our operations around our vaccine business and significantly curtail further investment in our immuno-oncology business. In connection with the restructuring, we reduced our workforce by approximately 80 positions, or approximately 36%, of U.S.-based personnel. Also, in connection with the restructuring, our Chief Executive Officer, also a member of the Board of Directors (the “Board”), retired from the Company and the Board, effective August 1, 2019. During the three months ended September 30, 2019, we identified certain long-lived assets installed at the Horton Street Premises that were or would be disposed of by the Subtenant. We recorded accelerated depreciation charges of $3.0 million on these assets. For the nine months ended September 30, 2019, we recognized restructuring charges of $12.7 million, of which $5.6 million was related to severance and other termination benefits $4.1 million was related to stock-based compensation expense as a result of accelerated vesting of stock awards and the extension of exercise period of stock options and $3.0 million was related to accelerated depreciation. At December 31, 2019, we have completed our restructuring activities and all of restructuring costs totaling $13.4 million have been incurred.

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- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-URI http://asc.fasb.org/topic&trid=2175745

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