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Lease Exit Liability | 12 Months Ended
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Dec. 31, 2017
Restructuring and Related Activities [Abstract] |
Lease Exit Liability | Lease Exit Liability In 2008, the Company acquired Raven Biotechnologies, Inc. (Raven), a private South San Francisco-based company focused on the development of monoclonal antibody therapeutics for treating cancer. The Company undertook restructuring activities related to the acquisition of Raven. In connection with these restructuring activities, as part of the cost of acquisition, the Company established a restructuring liability attributed to an existing operating lease. During the year ended December 31, 2016, the Company entered into an agreement to sublease a portion of the space subject to this operating lease. The Company will receive approximately $1.3 million in sublease payments over its term, which ends at the same time as the original lease in February 2018. No sublease income was contemplated when the restructuring liability was recorded in 2008; therefore, the Company adjusted the liability to reflect the future sublease income during the year ended December 31, 2016 and recorded an offset to research and development expense of approximately $1.3 million in the same period. Changes in the lease exit liability are as follows (in thousands):
Accrual balance at December 31, 2015 | $ | 4,713 |
Principal payments and other adjustments | (2,822 | )
Accrual balance at December 31, 2016 | 1,891 |
Principal payments and other adjustments (net of sublease receipts) | (1,593 | )
Accrual balance at December 31, 2017 | $ | 298 |
During 2015, the Company corrected an immaterial error attributed to the estimated lease term that resulted in a reduction of research and development expense of $1.9 million.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -URI http://asc.fasb.org/topic&trid=2175745 + Details
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