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Legal Proceedings | 12 Months Ended
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Dec. 31, 2019
Legal Proceedings [Abstract] |
Legal Proceedings | 9. Legal Proceedings From time to time, we are involved in legal proceedings arising in the ordinary course of our business. Periodically, we evaluate the status of each legal matter and assess our potential financial exposure. If the potential loss from any legal proceeding is considered probable and the amount can be reasonably estimated, we accrue a liability for the estimated loss. Significant judgment is required to determine the probability of a loss and whether the amount of the loss is reasonably estimable. The outcome of any proceeding is not determinable in advance. As a result, the assessment of a potential liability and the amount of accruals recorded are based only on the information available to us at the time. As additional information becomes available, we reassess the potential liability related to the legal proceeding, and may revise our estimates. In November 2019, a purported stockholder of Akcea filed an action in the Delaware Court of Chancery, captioned City of Cambridge Retirement System v. Crooke, et al., C.A. No. 2019-0905, or the Delaware Action. The plaintiff in the Delaware Action asserts claims against (i) current and former members of Akcea’s Board of Directors, and (ii) Ionis, or collectively, the Defendants. The plaintiff asserts derivative claims on behalf of Akcea, which is a nominal defendant in the Delaware Action, as well as putatively direct claims on behalf of a purported class of Akcea stockholders. The plaintiff in the Delaware Action asserts that the Defendants breached their fiduciary duties in connection with the licensing transaction that Akcea and Ionis entered into regarding TEGSEDI and AKCEA-TTR-LRx. The plaintiff also asserts an unjust enrichment claim against Ionis. We and Akcea have moved to dismiss the plaintiff’s complaint. We believe that the claims asserted in the Delaware Action are without merit.

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- Definition The entire disclosure for legal proceedings, legal contingencies, litigation, regulatory and environmental matters and other contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 + Details
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