Subsequent Events

12 Months Ended

Dec. 31, 2015

Subsequent Events [Abstract]

Subsequent Event

18.  Subsequent Event

Securities Litigation

In March 2016, a securities class action complaint was filed in federal district court in California against the Company related to the recently announced restatement of certain interim financial statements for the periods ending June 30, 2015 and September 30, 2015. The case, Sudunagunta v. NantKwest, Inc., et al., is currently pending before the United States District Court for the Central District of California. The complaint names the Company and certain of its current and former officers and directors, as defendants, for allegedly misrepresenting material facts and/or misleading investors regarding the errors in the Company’s financial statements related to stock-based awards to the Chairman and Chief Executive Officer and build-to-suit lease accounting related to one of the Company’s research and development and good manufacturing practices facilities, and the lack of effective internal financial controls.  The complaint alleges violations of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and Rule 10b-5 promulgated thereunder. The complaint seeks unspecified damages, costs and attorneys’ fees, and equitable/injunctive or other relief.