13.Restructuring Charges

In September 2016, we announced that we had reduced our workforce by 46 positions, mostly in the research area.  We also announced that effective September 15, 2016, Donald G. Payan, M.D, retired from the board of directors and from his position as Executive Vice President and President of Discovery and Research. We recorded restructuring charges during the third quarter of 2016 of approximately $5.8 million, which included $5.0 million of severance costs paid in cash, $319,000 impairment of certain property and equipment, and $499,000 of non-cash stock-based compensation expense as a result of the modification of our former executive’s stock options. At September 30, 2017, the remaining accrued restructuring cost of $64,000 related to COBRA benefits is classified under Accrued Compensation in the Condensed Balance Sheet.