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Employee Benefits	3 Months Ended
Employee Benefits	Mar. 31, 2016
Employee Benefits
Employee Benefits	15. Employee Benefits 401(k) Plan The Company has a defined contribution 401(k) plan, or the Plan, whereby eligible employees voluntarily contribute up to a defined percentage of their annual compensation. The Company matches contributions at a rate of 50% on the first 4% of employee contributions, or up to 2% of their annual compensation, and pays the administrative costs of the Plan. Employer contributions vest over four years. Total employer contributions for the three months ended March 31, 2016 and 2015 were approximately $0.2 million and $0.2 million, respectively. Defined Benefit Pension Plan In connection with the Merck API Transaction, the Company assumed an obligation associated with a defined-benefit plan for eligible employees of AFP. This plan provides benefits to the employees from the date of retirement and is based on the employee’s length of time with the Company. The calculation is based on a statistical calculation combining a number of factors that include the employee’s age, length of service, and AFPs turnover rate. The liability under the plan is based on a discount rate of 1.75% as of March 31, 2016 and December 31, 2015. The liability is included in accrued liabilities in the accompanying consolidated balance sheets. The plan is currently unfunded, and the benefit obligation under the plan was $1.7 million and $1.6 million at March 31, 2016 and December 31, 2015, respectively. The Company recorded an immaterial amount of expense under the plan for the three months ended March 31, 2016 and 2015.