401(k) SAVINGS PLAN

12 Months Ended

Dec. 31, 2015

Compensation And Retirement Disclosure [Abstract]

401(k) SAVINGS PLAN

7. 401(k) SAVINGS PLAN

The Company sponsors a 401(k) plan covering substantially all United States employees. The plan is a defined contribution savings plan in which employees may contribute up to 87% of their salary, subject to certain limitations. The Company may elect to make discretionary contributions into the Plan. The Company contributed $0.5 million to this plan during each of the years ended December 31, 2015, 2014 and 2013.