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401(K) Plan
6 Months Ended
Jun. 30, 2019
Compensation And Retirement Disclosure [Abstract]  
401(K) Plan

11. 401(K) PLAN

The Company sponsors a 401(k) defined contribution plan covering all U.S. employees under the Internal Revenue Code of 1986, as amended. Employee contributions are voluntary and are determined on an individual basis subject to the maximum allowable under federal tax regulations. On January 1, 2018, the Company began to make contributions to the employee plan. The Company incurred expenses related to contributions to the plan of $0.1 million for each of the three months ended June 30, 2019 and 2018, respectively.  The Company incurred expenses related to contributions to the plan of $0.3 million and $0.1 million for the six months ended June 30, 2019 and 2018, respectively.