401 (K) PLAN	12 Months Ended
Dec. 31, 2018
Compensation And Retirement Disclosure [Abstract]
401 (K) PLAN	17. 401 (K) PLAN The Company sponsors a 401 (k) Plan (“the Plan”) which is a defined contribution plan. It is available to all employees who are age 21 or older. Participants may make voluntary contributions and the Company makes matching contributions according to the Plan’s matching formula. Matching contributions fully vest after one year of service for all employees. The expense related to the Plan primarily consists of the Company’s matching contributions. Expense related to the Plan totaled $2.1 million, $1.4 million and $1.2 million for the years ended December 31, 2018, 2017 and 2016, respectively.

401 (K) PLAN

12 Months Ended

Dec. 31, 2018

Compensation And Retirement Disclosure [Abstract]

17. 401 (K) PLAN

The Company sponsors a 401 (k) Plan (“the Plan”) which is a defined contribution plan. It is available to all employees who are age 21 or older. Participants may make voluntary contributions and the Company makes matching contributions according to the Plan’s matching formula. Matching contributions fully vest after one year of service for all employees. The expense related to the Plan primarily consists of the Company’s matching contributions.

Expense related to the Plan totaled $2.1 million, $1.4 million and $1.2 million for the years ended December 31, 2018, 2017 and 2016, respectively.