Benefit Plan	12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]
Benefit Plan	BENEFIT PLAN The Company maintains 401(k) retirement savings plans that allow voluntary contributions by all employees upon their hire date. Eligible employees may elect to contribute up to the maximum amount allowed under Internal Revenue Service regulations. The Company can make discretionary contributions under the 401(k) plan. During the years ended December 31, 2017, 2016 and 2015, the Company contributed approximately $2.4 million, $0.8 million, and $0.4 million, respectively, to the 401(k) Plan.

Benefit Plan

12 Months Ended

Dec. 31, 2017

BENEFIT PLAN

The Company maintains 401(k) retirement savings plans that allow voluntary contributions by all employees upon their hire date. Eligible employees may elect to contribute up to the maximum amount allowed under Internal Revenue Service regulations. The Company can make discretionary contributions under the 401(k) plan. During the years ended December 31, 2017, 2016 and 2015, the Company contributed approximately $2.4 million, $0.8 million, and $0.4 million, respectively, to the 401(k) Plan.