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Employee Benefit Plans
12 Months Ended
Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
14. Employee Benefit Plans
The Company has established two voluntary defined contribution retirement plans qualifying under Section 401(k) of the Internal Revenue Code. The Company made no contributions to the 401(k) plans for the years ended December 31, 2016, 2015, and 2014.