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Employment Benefits	12 Months Ended
Employment Benefits	Dec. 31, 2018
Employment Benefits [Abstract]
Employment Benefits	8. Employment Benefits We have an employee 401(k) salary deferral plan, covering all employees. Employees could make contributions by withholding a percentage of their salary up to the IRS annual limit $18,500 and $24,500 in 2018 for employees under 50 years old and employees 50 years old or over, respectively. We made approximately $5.7 million, $3.0 million and $1.7 million in matching contributions for the years ended December 31, 2018, 2017 and 2016, respectively.