401(k) Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Percent of company match	50.00%
Percent of employees' annual compensation contributed, maximum	6.00%
Matching contributions to the plan	$ 521	$ 424	$ 562