401(k) Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Minimum employee eligibility age (years)	18 years
Employer contributions to 401(k) plan	$ 400,000	$ 500,000	$ 0