Employee Benefit Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Employee 401(k) Plan
Matching contribution by employer per dollar of contribution by participant	25.00%
Maximum contribution by employer (as a percent)	4.00%
Contribution by employer	$ 28,000	$ 27,000
Minimum age for contribution of an additional amount of salary per year by participants	50 years
Minimum
Employee 401(k) Plan
Contribution by participating employee (as a percent)	1.00%
Maximum
Employee 401(k) Plan
Contribution by participating employee (as a percent)	25.00%