Employee Benefit Plan ( Details) (USD $)	1 Months Ended	12 Months Ended
Jan. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Employee Benefit Plan
Employee maximum contribution percentage	100.00%
Employer discretionary contribution amount	$ 0	$ 0	$ 0

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

No definition available.

Name:	us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration