Defined Contribution Plan (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2006
Defined Contribution Plan [Abstract]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 862	$ 682	$ 565
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	90.00%			15.00%

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