Line of Credit (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	May. 31, 2015 USD ($)
Line Of Credit Facility [Line Items]
Revolving line of credit, maximum borrowing capacity	$ 20,000
Revolving line of credit, basis spread over applicable rate on default	5.00%
Quick ratio	1.25
Amount drawn from revolving line of credit		$ 3,300	$ 4,300
Repayments of revolving line of credit		$ 7,600
Line of Credit Facility, Remaining Borrowing Capacity	$ 18,500
Letter of Credit [Member]
Line Of Credit Facility [Line Items]
Revolving line of credit amount outstanding				$ 1,500
Line of Credit Facility, Remaining Borrowing Capacity	$ 18,500