Stock-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Based Compensation [Line Items]
Total stock-based compensation expense	$ 2,128	$ 1,628	$ 1,791
Cost of revenue [Member]
Stock Based Compensation [Line Items]
Total stock-based compensation expense	1,609	1,163	1,294
Selling, General and Administrative Expenses [Member]
Stock Based Compensation [Line Items]
Total stock-based compensation expense	$ 519	$ 465	$ 497