Stock Plans (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule of stock-based compensation expense
Share-based Compensation	$ 755,000	$ 957,000
Allocated Share-based Compensation Expense	755,000	957,000
Restricted Stock Awards
Schedule of stock-based compensation expense
Share-based Compensation	439,000	666,000
Service-based restricted stock [Member] | Restricted Stock Awards
Schedule of stock-based compensation expense
Share-based Compensation	433,000	648,000
Performance-based restricted stock [Member] | Restricted Stock Awards
Schedule of stock-based compensation expense
Share-based Compensation	6,000	18,000
Cost of revenue
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	251,000	273,000
Selling, General and Administrative Expenses
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	255,000	497,000
Research and development [Member]
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	$ 249,000	$ 187,000