Stock Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of stock-based compensation expense
Share-based Compensation			$ 2,934,000	$ 2,622,000
Allocated Share-based Compensation Expense	1,011,000	719,000	2,934,000	2,622,000
Restricted Stock [Member]
Schedule of stock-based compensation expense
Share-based Compensation	703,000	563,000	1,854,000	1,875,000
Restricted Stock Unit
Schedule of stock-based compensation expense
Share-based Compensation	85,000	0	139,000	0
Service-based restricted stock [Member] | Restricted Stock [Member]
Schedule of stock-based compensation expense
Share-based Compensation	696,000	523,000	1,834,000	1,793,000
Service-based restricted stock [Member] | Restricted Stock Unit
Schedule of stock-based compensation expense
Share-based Compensation	51,000	0	83,000	0
Performance-based restricted stock [Member] | Restricted Stock [Member]
Schedule of stock-based compensation expense
Share-based Compensation	7,000	40,000	20,000	82,000
Performance-based restricted stock [Member] | Restricted Stock Unit
Schedule of stock-based compensation expense
Share-based Compensation	34,000	0	56,000	0
Cost of revenue
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	145,000	228,000	587,000	762,000
Selling, General and Administrative Expenses
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	716,000	332,000	1,705,000	1,337,000
Research and development [Member]
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	$ 150,000	$ 159,000	$ 642,000	$ 523,000