Stock Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of stock-based compensation expense
Share-based Compensation			$ 1,921,000	$ 1,904,000
Allocated Share-based Compensation Expense	1,166,000	946,000	1,921,000	1,904,000
Restricted Stock [Member]
Schedule of stock-based compensation expense
Share-based Compensation	723,000	646,000	1,162,000	1,313,000
Restricted Stock Unit
Schedule of stock-based compensation expense
Share-based Compensation	54,000	0	54,000	0
Service-based restricted stock [Member] | Restricted Stock [Member]
Schedule of stock-based compensation expense
Share-based Compensation	716,000	621,000	1,149,000	1,270,000
Service-based restricted stock [Member] | Restricted Stock Unit
Schedule of stock-based compensation expense
Share-based Compensation	32,000	0	32,000	0
Performance-based restricted stock [Member] | Restricted Stock [Member]
Schedule of stock-based compensation expense
Share-based Compensation	7,000	25,000	13,000	43,000
Performance-based restricted stock [Member] | Restricted Stock Unit
Schedule of stock-based compensation expense
Share-based Compensation	22,000	0	22,000	0
Cost of revenue
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	190,000	261,000	442,000	535,000
Selling, General and Administrative Expenses
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	733,000	507,000	988,000	1,004,000
Research and development [Member]
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	$ 243,000	$ 178,000	$ 491,000	$ 365,000