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Stock Plans (Details) (USD $)	3 Months Ended		9 Months Ended
Stock Plans (Details) (USD $)	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Schedule of stock-based compensation expense
Share-based Compensation			$ 2,561,000	$ 2,440,000
Allocated Share-based Compensation Expense	505,000	735,000	2,561,000	2,440,000
Restricted Stock Awards
Schedule of stock-based compensation expense
Share-based Compensation	171,000	261,000	1,179,000	876,000
Service-based restricted stock [Member] \| Restricted Stock Awards
Schedule of stock-based compensation expense
Share-based Compensation	369,000	170,000	1,216,000	635,000
Performance-based restricted stock [Member] \| Restricted Stock Awards
Schedule of stock-based compensation expense
Share-based Compensation	(198,000)	91,000	(37,000)	241,000
Cost of revenue
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	163,000	89,000	543,000	292,000
Selling, General and Administrative Expenses
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	213,000	531,000	1,586,000	1,773,000
Research and development [Member]
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	$ 129,000	$ 115,000	$ 432,000	$ 375,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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