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Stock Plans (Details) (USD $)	3 Months Ended
Stock Plans (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	$ 957,000	$ 1,286,000
Share-based Compensation	957,000	1,286,000
Restricted Stock Awards [Member]
Schedule of stock-based compensation expense
Share-based Compensation	666,000	542,000
Service-based restricted stock [Member] \| Restricted Stock Awards [Member]
Schedule of stock-based compensation expense
Share-based Compensation	648,000	479,000
Performance-based restricted stock [Member] \| Restricted Stock Awards [Member]
Schedule of stock-based compensation expense
Share-based Compensation	18,000	63,000
Cost of revenue [Member]
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	273,000	142,000
Selling, General and Administrative Expenses [Member]
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	497,000	962,000
Research and development [Member]
Schedule of stock-based compensation expense
Allocated Share-based Compensation Expense	$ 187,000	$ 182,000

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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