Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity (Stock-Based Compensation Expense) (Details)

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Stockholders' Equity (Stock-Based Compensation Expense) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of stock-based compensation expense      
Stock-based compensation $ 5,076 $ 9,431 $ 8,737
Research and Development [Member]
     
Schedule of stock-based compensation expense      
Stock-based compensation 2,334 3,311 3,352
Sales, general and administrative [Member]
     
Schedule of stock-based compensation expense      
Stock-based compensation $ 2,742 $ 6,120 $ 5,385