Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Schedule of stock-based compensation expense    
Stock-based compensation $ 1,472 $ 1,169
Research and development [Member]
   
Schedule of stock-based compensation expense    
Stock-based compensation 527 653
Sales, general and administrative [Member]
   
Schedule of stock-based compensation expense    
Stock-based compensation $ 945 $ 516