Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Shares [Rollforward]    
Balance at December 31, 2011 1,146,046  
Granted 710,345  
Exercised (46,799)  
Forfeited (83,374)  
Cancelled (13,481)  
Balance at September 30, 2012 1,712,737 1,146,046
Exercisable at September 30, 2012 781,738  
Options vested and expected to vest as of September 30, 2012 1,712,737  
Weighted Average Exercise Price [Roll Forward]    
Balance at December 31, 2011 $ 14.61  
Granted $ 14.73  
Exercised $ 9.96  
Forfeited $ 10.69  
Cancelled $ 39.73  
Balance at September 30, 2012 $ 14.84 $ 14.61
Exercisable at September 30, 2012 $ 16.58  
Options vested and expected to vest as of September 30, 2012 $ 14.77  
Weighted Average Remaining Contractual Term in Years Beginning balance   7 years 11 months 16 days
Exercisable at September 30, 2012, Weighted Average Remaining Contractual Term in Years 7 years 1 month 6 days  
Options vested and expected to vest as of September 30, 2012, Weighted Average Remaining Contractual Term in Years 8 years 1 month 21 days  
Aggregate Intrinsic Value, Ending balance   $ 1,489
Exercisable at September 30, 2012, Aggregate Intrinsic Value 2,983  
Options vested and expected to vest as of September 30, 2012, Aggregate Intrinsic Value $ 6,729