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
6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Stock option plan activity    
Weighted Average Exercise Price, Beginning balance $ 14.61  
Weighted Average Remaining Contractual Term in Years Beginning balance   7 years 11 months 16 days
Aggregate Intrinsic Value, Ending balance   $ 1,489
Granted, Shares 642,845  
Granted, Weighted Average Exercise Price $ 14.28  
Exercised, Shares (17,003)  
Exercised, Weighted Average Exercise Price $ 10.25  
Forfeited, Shares (65,927)  
Forfeited, Weighted Average Exercise Price $ 10.01  
Cancelled, Shares (12,823)  
Cancelled, Weighted Average Exercise Price $ 40.50  
Ending balance, Shares 1,693,138 1,146,046
Beginning balance, Shares 1,146,046  
Weighted Average Exercise Price, Ending balance $ 14.51 $ 14.61
Exercisable at June 30, 2012, Shares 689,860  
Exercisable at June 30, 2012, Weighted Average Exercise Price $ 16.87  
Exercisable at June 30, 2012, Weighted Average Remaining Contractual Term in Years 7 years 1 month 24 days  
Exercisable at June 30, 2012, Aggregate Intrinsic Value 2,634  
Options vested and expected to vest as of June 30, 2012, Shares 1,693,138  
Options vested and expected to vest as of June 30, 2012, Weighted Average Exercise Price $ 14.51  
Options vested and expected to vest as of June 30, 2012, Weighted Average Remaining Contractual Term in Years 8 years 4 months 6 days  
Options vested and expected to vest as of June 30, 2012, Aggregate Intrinsic Value $ 6,702