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Shareholders' Equity (Details 5) (Restricted Stock Units (RSUs) [Member], USD $)
9 Months Ended
Sep. 30, 2012
Restricted Stock Units (RSUs) [Member]
 
Summary of Restricted Stock Unit activity  
Unvested, Number of shares, Beginning Balance 241,248
Unvested, Weighted Average Grant Date Fair Value, Beginning Balance $ 6.20
Granted, Number of shares 177,592
Granted, Weighted Average Grant Date Fair Value $ 3.49
Vested, Number of shares (95,103)
Vested, Weighted Average Grant Date Fair Value $ 4.97
Forfeited, Number of shares (26,019)
Forfeited, Weighted Average Grant Date Fair Value $ 6.28
Unvested, Number of shares, Ending Balance 297,718
Unvested, Weighted Average Grant Date Fair Value, Ending Balance $ 4.97
Expected to vest, Number of shares, Ending Balance 268,879
Expected to vest, Weighted Average Grant Date Fair Value, Ending Balance $ 4.88