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Net Loss Per Share
3 Months Ended
Mar. 31, 2012
Net Loss Per Share [Abstract]  
Earnings Per Share, Policy
Net Loss Per Share
 
Net loss per share is computed using the weighted average number of shares of common stock outstanding during the applicable period and excludes shares underlying stock options and restricted stock units because they are antidilutive.  There are no differences between basic and diluted net loss per share for all periods presented.