Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies (Anti-Dilutive Securities) (Details)

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Summary of Significant Accounting Policies (Anti-Dilutive Securities) (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total 7,526 9,691
Options to purchase common stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total 5,117 8,287
Restricted stock units [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total 2,149 1,138
Warrants to purchase common stock [Member]
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Total 260 266