Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total 7,351 8,716 8,062
Options to purchase common stock [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total 6,133 7,904 7,796
Restricted stock units [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total 958 546 0
Warrants to purchase common stock [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Total 260 266 266