Quarterly report pursuant to Section 13 or 15(d)

Basic and Diluted Net Loss per Common Share - Additional Information (Details)

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Basic and Diluted Net Loss per Common Share - Additional Information (Details)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Potentially dilutive securities of common stock 2.8 4.4