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
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Potentially dilutive securities of common stock 4.6 4.4