Quarterly report pursuant to Section 13 or 15(d)

Warrants (Details)

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Warrants (Details) - $ / shares
6 Months Ended
Feb. 07, 2007
Jun. 30, 2015
Class of Warrant or Right [Line Items]    
Right to purchase one share of common stock, per common share   $ 11.41
Warrants expiration date   Feb. 06, 2014
Warrant [Member]    
Class of Warrant or Right [Line Items]    
Shares issued during period 945,594