Quarterly report pursuant to Section 13 or 15(d)

Warrants (Details)

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Warrants (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Feb. 07, 2007
Class of Warrant or Right [Line Items]    
Right to purchase one share of common stock, per common share $ 11.41corr_ClassofWarrantorRightRighttoPurchaseShareofCommonStockPerCommonShare  
Warrants expiration date Feb. 06, 2014  
Warrant [Member]    
Class of Warrant or Right [Line Items]    
Shares issued during period   945,594us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember