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Consolidated Balance Sheets (Parenthetical)
12 Months Ended
Mar. 19, 2015
Dec. 31, 2015
Dec. 31, 2014
Statement of Financial Position [Abstract]      
Reverse stock split ratio 0.2 0.2 0.2
Reverse stock split description   1-for-5  
Effective date of reverse stock split   Mar. 19, 2015 Mar. 19, 2015