Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity (Public Offerings) (Details)

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Stockholders' equity (Public Offerings) (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Stockholders' equity [Abstract]    
Shares issued during period   11,500,000
Shares issued during period, price per share   $ 1.25
Value of shares issued during period   $ 14,400,000
Cost of shares issued during period   1,405,000
Placement fee percentage   7.00%
Warrants, number of shares per warrant   0.35
Warrants, number of shares   4,025,000
Exercise price of warrants 1.36 1.36
Underwriter, addtional shares purchased   15.00%
Shares issued for warrants exercised 1,161,570  
Value of shares issued for warrants exercised $ 1,580,000