Quarterly report pursuant to Section 13 or 15(d)

Stockholders' equity (Subsequent Events) (Details)

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Stockholders' equity (Subsequent Events) (Details) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2013
May 12, 2014
Subsequent Event [Member]
Subsequent Event [Line Items]    
Shares issued during period 11,500,000 8,335,000
Shares issued during period, price per share $ 1.25 $ 2.40
Value of shares issued during period $ 14,400,000 $ 20,000,000
Cost of shares issued during period 1,405,000 1,640,000
Placement fee percentage 7.00% 6.50%
Common stock options exercised, shares   15,342
Weighted-average exercise price per share, exercised   $ 2.10
Options exercised   $ 32,000