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Stockholders' equity (Summary of Weighted Average Assumptions Used In Black Scholes Option Pricing Model) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Equity [Abstract]
Expected life	5 years	5 years
Risk-free interest rate	1.75%	0.74%
Expected volatility	60.30%	72.80%

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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