Stock-Based Compensation Pricing model (Tables)

12 Months Ended

Dec. 31, 2014

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The Company uses the Black-Scholes option pricing model to estimate the fair value of each option on the date of grant. The assumptions used in the Black-Scholes pricing model for options granted or exchanged during the year ended December 31, 2014 were as follows:

	Year ended December 31, 2014
Risk-free interest rate	0.06% - 1.4%
Dividend yield	—
Expected volatility	0.4	%
Expected term (in years)	0.78 - 4