Annual report pursuant to Section 13 and 15(d)

Stock Option Plan (Details)

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Stock Option Plan (Details) - Employee Stock Option [Member]
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rate, Minimum 1.54% 1.78%
Risk-free interest rate, Maximum 1.95% 2.19%
Expected dividend yield 0.00% 0.00%
Expected volatility 60.00% 60.00%
Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life 5 years 3 months 22 days 5 years 3 months 22 days
Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected life 6 years 3 months 6 years 3 months