Registration statement for securities of certain foreign private issuers

Share-Based Payment Transactions (Details 2)

v3.19.1
Share-Based Payment Transactions (Details 2) - Binomial option pricing model [Member] - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]    
Dividend yield 0.00% 0.00%
Contractual life 10 years 10 years
Early Exercise Multiple (Suboptimal Factor) $ 2.5 $ 2.5
Bottom of range [Member]    
Statement Line Items [Line Items]    
Risk-free interest rate 1.89% 2.01%
Expected volatility 74.40% 77.84%
Exercise price $ 0.72 $ 1.12
Top of range [Member]    
Statement Line Items [Line Items]    
Risk-free interest rate 2.31% 2.02%
Expected volatility 77.64% 78.22%
Exercise price $ 0.98 $ 1.39