Registration statement for securities of certain foreign private issuers

Equity (Details)

v3.19.1
Equity (Details) - Ordinary Shares [Member] - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement Line Items [Line Items]      
Number of shares authorized 80,000,000 80,000,000  
Number of shares issued and outstanding 33,295,618 28,156,728 28,119,728