Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Cash and Cash Equivalents (Narrative) (Details)

v3.8.0.1
Cash and Cash Equivalents (Narrative) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial assets [line items]    
Annual interest rate for deposits 1.50%  
Bottom of range [Member]    
Disclosure of financial assets [line items]    
Annual interest rate for deposits   0.75%
Top of range [member]    
Disclosure of financial assets [line items]    
Annual interest rate for deposits   1.25%