Financial Risk Management (Tables)

12 Months Ended

Dec. 31, 2018

Financial Risk Management [Abstract]

Disclosure of detailed information about sales percentage from significant customer [Text Block]

The Company depends on two customers for majority of its revenues. The Company’s sales to these two customers as a percentage of revenues are as follows:

	Year Ended December 31,
	2017			2018

Customer A and its affiliates		25.8	%		28.1	%
Customer B and its affiliates		15.5	%		12.6	%

Disclosure of detailed information about Accounts receivable Percentage from significant customers [Text Block]

The percentage of the Company’s accounts receivable accounted by customers, those representing more than 10% of total accounts receivable balance, is summarized as follows:

	January 1,			December				December
	2017				31, 2017			31, 2018

Customer A and its affiliates		28.9	%			32.4	%		33.5	%
Customer B and its affiliates		19.1	%			15.4	%		12.9	%