Significant Accounting Policies (Details 8) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Potential common shares outstanding excluded from computation of diluted loss per share	843	790
Stock Options [Member]
Potential common shares outstanding excluded from computation of diluted loss per share	765	721
RSUs [Member]
Potential common shares outstanding excluded from computation of diluted loss per share	78	69