Income Taxes - Income Tax (Recovery) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed taxes (recoveries) at Canadian federal and provincial tax rates	$ (4,095)	$ 3,385	$ 3,098
Tax attributes expired/utilized	2,851	2,011	198
Change in valuation allowance	2,482	(2,364)	(2,029)
Investment tax credits earned	(1,220)	(1,283)	(529)
Non-deductible expenditures	977	(1,053)	(374)
Changes in tax rates			(1,019)
Financing fees in equity		(1,945)
Other	$ (995)	$ 1,249	$ 655