Income Taxes - Schedule of Income tax Recovery (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Computed taxes at combined Canadian and U.S. tax rates	$ (5,997)	$ (6,561)	$ (2,235)
Change in Canadian tax rate	26		(364)
Non-deductible expenses	446	185	94
Investment tax credits			(5)
Change in valuation allowance	$ 5,525	4,519	2,500
Reversal of tax benefit related to taxable preferred stock		1,685
Other impact upon conversion of taxable preferred stock		$ 172	5
Income tax recovery			$ (5)