Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes Disclosure [Line Items]
Expected Canadian income tax rate	26.00%
Expected U.S. income tax rates	35.00%
Combined Canadian and US expected income tax rates	27.40%	27.30%	25.60%
Uncertain tax position	Less than a 50%
Unrecognized tax benefits	$ 0
Income tax examination, description	The Company currently files income tax returns in the United States and Canada, the jurisdictions in which the Company believes that it is subject to tax. Further, while the statute of limitations in each jurisdiction where an income tax return has been filed generally limits the examination period, as a result of loss carry-forwards, the limitation period for examination generally does not expire until several years after the loss carry-forwards are utilized. Other than routine audits by tax authorities for tax credits and tax refunds that the Company has claimed, management is not aware of any other material income tax examination currently in progress by any taxing jurisdiction.
Minimum [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards, expiration dates	2026
Maximum [Member]
Income Taxes Disclosure [Line Items]
Operating loss carryforwards, expiration dates	2035
Preferred Stock [Member]
Income Taxes Disclosure [Line Items]
Accrued non-current tax payable on preferred stock	$ 0	$ 0
Domestic Tax Authority [Member]
Income Taxes Disclosure [Line Items]
Net operating losses carried forward for tax purposes	7,140,000	4,009,000
CANADA | Foreign Tax Authority [Member]
Income Taxes Disclosure [Line Items]
Net operating losses carried forward for tax purposes	70,316,000	53,302,000
Tax deductions for scientific research and experimental development	$ 10,532,000	10,532,000
CANADA | Foreign Tax Authority [Member] | Minimum [Member]
Income Taxes Disclosure [Line Items]
Taxes payable, expiration dates	2019
CANADA | Foreign Tax Authority [Member] | Maximum [Member]
Income Taxes Disclosure [Line Items]
Taxes payable, expiration dates	2033
CANADA | Foreign Tax Authority [Member] | Investment Tax Credit Carryforward [Member]
Income Taxes Disclosure [Line Items]
Investment tax credits available to offset Canadian federal	$ 2,698,000	$ 2,698,000