Share Capital - Impact on Results of Operations of Recording RSU Compensation Expense (Detail) (RSU's [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted stock unit compensation expense	$ 14	$ 15	$ 43	$ 15
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted stock unit compensation expense	5	6	16	6
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Restricted stock unit compensation expense	$ 9	$ 9	$ 27	$ 9