Share Capital - Impact on Results of Operations of Recording Stock Based Compensation Expense (Detail) (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]
Stock-based compensation expense before income taxes	$ 165	$ 122	$ 1,107	$ 264
Related income tax benefits	0	0	0	0
Stock-based compensation, net of income taxes	165	122	1,107	264
Research and Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	98	77	682	171
Selling, General and Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	67	45	425	90
Discontinued Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense before income taxes	$ 0	$ 0	$ 0	$ 3