Description of Business and Significant Accounting Policies - Summary of Current and Non-current Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Inventory Disclosure [Abstract]
Raw materials	$ 1,183	$ 1,004
Finished goods	1,547	1,569
Inventories	$ 2,730	$ 2,573