Other Income - Schedule of Other Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Other Income and Expenses [Abstract]
Change in fair value of derivative liability		$ 50
Foreign exchange losses	$ (8)	(26)
Interest income	234	121
Miscellaneous expenses	(20)	(22)
Other income (expenses)	$ 206	$ 123