Prepaid and Other Current and Non-current Assets - Schedule of Components of Other Non-current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Other Assets, Noncurrent [Abstract]
Lease and purchase options	$ 1,635	$ 1,345
Deposits related to marketing activities	654	551
Other	132	5
Total other non-current assets	$ 2,421	$ 1,901