Distribution Agreement - Additional Information (Detail) $ in Thousands	1 Months Ended	3 Months Ended
	Dec. 31, 2014 USD ($) Installment	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Aug. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Marketing Agreement [Line Items]
Customer deposits		$ 21,400	$ 19,400
Distribution fee reclassified to deferred revenue		13,914	10,433
Distribution rights revenue		119
Distribution Rights
Marketing Agreement [Line Items]
Distribution fee reclassified to deferred revenue		$ 3,703	$ 3,822
Itochu Corporation Agreement
Marketing Agreement [Line Items]
Distribution agreement term	10 years
Distribution fees	$ 4,000
Number of installments | Installment	3
Remaining term of distribution agreement		8 years 6 months
Distribution rights revenue		$ 119
Itochu Corporation Agreement | Distribution Rights
Marketing Agreement [Line Items]
Distribution fee reclassified to deferred revenue		$ 4,000
Itochu Corporation Agreement | First Installment
Marketing Agreement [Line Items]
Distribution fees	$ 1,000
Customer deposits	1,000
Itochu Corporation Agreement | Second Installment
Marketing Agreement [Line Items]
Distribution fees	1,000
Customer deposits					$ 1,000
Itochu Corporation Agreement | Third Installment
Marketing Agreement [Line Items]
Distribution fees	$ 2,000
Customer deposits				$ 2,000