Geographic Information - Schedule of Sales by Geographical Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographical area	$ 6,221	$ 9,410
Central America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographical area	339	3,635
South America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographical area	884	1,618
Mexico [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographical area	1,673	1,782
U.S.-based Latin American Distributors [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographical area	$ 3,325	1,570
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographical area		793
Asia Pacific ("APAC") [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales by geographical area		$ 12