Segment Information - Net Sales by Campaign Target Area (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 31,416	$ 29,972
Customers by Campaign Target Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	31,416	29,972
North America [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	19,881	20,278
North America [Member] | Customers by Campaign Target Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	19,881	20,278
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	11,535	9,694
International [Member] | Customers by Campaign Target Area [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 11,535	$ 9,694