Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits for inventory	$ 1,262	$ 1,664
Subsidiary bank trust deposits	500	539
Marketing events	735	518
Software licensing fees	412	278
Insurance	328	314
Interest receivable from marketable securities	186	166
Dues and subscriptions	107	96
Service agreements	93	163
Other	121	148
Total prepaid expenses and other current assets	$ 3,744	$ 3,886