Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deposits for inventory	$ 1,664	$ 2,207
Subsidiary bank trust deposits	539	626
Marketing events	518	525
Insurance	314	309
Software licensing fees	278	220
R&D equipment service agreements	163	220
Dues and subscriptions	96	151
Other	314	856
Total prepaid expenses and other	$ 3,886	$ 5,114