Accounts Receivable and Sales Concentrations - Summary of Activity in the Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Receivables [Abstract]
Balance at Beginning of Year	$ 520	$ 445	$ 311
Additions	208	208	177
Write- offs	(8)	(123)	(47)
Currency Impacts	(36)	(10)	4
Balance at End of Year	$ 684	$ 520	$ 445