Accounts Receivable and Sales Concentrations - Activity in the Allowance for Doubtful Accounts (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Receivables [Abstract]
Balance at Beginning of Year	$ 311	$ 438	$ 478
Additions	177	98	140
Write- offs	(47)	(224)	(178)
Currency Impacts	4	(1)	(2)
Balance at End of Year	$ 445	$ 311	$ 438