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Deferred Warranty Revenue and Warranty Reserve - Schedule of Warranty Activity (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Standard Product Warranty Disclosure [Abstract]
Balance, beginning of period	$ 45	$ 36	$ 61
Provision for warranty claims	216	139	59
Product or cash issued to settle claims	(145)	(130)	(84)
Balance, end of period	$ 116	$ 45	$ 36

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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