Warranties - Schedule of Warranty Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Standard Product Warranty Disclosure [Abstract]
Balance, beginning of period	$ 91	$ 46	$ 116	$ 45
Provision for claims	17	35	68	66
Product or cash issued to settle claims	(49)	(47)	(125)	(77)
Balance, end of period	$ 59	$ 34	$ 59	$ 34