Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Property Plant And Equipment [Line Items]
Land	$ 286		$ 282
Building and leasehold improvements	2,531		1,988
Furniture, fixture and office equipment	5,326		5,067
Machinery	10,297		9,789
Software	2,058	[1]	1,812	[1]
Total	20,498		18,938
Accumulated depreciation	(11,661)	[2]	(10,046)	[2]
Property and equipment, net	$ 8,837		$ 8,892	[3]

[1] Amounts shown as of September 30, 2013 are net of $0.2 million for software, which was impaired during the third quarter of 2013 due to a determination that it was no longer usable

[2] Amounts shown as of September 30, 2013 in accumulated depreciation are net of reversal of accumulated depreciation totaling $ 50,000 related to assets impaired during the third quarter of 2013 as mentioned above

[3] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2012 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.