Components of Net Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Components Of Deferred Tax Assets And Liabilities [Line Items]
Operating loss carryforwards	$ 25,881	$ 21,753
Tax credit carryforwards	400	317
Other temporary differences	4,302	2,921
Deferred Tax Assets, Gross, Total	30,583	24,991
Less valuation allowance	(30,583)	(24,991)
Net deferred tax asset