Significant Components of Company's Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Deferred tax assets
Operating loss carryforward	$ 8,544		$ 8,498
Accrued expenses	490		414
Temporary differences related to R&D expenses	1,045		992
Equity-based compensation	2,085		1,435
Other	774		639
Total gross deferred tax assets	12,938		11,978
Valuation allowance	(8,526)		(8,735)
Net deferred tax assets	4,412		3,243
Deferred tax liabilities
Other	73		200
Total gross deferred tax liabilities	73		200
Net deferred tax assets	$ 4,339	[1]	$ 3,043	[1]

[1] Net deferred tax for the year ended December 31, 2012 from domestic and foreign jurisdictions was $1,851 and $1,192, respectively. Net deferred tax for the year ended December 31, 2013 from domestic and foreign jurisdictions was $2,999 and $1,340, respectively.