Significant Components of Company's Deferred Tax Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Deferred tax assets
Operating loss carryforward	$ 8,933		$ 8,544
Accrued expenses	706		490
Temporary differences related to R&D expenses	922		1,045
Equity-based compensation	2,563		2,085
Tax credit carry forward	800		622
Other	273		152
Total gross deferred tax assets	14,197		12,938
Valuation allowance	(11,930)		(8,526)
Net deferred tax assets	2,267		4,412
Deferred tax liabilities
Other	26		73
Intangible assets	1,843
Total gross deferred tax liabilities	1,869		73
Net deferred tax assets	$ 398	[1]	$ 4,339	[1]

[1] Net deferred tax for the year ended December 31, 2013 from domestic and foreign jurisdictions was $2,999 and $1,340, respectively. Net deferred tax for the year ended December 31, 2014 from domestic and foreign jurisdictions was $0 and $398, respectively.