Significant Components of Company's Deferred Tax Assets (Detail) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets
Operating loss carryforward		$ 9,638	$ 9,066
Accrued expenses		1,128	1,165
Temporary differences related to R&D expenses		1,435	1,052
Equity-based compensation		2,685	2,625
Tax credit carry forward		1,237	875
Other		562	529
Total gross deferred tax assets		16,685	15,312
Valuation allowance		(13,780)	(12,740)
Net deferred tax assets		2,905	2,572
Deferred tax liabilities
Intangible assets		621	915
Other		32	29
Total deferred tax liabilities		653	944
Net deferred tax assets	[1]	$ 2,252	$ 1,628

[1] Net deferred taxes for the years ended December 31, 2015 and 2016 are all from foreign jurisdictions.