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Significant Components of Company's Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets    
Operating loss carryforward $ 9,066 $ 8,933
Accrued expenses 1,165 706
Temporary differences related to R&D expenses 1,052 922
Equity-based compensation 2,625 2,563
Tax credit carry forward 875 800
Other 529 273
Total gross deferred tax assets 15,312 14,197
Valuation allowance (12,740) (11,930)
Net deferred tax assets 2,572 2,267
Deferred tax liabilities    
Intangible assets 915 1,843
Other 29 26
Total deferred tax liabilities 944 1,869
Net deferred tax assets $ 1,628 $ 398