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Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Accrued liabilities not currently deductible | $ 651 | $ 381
Intangible assets- excess of financial statement over tax amortization | 982 | 139
Goodwill recognized on financial statements in excess of tax amortization | (18) | 601
Stock-based compensation | 2,524 | 2,033
Federal net operating and capital losses | 21,531 | 3,499
State, local and foreign net operating and capital loss carryforwards | 12,325 | 7,133
Research & experimental tax and other credit carryforwards | 4,640 | 4,129
Lease liability | 1,250 | 1,899
Other | 735 | 912
Gross deferred tax assets | 44,620 | 20,726
Valuation allowance | (43,314) | (19,126)
Net deferred tax assets | 1,306 | 1,600
Deferred tax liabilities: |  |
Intangible assets-excess of tax over financial statement amortization | (532) | (1,044)
Right-of-use lease asset | (930) | (1,537)
Net deferred tax liabilities | $ (156) | $ (981)

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