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Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Accrued liabilities not currently deductible $ 559 $ 434
Intangible assets- excess of financial statement over tax amortization 2,096 3,341
Stock-based compensation 741 675
Federal net operating and capital losses 42,774 35,724
State, local and foreign net operating and capital loss carryforwards   5,326
Research & experimental tax and other credit carryforwards 5,612 5,421
Lease liability 416 426
Capitalized research and development 1,764 1,054
Other 337 460
Gross deferred tax assets 54,299 52,861
Valuation allowance (54,105) (51,795)
Net deferred tax assets 194 1,066
Deferred tax liabilities:    
Intangible assets-excess of tax over financial statement amortization   (1,107)
Right-of-use lease asset (404) (192)
Other (39)  
Net deferred tax liabilities $ (249) $ (233)