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Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deferred tax assets:    
Accrued liabilities not currently deductible $ 434 $ 476
Intangible assets- excess of financial statement over tax amortization 3,341 5,985
Stock-based compensation 675 2,405
Federal net operating and capital losses 35,724 35,052
State, local and foreign net operating and capital loss carryforwards 5,326 3,353
Research & experimental tax and other credit carryforwards 5,421 5,184
Lease liability 426 866
Capitalized research and development 1,054  
Other 460 547
Gross deferred tax assets 52,861 53,868
Valuation allowance (51,795) (53,066)
Net deferred tax assets 1,066 802
Deferred tax liabilities:    
Intangible assets-excess of tax over financial statement amortization (1,107) (393)
Right-of-use lease asset (192) (595)
Net deferred tax liabilities $ (233) (186)
As Adjusted    
Deferred tax assets:    
Accrued liabilities not currently deductible   476
Intangible assets- excess of financial statement over tax amortization   3,245
Stock-based compensation   442
Federal net operating and capital losses   35,052
State, local and foreign net operating and capital loss carryforwards   4,552
Research & experimental tax and other credit carryforwards   5,685
Lease liability   866
Other   547
Gross deferred tax assets   50,865
Valuation allowance   (49,643)
Net deferred tax assets   1,222
Deferred tax liabilities:    
Intangible assets-excess of tax over financial statement amortization   (813)
Right-of-use lease asset   (595)
Net deferred tax liabilities   $ (186)