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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)