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Income Taxes - Significant Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Deferred tax assets:    
Stock-based compensation $ 1,864 $ 2,503
Net operating loss carryforwards 5,669 5,931
Research credit carryforwards 7,322 6,264
Lease liability 856 1,091
Intangibles 0 300
Total deferred assets 15,711 16,089
Deferred tax liabilities:    
Right of use asset (570) (726)
Foreign deferred liabilities (8,019) (5,756)
Other, net 1 (62)
Net deferred tax asset 7,123 9,545
Valuation allowance for net deferred tax assets (729) (710)
Net deferred tax asset $ 6,394 $ 8,835