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Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Deferred tax assets:    
Stock-based compensation $ 2,646 $ 3,067
Net operating loss carryforwards 9,419 8,568
Research credit carryforwards 5,570 3,890
Intangibles 58 0
Other, net 90 354
Total deferred assets 17,783 15,879
Deferred tax liabilities:    
Intangibles 0 (181)
Foreign deferred liabilities (5,811) (8,032)
Net deferred tax asset 11,972 7,666
Valuation allowance for net deferred tax assets (931) (472)
Net deferred tax asset $ 11,041 $ 7,194