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INCOME TAXES - COMPANY'S NET DEFERRED TAX ASSETS AND LIABILITIES (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Deferred tax assets:    
Stock-based compensation $ 3,067 $ 3,671
Net operating loss carryforwards 8,568 3,453
Research credit carryforwards 3,890 3,171
AMT credit carryforwards 0 392
Foreign net operating losses 0 386
Other, net 354 770
Total deferred assets 15,879 11,843
Deferred tax liabilities:    
Intangibles (181) (393)
Foreign deferred liabilities (8,032) (280)
Net deferred tax asset 7,666 11,170
Valuation allowance for net deferred tax assets (472) (105)
Net deferred tax asset $ 7,194 $ 11,065