Income Taxes - Components of Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Sep. 30, 2019
Deferred tax assets:
Stock-based compensation	$ 2,503	$ 2,646
Net operating loss carryforwards	5,931	9,419
Research credit carryforwards	6,264	5,570
Lease liability	1,091
Intangibles	300	58
Other, net	0	90
Total deferred assets	16,089	17,783
Deferred tax liabilities:
Right of use asset	(726)
Foreign deferred liabilities	(5,756)	(5,811)
Other, net	(62)	0
Net deferred tax asset	9,545	11,972
Valuation allowance for net deferred tax assets	(710)	(931)
Net deferred tax asset	$ 8,835	$ 11,041