Reconciliation of Actual Income Tax Expenses (Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Expense (benefit) for U.S federal income tax at statutory rate	$ (3,484)	$ 477
Effect of foreign income taxes	(64)	(101)
Research and experimentation tax credit	(1,201)	(812)
State income taxes, net of federal income tax benefit	(158)	(161)
Nondeductible expenses	63	105
Resolution of prior years’ tax matters	(7)	14
Change in valuation allowance	4,882	964
Impact on deferred taxes due to change in tax rate	196
Change in fair value of contingent consideration	214	(444)
Foreign income tax withholding	1,928	2,358
Disallowance of stock compensation adjustments in excess of book	255	31
Other items	25	(14)
Income tax expense	$ 2,649	$ 2,417
Effective tax rate	(16.00%)	106.40%