Reconciliation of Actual Income Tax Expenses (Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Expense (benefit) for U.S federal income tax at statutory rate	$ 477	$ (4,849)
Effect of foreign income taxes	(101)	(47)
Research and experimentation tax credit	(812)	(320)
State income taxes, net of federal income tax benefit	(161)	(23)
Nondeductible expenses	105	33
Resolution of prior years’ tax matters	14	(657)
Change in valuation allowance	964	(4,237)
Impact on deferred taxes due to change in tax rate		8,116
Difference in U.S. tax rate from assumed rate		511
Change in fair value of contingent consideration	(444)
Foreign income tax withholding	2,358	11
Disallowance of stock compensation adjustments in excess of book	31	895
Other items	(14)	(13)
Income tax expense	$ 2,417	$ (580)
Effective tax rate	106.40%	2.90%