Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2017
Income Tax Disclosure [Line Items]
U.S. federal statutory tax rate	21.00%	21.00%		35.00%
Impact of CARES Act	$ (735,000)	$ 1,700,000
Excess tax benefits related to stock based compensation expense	900,000	400,000	$ 500,000
Deferred tax asset valuation allowance	7,253,000	6,246,000
Unrecognized tax benefits that would impact effective tax rate	2,700,000	2,700,000	2,100,000
Accrued interest and penalties on unrecognized tax benefits	400,000	600,000	$ 500,000
Undistributed earnings in foreign subsidiaries	0	$ 0
Federal [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 100,000
Net operating loss carryforwards, beginning of expiration year	Jan. 01, 2035
State [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 100,000
Net operating loss carryforwards, beginning of expiration year	Jan. 01, 2029
Ireland and Luxembourg [Member] | Creagh Medical Ltd [Member]
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	$ 4,100,000
R&D Credit Carryforwards [Member] | Federal and State [Member] | 2029 [Member]
Income Tax Disclosure [Line Items]
Tax credit carryforwards	$ 3,100,000
Tax credit carryforward, beginning of expiration year	Jan. 01, 2029