Commitments and Contingencies - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Jun. 30, 2019	Jun. 03, 2019
Commitments Contingencies And Litigation [Line Items]
Annual royalty expenses	$ 2,107,000	$ 2,579,000	$ 2,600,000
2020	14,203,000
2021 - 2024	792,000
Thereafter	0
Expenses under operating leases	2,372,000	2,457,000	$ 2,140,000
2020	1,528,000
2021	1,451,000
2022	1,293,000
2023	967,000
2024	712,000
Payments for indemnifications	0	0
Liabilities for indemnifications	0	$ 0
Contingent consideration liability	27,200,000			$ 27,200,000
GenePOC
Commitments Contingencies And Litigation [Line Items]
Business Combination Closing Payment Holdback	5,000,000				$ 5,000,000
Contingent consideration liability	27,200,000
Maximum [Member] | GenePOC
Commitments Contingencies And Litigation [Line Items]
Potential milestone and holdback payment	75,000,000
Maximum [Member] | GenePOC | Product Development Milestones And Financial Performance Targets [Member]
Commitments Contingencies And Litigation [Line Items]
Potential milestone payment	$ 70,000,000
Diagnostics [Member]
Commitments Contingencies And Litigation [Line Items]
Percentage of total royalty expense	84.00%
Diagnostics [Member] | Minimum [Member]
Commitments Contingencies And Litigation [Line Items]
Percentage of royalty payable	3.00%
Diagnostics [Member] | Maximum [Member]
Commitments Contingencies And Litigation [Line Items]
Percentage of royalty payable	8.00%