Acquisition of Business of GenePOC - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Jun. 03, 2019	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	May 24, 2019
Contingent consideration liability		$ 27,200,000	$ 27,200,000
Goodwill			$ 89,241,000	$ 54,637,000	$ 54,926,000
Goodwill Tax Deductable Period			15 years
Acquisition-related Costs			$ 1,808,000
Amortization of identifiable assets			4,531,000	$ 3,433,000	$ 3,776,000
Financial Performance Targets [Member] | Maximum [Member]
Potential milestone payment			50,000,000
Product Development Milestone A [Member]
Potential milestone payment			$ 10,000,000
Milestone measurement date			Sep. 30, 2020
Product Development Milestone B [Member]
Potential milestone payment			$ 10,000,000
Milestone measurement date			Mar. 31, 2021
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 125,000,000
GenePOC Inc [Member]
Maximum Business Combination Consideration		$ 120,000,000
Assets acquired liabilities assumed net	$ 77,526,000
Contingent consideration liability			$ 27,200,000
Cash payment to acquire business	50,000,000
Business Combination Closing Payment Holdback	5,000,000		5,000,000
Goodwill	34,582,000
Net revenues from the GenePOC business			341,000
Net loss from the GenePOC business			3,848,000
Amortization of identifiable assets			1,204,000
Non cash acquisition consideration payable			32,200,000
GenePOC Inc [Member] | Financial Performance Targets [Member] | Maximum [Member]
Potential milestone payment			50,000,000
GenePOC Inc [Member] | Operating Expense [Member]
Acquisition-related Costs			$ 1,808,000
GenePOC Inc [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 125,000,000