Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018	Apr. 30, 2020	Oct. 01, 2019	Jun. 03, 2019	Sep. 30, 2017
Schedule Of Accounting Policies [Line Items]
Indefinite-Lived intangible assets other than goodwill	$ 0								$ 0
Changes in Goodwill									24,945,000	$ 34,604,000
Amortization of intangible assets									7,744,000	4,531,000	$ 3,433,000
2021	8,371,000								8,371,000
2022	7,993,000								7,993,000
2023	7,980,000								7,980,000
2024	7,976,000								7,976,000
2025	7,967,000								$ 7,967,000
Likelihood percentage of tax benefit being recognized upon ultimate settlement									50.00%
Revenue, description of payment terms									30 to 90 days from the date of shipment or satisfaction of the performance obligation
Contingent consideration liability	27,202,000								$ 27,202,000			$ 8,068,000		$ 27,202,000
Lease Right Of Use Assets	6,336,000								6,336,000
Lease Liabilities	6,467,000								6,467,000
Noncash Capital Expenditures									236,000	108,000	294,000
Revenues	$ 64,153,000	$ 84,797,000	$ 57,296,000	$ 47,421,000	50,846,000	$ 48,440,000	$ 50,248,000	$ 51,480,000	253,667,000	201,014,000	213,571,000
Reagent Rental Arrangements [Member] | Lease Elements [Member] | Product Concentration Risk [Member] | Revenues [Member]
Schedule Of Accounting Policies [Line Items]
Revenues									$ 4,600,000	4,150,000
ASU 2016-02 [Member]
Schedule Of Accounting Policies [Line Items]
Lease Right Of Use Assets													$ 5,880,000
Lease Liabilities													$ 5,880,000
Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Contract cost, amortization period	1 year								1 year
Maximum [Member] | Financial Performance Targets [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment	$ 50,000,000								$ 50,000,000
Currency Translation Adjustment [Member]
Schedule Of Accounting Policies [Line Items]
Goodwill Period Increase									485,000	599,000
Goodwill Period Decrease									6,000	577,000
GenePOC
Schedule Of Accounting Policies [Line Items]
Goodwill acquired										34,582,000
Contingent consideration liability	20,909,000				27,202,000				20,909,000	27,202,000				$ 27,202,000
GenePOC | Maximum [Member] | Product Development Milestones [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment	14,000,000								14,000,000
GenePOC | Maximum [Member] | Product Development Milestones [Member] | On Acquisition Date [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment	20,000,000								20,000,000
GenePOC | Maximum [Member] | Financial Performance Targets [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment	50,000,000								50,000,000
GenePOC | Maximum [Member] | Product Development Milestones And Financial Performance Targets [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment	64,000,000								64,000,000
GenePOC | Maximum [Member] | Product Development Milestones And Financial Performance Targets [Member] | On Acquisition Date [Member]
Schedule Of Accounting Policies [Line Items]
Potential milestone payment	70,000,000								70,000,000
Exalenz [Member]
Schedule Of Accounting Policies [Line Items]
Goodwill acquired									24,466,000
Amortization of intangible assets									$ 1,120,000
Buildings and Improvements [Member] | Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life									18 years
Buildings and Improvements [Member] | Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life									40 years
Machinery, Equipment and Furniture [Member] | Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life									3 years
Machinery, Equipment and Furniture [Member] | Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life									10 years
Computer Equipment and Software [Member] | Minimum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life									3 years
Computer Equipment and Software [Member] | Maximum [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life									5 years
Instruments Under Customer Reagent Rental Arrangements [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful life									5 years
Leasehold Improvements [Member]
Schedule Of Accounting Policies [Line Items]
Estimated useful lives									life of the lease
Inventory Realizability Reserves [Member]
Schedule Of Accounting Policies [Line Items]
Inventory Valuation Reserves	$ 3,629,000				$ 2,441,000				$ 3,629,000	$ 2,441,000	$ 1,971,000				$ 2,059,000