Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended			6 Months Ended
	Nov. 13, 2018	Jul. 27, 2018	Sep. 30, 2021	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Sep. 30, 2020
Commitments And Contingencies [Line Items]
Contingent earn-out liability				$ 7,720		$ 7,720		$ 10,962
Change in estimated fair value of contingent consideration				(221)	$ 972	(918)	$ 972
Future minimum lease obligations				$ 1,472		$ 1,472
Maximum
Commitments And Contingencies [Line Items]
Operating lease term				7 years		7 years
Quantum
Commitments And Contingencies [Line Items]
Contingent earn-out liability		$ 7,700
Contingent payments earn-out period		4 years
Contingent payments earn-out period ending month and year		2022-07
Contingent payments maximum earn-out amount		$ 23,500
Contingent earn-out liability								5,800
Change in estimated fair value of contingent consideration						$ 800
Estimated fair value of earn-out liability				$ 5,000		5,000
Contingent earn-out cash payment								100
Quantum | Scenario Forecast
Commitments And Contingencies [Line Items]
Contingent earn-out additional payment			$ 2,300
Optoseis Technology
Commitments And Contingencies [Line Items]
Contingent earn-out liability	$ 4,300
Contingent payments earn-out period	5 years 6 months
Contingent payments earn-out period ending month and year	2024-05
Contingent payments maximum earn-out amount	$ 23,200
Contingent earn-out liability								$ 5,200
Change in estimated fair value of contingent consideration						100
Estimated fair value of earn-out liability				$ 5,100		$ 5,100