Summary of Significant Accounting Policies - Additional information (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Depreciation		$ 910	$ 868
Goodwill impairment	$ 4,800
Goodwill		58	58
Advertising expense		$ 400	500
Pension Plan
Property, Plant and Equipment [Line Items]
Minimum year of service		60 days
Recognized costs		$ 200	$ 100
Wireless
Property, Plant and Equipment [Line Items]
Goodwill		$ 100
Accounts Receivable | Telco | Customer Concentration Risk | One Customer
Property, Plant and Equipment [Line Items]
Concentration risk, percentage		31.00%
Accounts Receivable | Wireless | Customer Concentration Risk | One Customer
Property, Plant and Equipment [Line Items]
Concentration risk, percentage		28.00%
Minimum
Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life		3 years
Maximum
Property, Plant and Equipment [Line Items]
Finite-lived intangible asset, useful life		10 years
Software and Software Development Costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		3 years
Office Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		5 years
Warehouse and Service Equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		7 years
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life		10 years