Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended
	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Unbilled receivables	$ 1,051,000					$ 1,051,000
Deferred contract liabilities	0					0
Deferred contract costs	0					0
Revenue	13,032,000		$ 26,722,000
Cost of revenue	16,289,000		21,735,000
Value of notes with customer	10,613,000					$ 7,896,000
Secured Promissory Note
Disaggregation Of Revenue [Line Items]
Value of notes with customer	$ 3,700,000				$ 10,000,000.0
Term of the notes	9 months				3 years
Monthly principal and interest payments	$ 400,000				$ 300,000
Frequency of payments					monthly
Product
Disaggregation Of Revenue [Line Items]
Revenue		$ 12,500,000	0
Cost of revenue			0
Partially financed product sale					$ 12,500,000
Payments received from customer	7,200,000
Deferred Contract Liability
Disaggregation Of Revenue [Line Items]
Revenue	0		0
Cost of revenue	0		0
U.S. Customs and Border Protection ("CBP")
Disaggregation Of Revenue [Line Items]
Awarded contract amount				$ 10,500,000
Increase in contract amount				$ 300,000
Revenue recognized under the contract	100,000		$ 8,800,000
Unbilled receivables	1,100,000
Revenue for unsatisfied performance obligations	$ 100,000