Revenue Recognition - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Cost of sales			$ 39,970,000	$ 46,059,000
Value of notes with customer			184,000	3,472,000
Cost of revenue			64,403,000	64,381,000
Revenue			34,136,000	45,847,000
Deferred contract costs			0	0
Cost of revenue recognized from deferred contract cost			0	27,000
Deferred Revenue
Disaggregation Of Revenue [Line Items]
Deferred contract liabilities			200,000	0
Deferred Contract Liability
Disaggregation Of Revenue [Line Items]
Revenue			0	200,000
U.S. Customs and Border Protection U.S. Border Patrol
Disaggregation Of Revenue [Line Items]
Awarded contract amount	$ 10,700,000
Increase in contract amount	$ 300,000
Revenue recognized under the contract			300,000
Revenue for unsatisfied performance obligations			$ 10,400,000
Secured Promissory Note
Disaggregation Of Revenue [Line Items]
Value of notes with customer		$ 10,000,000.0
Term of the notes		3 years
Monthly principal and interest payments		$ 300,000
Frequency of payments		monthly	monthly
Shipping and Handling
Disaggregation Of Revenue [Line Items]
Cost of sales			$ 300,000	$ 500,000
Product
Disaggregation Of Revenue [Line Items]
Partially financed product sale		$ 12,500,000
Cost of revenue		0
Revenue		$ 0
Payments received from customer			$ 4,600,000