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Revenue Recognition - Additional Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Unbilled receivables | $ 2,707,000 |  |  |  | $ 2,707,000 |  |
Deferred contract costs | 0 |  |  |  | 0 |  | $ 0
Revenue | 21,604,000 |  |  | $ 9,517,000 | 48,326,000 | $ 18,600,000 |
Cost of revenue | 23,045,000 |  |  | 18,002,000 | $ 44,780,000 | 33,210,000 |
Secured Promissory Note |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Value of notes with customer |  |  |  | $ 10,000,000.0 |  | 10,000,000.0 |
Term of the notes |  |  |  | 3 years |  |  |
Monthly principal and interest payments |  |  |  | $ 300,000 |  |  |
Frequency of payments |  |  |  | monthly | 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 |  |  |  |  | $ 6,100,000 |  |
Deferred Revenue and Other Liabilities |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Deferred contract liabilities | 0 |  |  |  | 0 |  | 200,000
Deferred Contract Liability |  |  |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |  |  |
Revenue | 0 |  |  | 0 | 200,000 | 0 |
Cost of revenue | 0 |  |  | $ 0 | 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 |  |  |  |  | 8,900,000 |  | $ 300,000
Unbilled receivables | 2,700,000 |  |  |  | 2,700,000 |  |
Revenue for unsatisfied performance obligations | $ 1,300,000 |  |  |  | $ 1,300,000 |  |

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