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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 |  |  |  |  |

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