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Revenue Recognition - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Unbilled receivables | $ 4,263,000 |  |  |  |
Deferred contract costs | 0 |  |  |  | $ 0
Revenue | 26,722,000 |  |  | $ 9,083,000 |
Cost of revenue recognized from deferred contract cost | 0 |  |  | 0 |
Cost of revenue | 21,735,000 |  |  | 15,208,000 |
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 |  |  | $ 0 |  |
Partially financed product sale |  |  | 12,500,000 |  |
Cost of revenue |  |  | $ 0 |  |
Payments received from customer | $ 5,300,000 |  |  |  |
Deferred Revenue and Other Liabilities |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Deferred contract liabilities | 0 |  |  |  | 200,000
Deferred Contract Liability |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Revenue | 200,000 |  |  | $ 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 | 8,800,000 |  |  |  | $ 300,000
Unbilled receivables | 4,300,000 |  |  |  |
Revenue for unsatisfied performance obligations | $ 1,600,000 |  |  |  |

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