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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 66 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 17, 2021 | Oct. 10, 2019 | Sep. 30, 2015 | Dec. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Mar. 31, 2021 | Sep. 30, 2021 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contract asset |  |  |  | $ 700,000 |  |  |  | $ 600,000 |
Contract liability |  |  |  | 4,700,000 |  |  |  | 4,600,000 |
Contract liability recognized as revenue |  |  |  | 2,100,000 |  |  |  |  |
Capitalized contract cost, amortization |  |  |  | 200,000 |  | $ 100,000 |  |  |
Interest income |  |  |  | $ 131,000 |  | $ 185,000 |  |  |
Loss on sale of financing receivable |  |  |  |  | $ 1,100,000 |  |  |  |
Cost of Goods | Contract With Commercial Client | Supplier Concentration Risk |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  | 60.50% |  | 60.00% |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Remaining performance obligation, period |  |  |  | 1 year |  |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01 | Machinio |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Remaining performance obligation |  |  |  | $ 4,700,000 |  |  |  |  |
Tanager Acquisitions Promissory Note |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Receivable with imputed interest, face amount |  |  | $ 12,300,000 |  |  |  |  |  | $ 12,300,000
Receivable with imputed interest, term |  |  | 5 years |  |  |  |  |  |
Proceeds from collection of notes receivable | $ 3,500,000 | $ 2,500,000 |  |  |  |  | $ 7,700,000 |  |
Interest income |  | $ 400,000 |  |  |  |  |  |  |
Receivable with imputed interest, net amount |  |  |  | 4,600,000 |  |  |  | 4,600,000 |
Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Contract costs |  |  |  | $ 1,700,000 |  |  |  | $ 1,600,000 |

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