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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