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Summary of Significant Accounting Policies - Summary of Intangible Assets (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Gross Carrying Amount $ 740 $ 972
Intangible assets, Accumulated Amortization (359) (445)
Intangible assets, Net Carrying Value $ 381 527
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Useful Life 1 year 3 months  
Intangible assets, Gross Carrying Amount   237
Intangible assets, Accumulated Amortization   (228)
Intangible assets, Net Carrying Value   9
Acquired Proprietary Software    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Useful Life 5 years  
Intangible assets, Gross Carrying Amount $ 151 150
Intangible assets, Accumulated Amortization (58) (35)
Intangible assets, Net Carrying Value $ 93 115
Reacquired Rights    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Useful Life 3 years 10 months 13 days  
Intangible assets, Gross Carrying Amount $ 505 503
Intangible assets, Accumulated Amortization (250) (152)
Intangible assets, Net Carrying Value $ 255 351
Internally Developed Software    
Finite Lived Intangible Assets [Line Items]    
Intangible assets, Useful Life 3 years  
Intangible assets, Gross Carrying Amount $ 84 82
Intangible assets, Accumulated Amortization (51) (30)
Intangible assets, Net Carrying Value $ 33 $ 52