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Acquisitions, Acquired Intangible Assets, and Goodwill - Intangible Assets Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]            
Net carrying amount $ 2,111,000   $ 2,111,000   $ 2,231,000 $ 408,000
Amortization expense 55,000 $ 0 171,000 $ 0 69,000  
Software development            
Acquired Finite-Lived Intangible Assets [Line Items]            
Capitalized software development costs 170,000 292,000 441,000 895,000 1,032,000 162,000
Amortization expense associated with capitalized development costs 123,000 $ 75,000 382,000 $ 179,000 305,000 182,000
Net carrying amount $ 1,093,000   $ 1,093,000   $ 1,038,000 $ 408,000