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Related Parties
 9 Months Ended
Sep. 30, 2021
Related Party Transactions [Abstract]  
Related Parties Related Parties For the three months ended September 30, 2021 and 2020, we received software and software maintenance services of $0.3 million and $0.2 million, respectively, from two software vendors controlled by our largest stockholder. For the nine months ended September 30, 2021 and 2020, we received software and software maintenance services of $0.9 million and $0.7 million, respectively from these vendors. Amounts due to these vendors were immaterial as of September 30, 2021 and December 31, 2020.