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Deferred Revenue and Performance Obligation (Notes)
 9 Months Ended
Sep. 30, 2021
Deferred Revenue and Performance Obligation [Abstract]  
Deferred revenue and performance obligation [Text Block] Deferred Revenue and Performance Obligations
    Deferred Revenue

    For the three months ended September 30, 2021 and 2020, the Company recognized approximately $43.3 million and $45.3 million, respectively, and for the nine months ended September 30, 2021 and 2020, the Company recognized approximately $86.0 million and $107.2 million, respectively, of revenue that was included in the deferred revenue balances at the beginning of the respective periods and primarily related to subscription services, maintenance and support, and services.

    Performance Obligations

     As of September 30, 2021, the Company expects to recognize approximately $373.0 million of revenue from remaining performance obligations. The Company expects, based on the terms of the related, underlying contractual arrangements, to recognize revenue on approximately $180.5 million of these performance obligations over the next 12 months, with the balance recognized thereafter. However, as a result of uncertain economic conditions caused by COVID-19, the amount of revenue recognized from the Company's contractual remaining performance obligations could vary and be less than what the Company expects as revenue recognized could be delayed or not occur depending on the ongoing impact of COVID-19.