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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2018
Recurring | Convertible senior note          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Convertible senior note net $ 905,800   $ 905,800    
Conversable, Inc. and AdvntageTec          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent earn-out         $ 2,400
Contingent earn-out          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Contingent earn-out increase (decrease)   $ 100   $ 600  
Equity issued as payment for contingent consideration       (300)  
Contingent earn-out from acquisition $ 6,000        
Contingent earn-out | AdvantageTec          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Re-measurement to fair value increase (decrease)     132 (263)  
Contingent earn-out from acquisition     $ 6,026 $ 0