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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Sep. 30, 2020 | 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 | $ 597,800 |  |  |
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 | AdvantageTec |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Re-measurement to fair value increase (decrease) | $ 132 | $ (263) | $ 300 |

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