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Fair Value Measurements - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Fair Value Disclosures [Abstract] |  |  |  |  |
Gain (loss) on indemnification asset | $ 540 | $ (3,736) | $ (3,878) | $ (4,646) |
Stock based compensation awards, fair value of awards outstanding | 47,900 |  | 47,900 |  | $ 60,200
Stock option liability | 37,661 |  | 37,661 |  | $ 43,026
Stock compensation expense (benefit) | $ 1,289 | $ (4,863) | $ (4,195) | $ 9,536 |

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