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Summary of Significant Accounting Policies - Fair Value Measurements (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) shares | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Aggregate maximum payout amount | $ 148,500 |  | $ 148,500 |  |
Change in fair value of contingent consideration liabilities | (2,238) | $ 4,371 | 520 | $ 4,287 |
Cash payment for contingent consideration liabilities | 10,000 |  | $ 11,000 |  |
Shares transferred in settlement of contingent consideration liabilities (in shares) | shares |  |  | 4,277 |  |
Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration | 75,800 |  | $ 75,800 |  | $ 84,200
Level 3 | Acquisition Without Maximum Earn-out |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration | $ 1,000 |  | $ 1,000 |  |
Volatility | Level 3 | Minimum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.204 |  | 0.204 |  |
Volatility | Level 3 | Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.300 |  | 0.300 |  |
Volatility | Level 3 | Weighted Average |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.226 |  | 0.226 |  |
Discount Rate | Level 3 | Minimum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.002 |  | 0.002 |  |
Discount Rate | Level 3 | Maximum |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.039 |  | 0.039 |  |
Discount Rate | Level 3 | Weighted Average |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Contingent consideration liability, measurement input | 0.021 |  | 0.021 |  |

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