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Summary of Significant Accounting Policies - Fair Value Measurements (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) shares | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Aggregate maximum payout amount | $ 162,500 |  |
Cash payment for contingent consideration liabilities | $ 989 | $ 0 |
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 | $ 88,000 |  | $ 84,200
Change in the fair value of contingent consideration liabilities | 2,800 | $ (100) |
Level 3 | Acquisition Without Maximum Earn-out |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration | $ 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 |  |
Volatility | Level 3 | Maximum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, measurement input | 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 |  |
Discount Rate | Level 3 | Minimum |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, measurement input | 0.016 |  |
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 |  |
Discount Rate | Level 3 | Weighted Average |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Contingent consideration liability, measurement input | 0.023 |  |

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