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Fair Value Measurement - Reconciliation of Beginning and Ending Balances for Level 3 Contingent Liabilities (Parenthetical) (Details) - Level 3 - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019
Initial Public Offering | Restricted Stock Units |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Issuance of restricted stock units for settlement of contingent liabilities | 89,842 |
Other Noncurrent Liabilities |  |
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items] |  |
Deferred compensation liabilities | $ 1.7 | $ 1.9

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