Fair Value Measurements - Liabilities (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Fair Value Measurements
Acquisition-related contingent consideration - long-term	$ 11,400	$ 10,800
Level 3
Fair Value Measurements
Acquisition-related contingent consideration - long-term	$ 11,400	$ 10,800

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