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Fair Value Measurements - Changes in Level 3 Instruments (Details) - Recurring - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in the Company's Level 3 instruments measured at fair value    
Beginning balance $ 1,500 $ 0
Contingent consideration on acquisition 0 1,443
Contingent consideration paid, SlimCut acquisition (1,500) 0
Mark-to-market expense 0 57
Ending balance $ 0 $ 1,500