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Fair Value Measurements - Contingent consideration (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 19, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Change in fair value        
Change in fair value of acquisition-related contingent consideration expense   $ 700 $ 1,176  
Cognify, Inc        
Change in fair value        
Change in fair value of acquisition-related contingent consideration expense   700 $ 900  
Contingent consideration liability   $ 11,500   $ 10,800
Cognify, Inc | Maximum        
Change in fair value        
Estimated fair value of contingent consideration $ 14,000