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Company Overview - STL Acquisition (Details) - USD ($)
$ in Thousands
1 Months Ended 9 Months Ended
May 29, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Cash paid for business acquisition     $ 4,081 $ 0
STL        
Business Acquisition [Line Items]        
Controlling interest acquired, ownership percentage 70.00%      
Total Consideration for business acquisition $ 5,100      
Cash paid for business acquisition $ 4,100      
Other payment for business acquisition   $ 1,000    
Redeemable noncontrolling interests, ownership percentage 30.00%      
Redeemable noncontrolling interests recognized $ 3,400      
Intangible assets recognized $ 2,400      
Goodwill recognized     $ 6,900