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Acquisitions - Asset Acquisition (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 18, 2019
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]      
Consideration transferred   $ 850 $ 0
IPR&D      
Business Acquisition [Line Items]      
Consideration transferred $ 900    
Future payments for asset acquisition 100    
Expected repayment time period   18 months  
Payments for asset acquisition $ 1,000