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Acquisitions - Preliminary Allocation of purchase price (Details) - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended
Aug. 23, 2018
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]        
Goodwill   $ 82,341 $ 82,341 $ 82,341
Goodwill adjustment   18,000    
Agilis        
Finite-Lived Intangible Assets [Line Items]        
Total consideration $ 533,681      
Cash and cash equivalents 328 328 328  
Prepaid expenses and other current assets 181 181 181  
Fixed assets 153 153 153  
Other assets 38 38 38  
Accounts payable and accrued expenses (3,828) (3,828) (3,828)  
Deferred tax liability (115,200) (122,032) (122,032) (122,000)
Deferred tax liability adjustment     (6,832)  
Fair value of net assets acquired 361,672 451,340 451,340  
Fair value of net assets acquired adjustment     89,668  
Goodwill 100,309 82,341 82,341 $ 82,300
Goodwill adjustment     (17,968)  
Total purchase price 461,981 533,681 533,681  
Total purchase price adjustment     71,700  
In Process Research and Development [Member] | Agilis        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets $ 480,000 $ 576,500 576,500  
Intangibles adjustment     $ 96,500