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Acquisitions - Chiaro Technologies LLC Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 30, 2016
Business Acquisition [Line Items]        
Goodwill $ 113,208 $ 113,208 $ 95,280  
Chiaro Technologies LLC [Member]        
Business Acquisition [Line Items]        
Prepaid expenses and other current assets       $ 3
Goodwill       2,911
Accrued expenses       (115)
Purchase price       4,149
Completed Technologies [Member] | Chiaro Technologies LLC [Member]        
Business Acquisition [Line Items]        
Finite-lived intangible assets       $ 1,350