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Acquisitions - Sualab Co., Ltd. Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Oct. 16, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill $ 243,445   $ 113,208 $ 113,208
Sualab Co., Ltd. [Member]        
Business Acquisition [Line Items]        
Cash and cash equivalents   $ 3,691    
Current investments   9,487    
Accounts receivable   1,200    
Inventories   115    
Prepaid expenses and other current assets   252    
Property, plant, and equipment   726    
Operating lease assets   2,792    
Deferred income tax asset   3,087    
Other assets   513    
Accounts payable   (28)    
Accrued expenses   (2,633)    
Deferred revenue and customer deposits   (764)    
Operating lease liabilities   (448)    
Non-current operating lease liabilities   (2,344)    
Deferred income tax liabilities   (7,926)    
Other liabilities   (10)    
Goodwill   130,142    
Purchase price   170,602    
Sualab Co., Ltd. [Member] | Completed Technology [Member]        
Business Acquisition [Line Items]        
Intangible assets   18,300    
Sualab Co., Ltd. [Member] | In-process Technology [Member]        
Business Acquisition [Line Items]        
Intangible assets   8,200    
Sualab Co., Ltd. [Member] | Customer Relationships [Member]        
Business Acquisition [Line Items]        
Intangible assets   5,800    
Sualab Co., Ltd. [Member] | Non-compete agreements        
Business Acquisition [Line Items]        
Intangible assets   340    
Sualab Co., Ltd. [Member] | Trademarks [Member]        
Business Acquisition [Line Items]        
Intangible assets   $ 110