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Acquisitions - Sualab Co., Ltd. Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Oct. 16, 2019
Dec. 31, 2018
Business Acquisition [Line Items]        
Goodwill $ 244,078 $ 243,445   $ 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     129,138  
Purchase price     169,598  
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