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Business Acquisitions - Allocation of Purchase Consideration (Details) - USD ($)
$ in Thousands
Oct. 29, 2020
Sep. 30, 2021
Dec. 31, 2020
Business Combination and Asset Acquisition [Abstract]      
Cash acquired $ 5,200    
Business Acquisition [Line Items]      
Goodwill   $ 18,979 $ 18,121
OptaSense Holdings Limited      
Business Acquisition [Line Items]      
Accounts receivable 4,534    
Contract assets 1,513    
Inventory 12,793    
Other current assets 1,026    
Property and equipment 1,247    
Identifiable intangible assets 11,263    
Goodwill 8,520    
Right of use assets 2,151    
Other long-term assets 22    
Accounts payable and accrued expenses (3,925)    
Contract liabilities (3,259)    
Other current liabilities (862)    
Long-term operating lease liability (1,335)    
Total purchase consideration $ 33,688