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Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Jan. 31, 2018
Goodwill and intangible assets        
Goodwill   $ 57,375 $ 57,304  
Data Sciences International, Inc. (DSI) [Member]        
Recognized Identifiable Assets Acquired and Liabilities Assumed [Abstract]        
Tangible assets       $ 34,010
Liabilities assumed       (11,949)
Net assets       22,061
Goodwill and intangible assets        
Goodwill       21,865
Amortizable intangible assets       40,318
Deferred tax, net       (13,120)
Total goodwill and intangible assets, net of tax       49,063
Acquisition purchase price       71,124
Tangible assets and liabilities assumed, as referenced above, preliminarily consist of the following:        
Cash acquired       2,576
Accounts receivable, net       5,069
Inventories       11,512
Other current assets       810
Property, plant and equipment, net       3,574
Deferred income tax assets, net       10,469
Tangible assets       34,010
Accounts payable and accrued liabilities       6,001
Deferred revenue including customer advances       2,976
Other long term liabilities       2,972
Liabilities assumed       11,949
Business Acquisitions Pro Forma Revenue $ 30,071      
Business Acquisitions Pro Forma Net Income Loss $ (2,168)      
Trade Names [Member] | Data Sciences International, Inc. (DSI) [Member]        
Goodwill and intangible assets        
Amortizable intangible assets       3,524
Developed Technology [Member] | Data Sciences International, Inc. (DSI) [Member]        
Goodwill and intangible assets        
Amortizable intangible assets       25,570
Customer Relationships [Member] | Data Sciences International, Inc. (DSI) [Member]        
Goodwill and intangible assets        
Amortizable intangible assets       9,837
In-process research and development [Member] | Data Sciences International, Inc. (DSI) [Member]        
Goodwill and intangible assets        
Amortizable intangible assets       $ 1,387