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Acquisition (Details Narrative)
£ in Thousands, $ in Thousands
Dec. 22, 2017
GBP (£)
Dec. 22, 2017
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 22, 2017
GBP (£)
Accrued earn-out liability included in accrued expenses and other current liabilities     $ 58,521 $ 55,040  
Accrued earn-out liability included in other long-term liabilities     6,671 $ 7,338  
Provista Technology [Member]          
Initial purchase price net of cash acquired   $ 4,500      
Accrued earn-out liability   $ 1,400      
Contingent consideration to be paid throughout the earn out period     1,400    
Accrued earn-out liability included in accrued expenses and other current liabilities     500    
Accrued earn-out liability included in other long-term liabilities     $ 900    
Provista Technology [Member] | GBP [Member]          
Initial purchase price net of cash acquired | £ £ 3,400        
Accrued earn-out liability | £         £ 1,100