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Fair Value Measurements - Summary of Changes in the Fair Value of the Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Fair value adjustment of contingent consideration $ 157 $ (179) $ 157 $ (290)
NLEX [Member] | Contingent Consideration [Member]        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Beginning balance     2,774  
Payment of contingent consideration     (1,000)  
Fair value adjustment of contingent consideration     (157)  
Ending balance $ 1,618   $ 1,618