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Fair Value Measurements - Summary of Changes in the Fair Value of the Contingent Consideration Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value adjustment of contingent consideration | $ 157 | $ (938)
NLEX [Member] | Contingent Consideration [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Beginning balance | 2,774 | 2,733
Payment of contingent consideration | (2,617) | (897)
Fair value adjustment of contingent consideration | $ (157) | 938
Ending balance |  | $ 2,774

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