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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, 2019 | 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 | $ 0 | $ 157 |
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 |  |  | (2,617)
Fair value adjustment of contingent consideration |  |  | $ (157)

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