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Fair Value Measurements - Fair Value Measurement of Financial Assets and Liabilities on Recurring Basis (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
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NLEX [Member] | Contingent Consideration [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of liabilities | $ 2,774,000 | $ 2,733,000
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of liabilities | 0 | 0
Level 1 [Member] | NLEX [Member] | Contingent Consideration [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of liabilities | 0 | 0
Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of liabilities | 0 | 0
Level 2 [Member] | NLEX [Member] | Contingent Consideration [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of liabilities | 0 | 0
Level 3 [Member] | NLEX [Member] | Contingent Consideration [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Fair value of liabilities | $ 2,774,000 | $ 2,733,000

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