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FAIR VALUE MEASUREMENTS - Assets and Liabilities Measured at Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | $ 2,875 | $ 2,654
Total liabilities | 5,205 | 7,760
Contingent Consideration [Member] | Other Current Liabilities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 2,125 | 2,009
Contingent Consideration [Member] | Other Long-Term Liabilities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 2,911 | 2,940
Interest Rate Swap [Member] | Other Long-Term Liabilities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 169 | 2,811
Certificates of Deposit [Member] | Marketable Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 2,854 | 2,654
Foreign Exchange Forward [Member] | Other Current Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 21 |
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 2,875 | 2,654
Total liabilities | 169 | 2,811
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Other Long-Term Liabilities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 169 | 2,811
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit [Member] | Marketable Securities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 2,854 | 2,654
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Other Current Assets [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total assets | 21 |
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 5,036 | 4,949
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member] | Other Current Liabilities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | 2,125 | 2,009
Fair Value, Inputs, Level 3 [Member] | Contingent Consideration [Member] | Other Long-Term Liabilities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total liabilities | $ 2,911 | $ 2,940

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