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DEBT - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 25, 2020 USD ($) | Mar. 08, 2018 USD ($) bank | Jun. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of principal, percent |  | 12.50% |  |  |  |
Credit agreement, number of banks | bank |  | 3 |  |  |  |
Debt issuance costs |  |  | $ 593,000 | $ 593,000 | $ 603,000 |
Syndicated Credit Facility Amendment | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Coverage ratio |  |  | 1.35 |  |  |
Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Credit facility, term |  | 5 years |  |  |  |
Credit Facility | Syndicated Credit Facility 2018 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 75,000,000 |  |  |  |
Accordion feature |  | 100,000,000 |  |  |  |
Credit Facility | U.S. Dollar revolving loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | 50,000,000 |  |  |  |
Credit Facility | Alternate Currencies Revolving Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | 20,000,000 |  |  |  |
Credit Facility | Alternate Currencies Revolving Loan | Minimum | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 0.50% |  |
Credit Facility | Alternate Currencies Revolving Loan | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 1.50% |  |
Credit Facility | Alternate Currencies Revolving Loan | Maximum | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 2.00% |  |
Credit Facility | Alternate Currencies Revolving Loan | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate |  |  |  | 3.00% |  |
Credit Facility | Capital expenditure facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  | $ 25,000,000 |  |  |  |
LIBOR-based variable rate |  |  | 2.49% | 2.49% |  | 2.49%
Line of credit facility, prepayment amount |  |  |  |  | $ 7,000,000 |
Credit Facility | Syndicated Credit Facility Amendment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Minimum liquidity covenant | $ 10,000,000 |  |  |  |  |
Credit Facility | Syndicated Credit Facility Amendment | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate | 0.75% |  |  |  |  |
Credit Facility | Syndicated Credit Facility Amendment | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate | 1.75% |  |  |  |  |
Credit Facility | Syndicated Credit Facility Amendment | Minimum | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate | 0.75% |  |  |  |  |
Credit Facility | Syndicated Credit Facility Amendment | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate | 1.75% |  |  |  |  |
Fixed interest rate | 0.75% |  |  |  |  |
Credit Facility | Syndicated Credit Facility Amendment | Maximum | Base Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate | 2.00% |  |  |  |  |
Credit Facility | Syndicated Credit Facility Amendment | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable interest rate | 3.00% |  |  |  |  |
Credit Facility | German Bank Line of Credit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity | € |  |  |  |  |  | € 4,000,000
Available borrowing capacity | € |  |  |  |  |  | € 243,000

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