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DEBT - Narrative (Details) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 08, 2018 USD ($) bank | Jun. 30, 2019 USD ($) | Jun. 30, 2019 EUR (€) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |
Amortization of principal, percent | 12.50% |  |  |
Credit agreement, number of banks | bank | 3 |  |  |
Debt issuance costs |  | $ 698,000 |  | $ 773,000
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 | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 1.50% |  |
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 | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 3.00% |  |
Credit Facility | Alternate currencies revolving loan | Maximum | Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 2.00% |  |
Credit Facility | Capital expenditure facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | $ 25,000,000 |  |  |
Credit Facility | German bank line of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Maximum borrowing capacity | € |  |  | € 4,000,000 |
Available borrowing capacity | € |  |  | € 1,478,000 |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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