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LONG-TERM DEBT - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 11, 2018 | Jan. 03, 2017 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt discount |  |  | $ 3,263,000 |  | $ 3,263,000 |  | $ 3,300,000
Undrawn commitment for a letter of credit |  |  | 100,000 |  | 100,000 |  |
Payment-in-kind interest |  |  |  |  | 2,479,000 | $ 2,407,000 |
Interest expense |  |  | 10,776,000 | $ 7,630,000 | 20,139,000 | 14,559,000 |
Amortization related to amortization of deferred finance costs and debt discounts |  |  | 400,000 | $ 300,000 | 800,000 | 700,000 |
Goldman Sachs Specialty Lending Group | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 422,500,000 |  | $ 422,500,000 |  |
Interest rate during period |  |  | 10.50% |  | 10.50% |  | 10.50%
Goldman Sachs Specialty Lending Group | Line of Credit | Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 397,500,000 |  | $ 397,500,000 |  |
Remaining borrowing capacity |  |  | 80,000,000.0 |  | 80,000,000.0 |  |
Payment-in-kind interest |  |  |  |  | 2,500,000 | $ 2,400,000 |
Goldman Sachs Specialty Lending Group | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  | 25,000,000.0 |  | 25,000,000.0 |  |
Line of credit |  |  | $ 14,000,000.0 |  | $ 14,000,000.0 |  |
Interest rate during period |  |  | 7.40% |  | 7.40% |  |
Syndicate of Lenders | Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Interest rate during period |  |  | 7.41% |  | 7.41% |  | 7.53%
Quarterly principal payment |  | $ 1,000,000.0 |  |  |  |  |
Syndicate of Lenders | Line of Credit | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable margin |  |  |  |  | 5.00% |  | 5.00%
Syndicate of Lenders | Line of Credit | Term Loan | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable margin | 5.00% |  |  |  |  |  |
Syndicate of Lenders | Line of Credit | Term Loan | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable margin | 4.00% |  |  |  |  |  |
Syndicate of Lenders | Line of Credit | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit |  |  |  |  |  |  | $ 0
Unused commitment fee percentage | 0.50% |  |  |  |  |  |
Syndicate of Lenders | Line of Credit | Revolving Credit Facility | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable margin | 5.00% |  |  |  |  |  |
Syndicate of Lenders | Line of Credit | Revolving Credit Facility | Base Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Applicable margin | 4.00% |  |  |  |  |  |
Delayed Draw | Goldman Sachs Specialty Lending Group | Line of Credit | Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  | 70,000,000.0
Debt discount |  |  |  |  |  |  | $ 350,000
Unused commitment fee amount |  |  | $ 400,000 |  |  |  |

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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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