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DEBT - New Senior Secured Credit Facility (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 | Apr. 29, 2019 | Dec. 31, 2018 | Dec. 21, 2017
Debt Instrument [Line Items] |  |  |  |
Outstanding debt |  |  | $ 55,000,000 |
Debt interest rate |  |  | 5.96% |
Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment potential aggregate increase amount |  |  |  | $ 50,000,000
Letter of Credit | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitments from lender |  |  |  | 15,000,000
Outstanding debt |  |  | $ 2,700,000 |
Debt interest rate | 1.50% |  | 1.75% |
Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitments from lender |  | $ 100,000,000 |  | $ 100,000,000
Debt interest rate | 3.30% |  |  |
Default rate percentage | 2.00% |  |  |
Revolving Credit Facility | Line of Credit | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.00% |  |  |
Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.50% |  |  |
Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 3.00% |  |  |
Revolving Credit Facility | Line of Credit | Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 0.50% |  |  |
Revolving Credit Facility | Line of Credit | Prime Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.50% |  |  |
New Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding debt | $ 48,800,000 |  |  |
New Credit Facility | Revolving Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount |  | 50,000,000 |  |
New Credit Facility | Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding debt | 8,000,000 |  |  |
2019 Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment potential aggregate increase amount |  | $ 75,000,000 |  |
2019 Credit Facility | Letter of Credit | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding debt | $ 5,400,000 |  |  |
2019 Credit Facility | Revolving Credit Facility | Line of Credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Default rate percentage | 2.00% |  |  |
2019 Credit Facility | Revolving Credit Facility | Line of Credit | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 2.00% |  |  |
2019 Credit Facility | Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.50% |  |  |
2019 Credit Facility | Revolving Credit Facility | Line of Credit | London Interbank Offered Rate (LIBOR) | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 3.00% |  |  |
2019 Credit Facility | Revolving Credit Facility | Line of Credit | Base Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 0.50% |  |  |
2019 Credit Facility | Revolving Credit Facility | Line of Credit | Prime Rate | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 0.50% |  |  |

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