INDEBTEDNESS - Summary of interest expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Debt Disclosure [Abstract]
Interest on debt	$ 1,519	$ 1,681	$ 4,273	$ 4,829
Net revenue payments on financing arrangement	659	146	2,451	146
Paid-in-kind interest on term loans				1,590
Amortization of debt financing costs	0	359	858	637
Amortization of discount on term loans				1,657
Total	$ 2,178	$ 2,186	$ 7,582	$ 8,859

Interest Expense, Net Revenue Payments On Financing Arrangement

No definition available.

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- Definition

The interest expenses incurred for term loan.

+ References

No definition available.

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- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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- Definition

Amount of amortization expense attributable to debt issuance costs.

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- References

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- Definition

The net amount of operating interest income (expense).

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Interest paid other than in cash for example by issuing additional debt securities. As a noncash item, it is added to net income when calculating cash provided by or used in operations using the indirect method.

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