CONVERTIBLE NOTES AND CREDIT FACILITY - Carrying Amount of Debt (Details) - Convertible Debt - Senior Convertible Note - USD ($)	Jun. 30, 2020	Dec. 31, 2019	Sep. 17, 2019
Debt Instrument [Line Items]
Carrying amount of equity component	$ 39,508,000	$ 39,508,000
Aggregate principal amount	86,250,000	86,250,000	$ 86,250,000
Unamortized debt discount	(37,854,000)	(40,902,000)
Net carrying amount	$ 48,396,000	$ 45,348,000

The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Face (par) amount of debt instrument at time of issuance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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