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CONVERTIBLE NOTES - Summary of Interest Expense (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Feb. 29, 2020	Mar. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Disclosure [Abstract]
Debt issuance costs amortization			$ 1,444	$ 1,443	$ 4,284	$ 3,860
Debt discount amortization			37	37	110	94
Loss on settlement of convertible notes	$ 50,800	$ 187,700	0	0	0	50,819
Coupon interest expense			2,566	2,567	7,699	7,065
Total interest expense on convertible notes			4,047	4,047	12,093	61,838
Other interest expense			633	431	1,855	1,544
Total interest expense			$ 4,680	$ 4,478	$ 13,948	$ 63,382

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The amount of coupon interest expense.

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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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Amount of amortization expense attributable to debt issuance costs.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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