CONVERTIBLE NOTES PAYABLE - Schedule of Interest Expense (Details) - Senior Notes - Senior Notes Due 2025 - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Contractual interest expense	$ 1,725	$ 1,725	$ 5,175	$ 5,175
Amortization of debt discount	2,609	2,417	7,680	7,115
Amortization of debt issuance costs	226	225	677	674
Total interest expense for the 2025 Notes	$ 4,560	$ 4,367	$ 13,532	$ 12,964

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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