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DEBT - Schedule of Convertible Senior Notes due in 2025 (Details) - Convertible Notes - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Notes due 2025
Debt Instrument [Line Items]
Contractual interest expense	$ 64	$ 64	$ 192	$ 278
Amortization of debt discount	1,103	1,047	3,239	4,469
Amortization of debt issuance costs	122	123	363	539
Total interest cost recognized	1,289	1,234	3,794	5,286
Notes due 2028
Debt Instrument [Line Items]
Amortization of debt discount	0	4,929	0	11,412
Amortization of debt issuance costs	327	235	969	550
Total interest cost recognized	327	5,164	969	11,962
Notes due 2026
Debt Instrument [Line Items]
Amortization of debt discount	0	5,650	0	13,023
Amortization of debt issuance costs	502	404	1,489	943
Total interest cost recognized	$ 502	$ 6,054	$ 1,489	$ 13,966

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