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CONVERTIBLE NOTES AND OTHER DEBTS - Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
2022 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Contractual interest expense | $ 1,511 | $ 1,648 | $ 953
Amortization of debt discount | 0 | 685 | 373
Amortization of debt issuance costs | 257 | 214 | 117
Total interest expense recognized | 1,768 | 2,547 | 1,443
2024 Notes |  |  |
Debt Instrument [Line Items] |  |  |
Contractual interest expense | 2,312 | 2,312 | 2,310
Amortization of debt discount | 0 | 4,718 | 4,358
Amortization of debt issuance costs | 874 | 641 | 595
Total interest expense recognized | $ 3,186 | $ 7,671 | $ 7,263

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1F -Subparagraph (b)(2) -URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495355-112611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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