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LEASES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Sep. 30, 2023 | May 01, 2023 | Dec. 31, 2022
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease right-of-use assets |  | $ 1,806 | $ 1,300 | $ 137
Noncurrent operating lease liabilities |  | 1,679 | $ 1,300 | 0
Lessee, operating lease, discount rate |  |  | 7.41% |
Gain on early termination of sublease | $ 600 |  |  |
Current operating lease liabilities |  | 970 |  | $ 401
Spectrum Pharmaceuticals, Inc. |  |  |  |
Lessee, Lease, Description [Line Items] |  |  |  |
Operating lease right-of-use assets |  | 400 |  |
Noncurrent operating lease liabilities |  | 300 |  |
Current operating lease liabilities |  | $ 700 |  |

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- Definition Amount of gain (loss) on termination of lease before expiration of lease term. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479092/842-20-40-1 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479041/842-20-45-1 + Details
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