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LEASES - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 USD ($) item | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |  |  |
Right-of-use assets | $ 750,000 | $ 335,000 | $ 519,000
Lease liabilities | $ 750,000 | 317,000 |
Accumulated deficit |  | (71,564,000) | (60,939,000)
Operating leases |  | 200,000 | 200,000
Right-of-use assets obtained in exchange for operating lease obligations |  | 0 | 750,000
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability |  | $ 29,000 | 0
Minimum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Facility leases | item | 1 |  |
Renewal term | 1 year |  |
Maximum |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Current prepaid expense |  |  | $ 100,000
Renewal term | 5 years |  |
ASU 2016-02 |  |  |
Lessee, Lease, Description [Line Items] |  |  |
Increase (decrease) in deferred rent and prepaid expenses | $ (6,000) |  |
Current prepaid expense | 6,000 |  |
Accumulated deficit | $ 0 |  |

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- Definition Number of options to renew under the operating leases. + References No definition available. + 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 No definition available. + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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