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LEASES- Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) ft² | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Leases [Line Items] |  |  |
Operating lease, rent expense, net | $ 800 | $ 800 | $ 700
Operating lease, weighted-average remaining lease term | 4 years 1 month 6 days |  |
Operating lease, weighted-average discount rate | 7.20% |  |
Carrying amount of lease receivables | $ 1,600 | 2,800 |
Unguaranteed residual assets | 0 |  |
Operating lease income | $ 200 | $ 200 | $ 300
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue From Contract With Customer Excluding Assessed Tax | Revenue From Contract With Customer Excluding Assessed Tax | Revenue From Contract With Customer Excluding Assessed Tax
Property and equipment, net | $ 2,009 | $ 1,991 |
NeuroStar Advanced Therapy Systems | Minimum |  |  |
Leases [Line Items] |  |  |
Lessor sales-type lease, Term | 3 years |  |
NeuroStar Advanced Therapy Systems | Maximum |  |  |
Leases [Line Items] |  |  |
Lessor sales-type lease, Term | 4 years |  |
Headquarters and Office Equipment, Including Copiers |  |  |
Leases [Line Items] |  |  |
Area of lease facility | ft² | 32,000 |  |
Lessee, operating lease, extended maturity period | 2028-02 |  |
Additional lease facility area acquired | ft² | 10,000 |  |
Lessee, operating lease, existence of option to extend | true |  |
Combined area of lease facility | ft² | 42,000 |  |
Description of option to extend lease facility | The Company has an option to extend the lease on its combined 42,000 square foot facility for an additional five-year term |  |
Lessee, operating lease, renewal term | 5 years |  |
Rental Equipment |  |  |
Leases [Line Items] |  |  |
Property and equipment, net | $ 300 | 500 |
Rental equipment depreciation expense | $ 90 | $ 100 | $ 50
Charlotte, North Carolina |  |  |
Leases [Line Items] |  |  |
Area of lease facility | ft² | 9,600 |  |
Description of option to extend lease facility | True |  |
Lessee, operating lease, renewal term | 1 year |  |

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