LEASES- Additional Information (Details) $ in Thousands	12 Months Ended
	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