SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 74,890	$ 71,348	$ 65,206
Product Category | U.S. | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 72,488	$ 69,336	$ 63,406
Percentage of Revenues	100.00%	100.00%	100.00%
Product Category | U.S. | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 15,267	$ 16,460	$ 16,575
Percentage of Revenues	21.00%	24.00%	26.00%
Product Category | U.S. | Revenue | Treatment sessions
Segment Reporting Information [Line Items]
Revenues	$ 50,832	$ 50,896	$ 45,077
Percentage of Revenues	70.00%	73.00%	71.00%
Product Category | U.S. | Revenue | Clinic revenue
Segment Reporting Information [Line Items]
Revenues	$ 4,445
Percentage of Revenues	6.00%
Product Category | U.S. | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 1,944	$ 1,980	$ 1,754
Percentage of Revenues	3.00%	3.00%	3.00%
Product Category | International | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 2,402	$ 2,012	$ 1,800
Percentage of Revenues	100.00%	100.00%	100.00%
Product Category | International | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 826	$ 629	$ 811
Percentage of Revenues	34.00%	31.00%	45.00%
Product Category | International | Revenue | Treatment sessions
Segment Reporting Information [Line Items]
Revenues	$ 613	$ 754	$ 354
Percentage of Revenues	26.00%	38.00%	20.00%
Product Category | International | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 963	$ 629	$ 635
Percentage of Revenues	40.00%	31.00%	35.00%