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REVENUE AND DEFERRED REVENUE - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
REVENUE AND DEFERRED REVENUE
Revenues	$ 37,297	$ 18,530	$ 107,380	$ 52,397
Product Category | U.S. | Revenues
REVENUE AND DEFERRED REVENUE
Revenues	$ 36,248	$ 17,922	$ 105,387	$ 50,845
Percentage of Revenues	100.00%	100.00%	100.00%	100.00%
Product Category | U.S. | Revenues | NeuroStar Advanced Therapy System
REVENUE AND DEFERRED REVENUE
Revenues	$ 3,508	$ 4,108	$ 9,838	$ 11,418
Percentage of Revenues	10.00%	23.00%	9.00%	22.00%
Product Category | U.S. | Revenues | Treatment sessions
REVENUE AND DEFERRED REVENUE
Revenues	$ 10,543	$ 13,326	$ 30,928	$ 37,974
Percentage of Revenues	29.00%	74.00%	30.00%	75.00%
Product Category | U.S. | Revenues | Clinic revenue
REVENUE AND DEFERRED REVENUE
Revenues	$ 21,808		$ 63,491
Percentage of Revenues	60.00%		60.00%
Product Category | U.S. | Revenues | Other
REVENUE AND DEFERRED REVENUE
Revenues	$ 389	$ 488	$ 1,130	$ 1,453
Percentage of Revenues	1.00%	3.00%	1.00%	3.00%
Product Category | International | Revenues
REVENUE AND DEFERRED REVENUE
Revenues	$ 1,049	$ 608	$ 1,993	$ 1,552
Percentage of Revenues	100.00%	100.00%	100.00%	100.00%
Product Category | International | Revenues | NeuroStar Advanced Therapy System
REVENUE AND DEFERRED REVENUE
Revenues	$ 448	$ 244	$ 774	$ 502
Percentage of Revenues	43.00%	40.00%	39.00%	32.00%
Product Category | International | Revenues | Treatment sessions
REVENUE AND DEFERRED REVENUE
Revenues	$ 214	$ 90	$ 644	$ 400
Percentage of Revenues	20.00%	15.00%	32.00%	26.00%
Product Category | International | Revenues | Other
REVENUE AND DEFERRED REVENUE
Revenues	$ 387	$ 274	$ 575	$ 650
Percentage of Revenues	37.00%	45.00%	29.00%	42.00%

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