Geographical Segment Information - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 16,498	$ 13,799	$ 47,008	$ 40,290
Product Category | United States | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 16,244	$ 13,280	$ 45,893	$ 38,891
Percentage of Revenues	100.00%	100.00%	100.00%	100.00%
Product Category | United States | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 3,934	$ 2,612	$ 11,959	$ 6,945
Percentage of Revenues	24.00%	20.00%	26.00%	18.00%
Product Category | United States | Revenue | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 11,864	$ 10,259	$ 32,627	$ 30,688
Percentage of Revenues	73.00%	77.00%	71.00%	79.00%
Product Category | United States | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 446	$ 409	$ 1,307	$ 1,258
Percentage of Revenues	3.00%	3.00%	3.00%	3.00%
Product Category | International | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 254	$ 519	$ 1,115	$ 1,399
Percentage of Revenues	100.00%	100.00%	100.00%	100.00%
Product Category | International | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 96	$ 306	$ 460	$ 797
Percentage of Revenues	38.00%	59.00%	41.00%	57.00%
Product Category | International | Revenue | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 31	$ 90	$ 214	$ 235
Percentage of Revenues	12.00%	17.00%	19.00%	17.00%
Product Category | International | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 127	$ 123	$ 441	$ 367
Percentage of Revenues	50.00%	24.00%	40.00%	26.00%