Deferred Revenue - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Segment Reporting Information [Line Items]
Revenues	$ 15,540	$ 14,181
Product Category | United States | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 14,964	$ 13,517
Percentage of Revenues	100.00%	100.00%
Product Category | United States | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 3,850	$ 3,642
Percentage of Revenues	26.00%	27.00%
Product Category | United States | Revenue | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 10,643	$ 9,469
Percentage of Revenues	71.00%	70.00%
Product Category | United States | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 471	$ 406
Percentage of Revenues	3.00%	3.00%
Product Category | International | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 576	$ 664
Percentage of Revenues	100.00%	100.00%
Product Category | International | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 259	$ 313
Percentage of Revenues	45.00%	47.00%
Product Category | International | Revenue | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 184	$ 170
Percentage of Revenues	32.00%	26.00%
Product Category | International | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 133	$ 181
Percentage of Revenues	23.00%	27.00%