Geographical Segment Information - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 14,181	$ 12,288
Product Category | United States | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 13,517	$ 11,802
Percentage of Revenues	100.00%	100.00%
Product Category | United States | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 3,642	$ 1,755
Percentage of Revenues	27.00%	15.00%
Product Category | United States | Revenue | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 9,469	$ 9,629
Percentage of Revenues	70.00%	82.00%
Product Category | United States | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 406	$ 418
Percentage of Revenues	3.00%	3.00%
Product Category | International | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 664	$ 486
Percentage of Revenues	100.00%	100.00%
Product Category | International | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 313	$ 207
Percentage of Revenues	47.00%	43.00%
Product Category | International | Revenue | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 170	$ 131
Percentage of Revenues	26.00%	27.00%
Product Category | International | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 181	$ 148
Percentage of Revenues	27.00%	30.00%