Deferred Revenue - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Revenues	$ 17,610	$ 16,329	$ 33,150	$ 30,510
Product Category | U.S. | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 17,289	$ 16,132	$ 32,253	$ 29,648
Percentage of Revenues	100.00%	100.00%	100.00%	100.00%
Product Category | U.S. | Revenue | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 4,489	$ 4,382	$ 8,339	$ 8,024
Percentage of Revenues	26.00%	27.00%	26.00%	27.00%
Product Category | U.S. | Revenue | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 12,314	$ 11,295	$ 22,957	$ 20,763
Percentage of Revenues	71.00%	70.00%	71.00%	70.00%
Product Category | U.S. | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 486	$ 455	$ 957	$ 861
Percentage of Revenues	3.00%	3.00%	3.00%	3.00%
Product Category | International | Revenue
Segment Reporting Information [Line Items]
Revenues	$ 321	$ 197	$ 897	$ 862
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	$ 56	$ 52	$ 314	$ 364
Percentage of Revenues	18.00%	26.00%	35.00%	42.00%
Product Category | International | Revenue | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 126	$ 14	$ 310	$ 184
Percentage of Revenues	39.00%	7.00%	35.00%	21.00%
Product Category | International | Revenue | Other
Segment Reporting Information [Line Items]
Revenues	$ 139	$ 131	$ 273	$ 314
Percentage of Revenues	43.00%	67.00%	30.00%	37.00%