Geographical Segment Information - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 12,728	$ 10,152
Product Category | United States | Revenues
Segment Reporting Information [Line Items]
Revenues	$ 12,546	$ 9,972
Percentage of Revenues	100.00%	100.00%
Product Category | United States | Revenues | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 3,350	$ 2,373
Percentage of Revenues	27.00%	24.00%
Product Category | United States | Revenues | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 8,778	$ 7,240
Percentage of Revenues	70.00%	73.00%
Product Category | United States | Revenues | Other
Segment Reporting Information [Line Items]
Revenues	$ 418	$ 359
Percentage of Revenues	3.00%	3.00%
Product Category | International | Revenues
Segment Reporting Information [Line Items]
Revenues	$ 182	$ 180
Percentage of Revenues	100.00%	100.00%
Product Category | International | Revenues | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 72
Percentage of Revenues	40.00%	0.00%
Product Category | International | Revenues | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 19	$ 25
Percentage of Revenues	10.00%	14.00%
Product Category | International | Revenues | Other
Segment Reporting Information [Line Items]
Revenues	$ 91	$ 155
Percentage of Revenues	50.00%	86.00%