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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 12,448	$ 16,000	$ 33,665	$ 45,300
Product Category | United States | Revenues
Segment Reporting Information [Line Items]
Revenues	$ 12,029	$ 15,294	$ 32,473	$ 43,730
Percentage of Revenues	100.00%	100.00%	100.00%	100.00%
Product Category | United States | Revenues | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 2,541	$ 4,616	$ 7,474	$ 12,594
Percentage of Revenues	21.00%	30.00%	23.00%	29.00%
Product Category | United States | Revenues | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 9,083	$ 10,252	$ 23,823	$ 29,877
Percentage of Revenues	76.00%	67.00%	73.00%	68.00%
Product Category | United States | Revenues | Other
Segment Reporting Information [Line Items]
Revenues	$ 405	$ 426	$ 1,176	$ 1,259
Percentage of Revenues	3.00%	3.00%	4.00%	3.00%
Product Category | International | Revenues
Segment Reporting Information [Line Items]
Revenues	$ 419	$ 706	$ 1,192	$ 1,570
Percentage of Revenues	100.00%	100.00%	100.00%	100.00%
Product Category | International | Revenues | NeuroStar Advanced Therapy System
Segment Reporting Information [Line Items]
Revenues	$ 222	$ 465	$ 632	$ 1,002
Percentage of Revenues	53.00%	66.00%	53.00%	64.00%
Product Category | International | Revenues | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 99	$ 114	$ 291	$ 247
Percentage of Revenues	24.00%	16.00%	24.00%	16.00%
Product Category | International | Revenues | Other
Segment Reporting Information [Line Items]
Revenues	$ 98	$ 127	$ 269	$ 321
Percentage of Revenues	23.00%	18.00%	23.00%	20.00%