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Geographical Segment Information - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 9,741	$ 16,572	$ 21,217	$ 29,300
Product Category | United States | Revenues
Segment Reporting Information [Line Items]
Revenues	$ 9,267	$ 15,890	$ 20,444	$ 28,436
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	$ 2,338	$ 4,628	$ 4,932	$ 7,978
Percentage of Revenues	25.00%	29.00%	24.00%	28.00%
Product Category | United States | Revenues | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 6,547	$ 10,847	$ 14,740	$ 19,625
Percentage of Revenues	71.00%	68.00%	72.00%	69.00%
Product Category | United States | Revenues | Other
Segment Reporting Information [Line Items]
Revenues	$ 382	$ 415	$ 772	$ 833
Percentage of Revenues	4.00%	3.00%	4.00%	3.00%
Product Category | International | Revenues
Segment Reporting Information [Line Items]
Revenues	$ 474	$ 682	$ 773	$ 864
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	$ 310	$ 465	$ 410	$ 537
Percentage of Revenues	66.00%	68.00%	53.00%	62.00%
Product Category | International | Revenues | Treatment Sessions
Segment Reporting Information [Line Items]
Revenues	$ 115	$ 114	$ 192	$ 133
Percentage of Revenues	24.00%	17.00%	25.00%	15.00%
Product Category | International | Revenues | Other
Segment Reporting Information [Line Items]
Revenues	$ 49	$ 103	$ 171	$ 194
Percentage of Revenues	10.00%	15.00%	22.00%	23.00%

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