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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Revenue Generated in Product Category for Years Indicated (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 71,348 | $ 65,206 | $ 55,312
Product Category | U.S. | Revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 69,336 | $ 63,406 | $ 53,447
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Product Category | U.S. | Revenue | NeuroStar Advanced Therapy System |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 16,460 | $ 16,575 | $ 9,760
Percentage of Revenues | 24.00% | 26.00% | 18.00%
Product Category | U.S. | Revenue | Treatment Sessions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 50,896 | $ 45,077 | $ 41,933
Percentage of Revenues | 73.00% | 71.00% | 78.00%
Product Category | U.S. | Revenue | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 1,980 | $ 1,754 | $ 1,754
Percentage of Revenues | 3.00% | 3.00% | 4.00%
Product Category | International | Revenue |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 2,012 | $ 1,800 | $ 1,865
Percentage of Revenues | 100.00% | 100.00% | 100.00%
Product Category | International | Revenue | NeuroStar Advanced Therapy System |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 629 | $ 811 | $ 1,108
Percentage of Revenues | 31.00% | 45.00% | 59.00%
Product Category | International | Revenue | Treatment Sessions |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 754 | $ 354 | $ 264
Percentage of Revenues | 38.00% | 20.00% | 14.00%
Product Category | International | Revenue | Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 629 | $ 635 | $ 493
Percentage of Revenues | 31.00% | 35.00% | 27.00%

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