Interest income generated from notes receivable.

No definition available.

Name:	stim_InterestIncomeNotesReceivable
Namespace Prefix:	stim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The amount of decrease in loan receivable forgiven by the entity.

+ References

No definition available.

+ Details

Name:	stim_LoansReceivableDecreaseForgiveness
Namespace Prefix:	stim_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The principal amount of notes receivable.

+ References

No definition available.

+ Details

Name:	stim_NotesReceivablePrincipalAmount
Namespace Prefix:	stim_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Term of notes receivable.

+ References

No definition available.

+ Details

Name:	stim_NotesReceivableTerm
Namespace Prefix:	stim_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of master sales agreement.

+ References

No definition available.

+ Details

Name:	stim_TermOfMasterSalesAgreement
Namespace Prefix:	stim_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage added to reference rate used to compute variable rate on loan receivable.

+ References

No definition available.

+ Details

Name:	us-gaap_LoansReceivableBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The cash outflow for a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-15

+ Details

Name:	us-gaap_RepaymentsOfNotesPayable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_CounterpartyNameAxis=stim_GreenbrookTMSIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=stim_SecuredPromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=stim_SuccessTMSMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_OtherNonoperatingIncomeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

NOTES RECEIVABLE (Details) - USD ($) $ in Millions					12 Months Ended
NOTES RECEIVABLE (Details) - USD ($) $ in Millions	Dec. 09, 2024	Mar. 31, 2023	Jul. 14, 2022	Sep. 29, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Greenbrook TMS Inc \| Secured Promissory Note
NOTES RECEIVABLE
Principal amount of notes receivable		$ 6.0
Term of notes receivable		4 years
Loan receivable forgiven by the entity	$ 3.6
Greenbrook TMS Inc \| Secured Overnight Financing Rate \| Secured Promissory Note
NOTES RECEIVABLE
Interest rate (as a percent)		7.65%
Success TMS
NOTES RECEIVABLE
Repayment of notes issued			$ 10.5
Success TMS \| Secured Promissory Note
NOTES RECEIVABLE
Principal amount of notes receivable				$ 10.0
Term of notes receivable				5 years
Term of master sales agreement				5 years
Success TMS \| Other income, net \| Secured Promissory Note
NOTES RECEIVABLE
Interest income recognized					$ 0.5	$ 0.6	$ 1.0