Common stock shares issued and reserved for future issuance.

No definition available.

Name:	stim_CommonStockSharesIssuedAndReservedForFutureIssuance
Namespace Prefix:	stim_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Shares of common stock reserved for issuance.

+ References

No definition available.

+ Details

Name:	stim_SharesOfCommonStockReservedForIssuanceAbstract
Namespace Prefix:	stim_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Stockholders' deficit.

+ References

No definition available.

+ Details

Name:	stim_StockholdersDeficitLineItems
Namespace Prefix:	stim_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=stim_CommonStockWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=stim_RestrictedStockUnitsAndAwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_StockCompensationPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_EmployeeStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

STOCKHOLDERS' EQUITY - Summary of Common Stock Issued and Reserved for Issuance (Details) - shares shares in Thousands	Dec. 31, 2024	Dec. 31, 2023	Jul. 31, 2018
COMMON STOCK
Shares of common stock issued	55,679	29,092
Shares of common stock reserved for issuance for:
Total shares of common stock issued and reserved for issuance	69,114	36,076
Common stock warrants outstanding
Shares of common stock reserved for issuance for:
Shares of common stock reserved for issuance	1,725	41
Employee Stock Option
Shares of common stock reserved for issuance for:
Shares of common stock reserved for issuance	1,237	1,270
Restricted stock units outstanding
Shares of common stock reserved for issuance for:
Shares of common stock reserved for issuance	5,253	3,360
Shares available for grant under stock incentive plans
Shares of common stock reserved for issuance for:
Shares of common stock reserved for issuance	3,596	978
Shares available for sale under employee stock purchase plan
Shares of common stock reserved for issuance for:
Shares of common stock reserved for issuance	1,624	1,335	200