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Deferred Revenue - Additional Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019 Customer	Jun. 30, 2020 USD ($) Customer	Jun. 30, 2019 Customer
Deferred Revenue [Abstract]
Revenue recognized | $	$ 0.4		$ 1.3
Number of customer accounted for more than 10% of revenues | Customer	1	0	1	0

X

- Definition

Number of customer accounted for more than 10% of revenues.

+ References

No definition available.

+ Details

Name:	stim_NumberOfCustomerAccountedForMoreThanTenPercentageOfRevenues
Namespace Prefix:	stim_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130549-203045

+ Details

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

X

- References

No definition available.

+ Details

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