Summary of changes in fair value of company's level 3 financial liabilities (Detail) - Warrants	9 Months Ended
Sep. 30, 2015 USD ($)
Summary of changes in the fair value [Line Items]
Balance	$ 5,307,332
Repurchase of warrants in conjunction with public offering	(943,423)
Change in fair value of warrant liability	(3,473,804)
Balance	890,105
2014 Offering
Summary of changes in the fair value [Line Items]
Balance	4,233,729
Repurchase of warrants in conjunction with public offering	(943,423)
Change in fair value of warrant liability	(2,625,305)
Balance	665,001
2013 Offering
Summary of changes in the fair value [Line Items]
Balance	1,073,603
Repurchase of warrants in conjunction with public offering	0
Change in fair value of warrant liability	(848,499)
Balance	$ 225,104

Amount of repurchase of warrants in conjunction with public offering of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

No definition available.

+ Details

Name:	nuro_FairValueMeasurementsWithUnobservableInputsReconciliationRecurringBasisLiabilityRepurchaseOfWarrants
Namespace Prefix:	nuro_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

Name:	nuro_SummaryOfChangesInFairValueLineItems
Namespace Prefix:	nuro_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

+ Details

Name:	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_WarrantMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=nuro_TwoThousandAndFourteenOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByAssetClassAxis=nuro_TwoThousandAndThirteenOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: