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Reserve for Product Warranties - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014
Regulatory Assets [Abstract]
Product warranty accrual period	1 year

X

- Definition

Product Warranty Accrual Period

+ References

No definition available.

+ Details

Name:	nstg_ProductWarrantyAccrualPeriod
Namespace Prefix:	nstg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	nstg_RegulatoryAssetsAbstract
Namespace Prefix:	nstg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration