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Subsequent Events - Additional Information (Detail) (Term Loan Facility [Member], USD $)
In Millions, unless otherwise specified
 3 Months Ended 0 Months Ended
Mar. 31, 2015
Apr. 16, 2015
Oct. 31, 2014
Subsequent Event [Line Items]      
Credit facility, additional borrowing capacity     $ 15.0nstg_LineCreditFacilityAdditionalBorrowingCapacity
Credit facility, maturity date 2015-11    
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Credit facility, additional borrowing capacity   $ 15.0nstg_LineCreditFacilityAdditionalBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= nstg_TermLoanFacilityMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		  
Credit facility, expiration period   6 months