Document and Entity Information	3 Months Ended
	Mar. 31, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	NRTHF
Entity Registrant Name	Northern Power Systems Corp.
Entity Central Index Key	0001605997
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Common Class Undefined [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	22,765,949
Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding	0