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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2017
Aug. 29, 2017
Dec. 31, 2016
Document And Entity Information      
Entity Registrant Name NIOCORP DEVELOPMENTS LTD    
Entity Central Index Key 0001512228    
Document Type 10-K    
Trading Symbol NIOBF    
Document Period End Date Jun. 30, 2017    
Amendment Flag false    
Current Fiscal Year End Date --06-30    
Entity a Well-known Seasoned Issuer No    
Entity a Voluntary Filer No    
Entity's Reporting Status Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 92,369,082
Entity Common Stock, Shares Outstanding   202,841,546  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017