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Document and Entity Information - shares
 6 Months Ended
Dec. 31, 2019
Feb. 07, 2020
Document And Entity Information    
Entity Registrant Name NIOCORP DEVELOPMENTS LTD  
Entity Central Index Key 0001512228  
Amendment Flag false  
Current Fiscal Year End Date --06-30  
Document Type 10-Q  
Document Period End Date Dec. 31, 2019  
Document Fiscal Period Focus Q2  
Document Fiscal Year Focus 2020  
Entity Current Reporting Status Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company true  
Entity Ex Transition Period true  
Entity Common Stock, Shares Outstanding   234,839,598
Entity File Number 000-55710  
Entity Interactive Data Current Yes  
Entity Incorporation State Country Code A1