v3.7.0.1
Document and Entity Information - shares
3 Months Ended
Mar. 31, 2017
May 03, 2017
Document Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q1  
Trading Symbol NK  
Entity Registrant Name NANTKWEST, INC.  
Entity Central Index Key 0001326110  
Current Fiscal Year End Date --12-31  
Entity Filer Category Accelerated Filer  
Entity Common Stock, Shares Outstanding   82,155,862