Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
8 Months Ended
Dec. 31, 2017
Mar. 20, 2018
Jun. 30, 2017
Document And Entity Information      
Entity Registrant Name Black Ridge Acquisition Corp.    
Entity Central Index Key 0001708341    
Document Type 10-K    
Trading Symbol BRACU    
Document Period End Date Dec. 31, 2017    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
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     $ 0
Entity Common Stock, Shares Outstanding   17,695,000  
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2017