v3.10.0.1
Document And Entity Information - shares
3 Months Ended
Jun. 30, 2018
Aug. 09, 2018
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Entity Registrant Name Constellation Alpha Capital Corp.  
Entity Central Index Key 0001651944  
Current Fiscal Year End Date --03-31  
Entity Filer Category Non-accelerated Filer  
Trading Symbol CNACU  
Entity Common Stock, Shares Outstanding   18,530,000