v3.10.0.1
Document And Entity Information - shares
9 Months Ended
Dec. 31, 2018
Feb. 13, 2019
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Dec. 31, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
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
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Small Business true