Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2019
Apr. 15, 2020
Jun. 30, 2019
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2019    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Entity Registrant Name Kaleyra, Inc.    
Entity Central Index Key 0001719489    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
Entity Common Stock, Shares Outstanding   19,969,048  
Entity Public Float     $ 180,373,799
Document Annual Report true    
Document Transition Report false    
Entity Interactive Data Current Yes    
Entity File Number 001-38320    
Entity Tax Identification Number 82-3027430    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One Via Marco D’Aviano, 2    
Entity Address, City or Town Milano MI    
Entity Address, Country IT    
Entity Address, Postal Zip Code 20131    
City Area Code +39 02    
Local Phone Number 288 5841    
Common Stock, Par Value $0.0001 Per Share      
Document Information [Line Items]      
Title of Each Class Common Stock, par value $0.0001 per share    
Trading Symbol KLR    
Name of Each Exchange on Which Registered NYSE    
Warrants to Receive One Share of Common Stock      
Document Information [Line Items]      
Title of Each Class Warrants to receive one share of Common Stock    
Trading Symbol KLR WS    
Name of Each Exchange on Which Registered NYSE