Quarterly report pursuant to Section 13 or 15(d)

Document and Entity Information

Document and Entity Information - shares
9 Months Ended
Sep. 30, 2020
Oct. 31, 2020
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2020  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus Q3  
Trading Symbol SONM  
Entity Registrant Name SONIM TECHNOLOGIES INC  
Entity Central Index Key 0001178697  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company true  
Entity Ex Transition Period false  
Entity Small Business true  
Entity Common Stock, Shares Outstanding   66,162,019
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Title of 12(b) Security Common Stock par value $0.001 per share  
Security Exchange Name NASDAQ  
Entity File Number 001-38907  
Entity Incorporation, State or Country Code DE  
Entity Address, State or Province TX  
Entity Address, Address Line One 6836 Bee Cave Road, Bldg. 1  
Entity Address, Address Line Two S#279  
Entity Address, City or Town Austin  
Entity Tax Identification Number 94-3336783  
Entity Address, Postal Zip Code 78746  
City Area Code 650  
Local Phone Number 378-8100  
Document Quarterly Report true  
Document Transition Report false