v3.21.1
Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Apr. 29, 2021
Jun. 30, 2020
Document Information [Line Items]      
Document Type 10-K/A    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2019    
Current Fiscal Year End Date --12-31    
Entity File Number 001-38875    
Entity Registrant Name Greenlane Holdings, Inc.    
Entity Central Index Key 0001743745    
Entity Tax Identification Number 83-0806637    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 1095 Broken Sound Parkway,    
Entity Address, Address Line Two Suite 300    
Entity Address, City or Town Boca Raton,    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33487    
City Area Code 877    
Local Phone Number 292-7660    
Title of 12(b) Security Class A Common Stock, $0.01 par value per share    
Trading Symbol GNLN    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status No    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company true    
Elected Not To Use the Extended Transition Period true    
Entity Shell Company false    
Entity Public Float     $ 48.8
ICFR Auditor Attestation Flag false    
Common Class A [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   16,929,522  
Common Class B [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   2,443,437  
Common Class C [Member]      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   70,301,343