v3.19.1
Supplier Concentration (Details) - Supplier Concentration Risk [Member] - Vendors
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Number of vendors
2
2
Purchases from vendors
39.80%
64.10%
X
- Definition
Number of vendors.
+ References
No definition available.
+ Details
Name:
gnln_NumberOfVendors
Namespace Prefix:
gnln_
Data Type:
xbrli:integerItemType
Balance Type:
na
Period Type:
duration
X
- References
No definition available.
+ Details
Name:
gnln_PurchasesFromVendorsPercentage
Namespace Prefix:
gnln_
Data Type:
num:percentItemType
Balance Type:
na
Period Type:
duration
X
- Details
Name:
us-gaap_ConcentrationRiskByTypeAxis=us-gaap_SupplierConcentrationRiskMember
Namespace Prefix:
Data Type:
na
Balance Type:
Period Type: