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COMMITMENTS AND CONTINGENCIES - Additional Information (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) lease | Sep. 30, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Number of leases | lease |  |  | 3 |
Lease expense | $ | $ 22 | $ 12 | $ 58 | $ 35

X
- Definition Finance Lease, Cost + References No definition available. + Details
Name: | land_FinanceLeaseCost
Namespace Prefix: | land_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of leases. + References No definition available. + Details
Name: | land_NumberOfLeases
Namespace Prefix: | land_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration