SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of revenues by service categories (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues from operations:
Revenues	$ 2,969	$ 11,796	$ 23,546
Air Travel Media Network
Revenues from operations:
Revenues	2,768	9,191	23,474
Gas Station Media Network
Revenues from operations:
Revenues	0	2,604
Others
Revenues from operations:
Revenues	$ 201	$ 1	$ 72

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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+ Details