v3.23.1

LONG-TERM INVESTMENTS - Schedule of equity investments without readily determinable fair values - Parenthetical (Details) $ in Thousands, $ in Thousands, ¥ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2022 HKD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2021 HKD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 30, 2019 CNY (¥)	Jan. 31, 2016
LONG-TERM INVESTMENTS, NET
Impairment loss on cost method investments		$ 48,732		$ 52,739
Amount of consideration received for sale of investments		$ 0		$ 0		$ 7,245
Outstanding amount of supplementary agreement | ¥								¥ 380
Zhangshangtong Air Service (Beijing) Co., Ltd. ("Zhangshangtong")
LONG-TERM INVESTMENTS, NET
Ownership percentage		13.00%	13.00%	13.00%	13.00%
Impairment loss on cost method investments				$ (589)
Beijing Zhongjiao Huineng Information Technology Co., Ltd ("Zhongjiao Huineng")
LONG-TERM INVESTMENTS, NET
Ownership percentage									13.30%
Impairment loss on cost method investments			$ 545		$ 589
AM Advertising
LONG-TERM INVESTMENTS, NET
Ownership percentage		20.00%	20.00%	20.00%	20.00%
Impairment loss on cost method investments		$ 48,187		$ 52,150
AM Advertising with Foreign Currency Translation Adjustment
LONG-TERM INVESTMENTS, NET
Ownership percentage	20.32%
Impairment loss on cost method investments	$ 50,159
Accumulated impairment loss on investments						$ 50,932	$ 47,736

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Amount of impairment loss on investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (b)
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