Long-term Investments - Acquisition of Glory Connection Sdn. Bhd (Details) $ / shares in Units, $ in Thousands, shares in Millions		1 Months Ended	3 Months Ended	12 Months Ended
	Jul. 18, 2019 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) area a	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Impairment of equity method investments				$ 16,650	$ 13,068
Income Statement Information [Abstract]
Revenue				26,759	44,566
Gross profit				2,057	43,108
Net loss from operations				(86,879)	(68,574)
Net loss				(106,043)	(96,829)
Net income (loss) attributable to Glory				(98,400)	$ (98,508)
Glory
Percentage of voting equity interests acquired	34.00%
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares	12.2
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 24,400
Shares Issued, Price Per Share | $ / shares	$ 2.00
Allocation Of Consideration To Equity Method Investment				23,000
Allocation Of Consideration To Call Option				1,400
Glory | Call option
Percentage of voting equity interests acquired	20.40%
Glory | Scenario, Plan [Member]
Allocation Of Consideration To Call Option				0
Tree Technologies
Percentage of voting equity interests acquired		51.00%			51.00%
Number of acres | area		250
Glory
Impairment of equity method investments		$ 13,100	$ 6,900
Net Assets			$ 6,600	6,600
Income Statement Information [Abstract]
Revenue				33
Gross profit				10
Net loss from operations				(597)
Net loss				(586)
Net income (loss) attributable to Glory				(324)
Glory | Scenario, Plan [Member]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 20,000
Glory | Glory | Scenario, Plan [Member]
Shares Issued, Price Per Share | $ / shares	$ 1.64
Allocation Of Consideration To Equity Method Investment				$ 20,000
Glory | Tree Technologies
Number of acres | a		250
Bigfair Holdings Limited [Member] | Call option
Percentage of voting equity interests acquired	40.00%
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 13,200
Bigfair Holdings Limited [Member] | Glory
Percentage of voting equity interests acquired	51.00%