Long-term Investments - Acquisition of Glory Connection Sdn. Bhd (Details) $ / shares in Units, shares in Millions			1 Months Ended	3 Months Ended					9 Months Ended
	Jul. 18, 2019 USD ($) $ / shares shares	Jun. 30, 2019 shares	Dec. 31, 2019 USD ($) a	Sep. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares		0.6
Impairment of equity method investments				$ 0		$ 0			$ 0	$ 0
Income Statement Information [Abstract]
Revenue				10,620,000		3,104,000			15,690,000	44,504,000
Gross profit				714,000		2,860,000			1,014,000	43,286,000
Net loss from operations				(11,999,000)		(9,404,000)			(37,702,000)	17,206,000
Net income (loss)					$ (12,726,000)	$ (12,305,000)	$ 5,277,000	$ 19,909,000	(47,765,000)	$ 12,881,000
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	$ 24,400,000
Shares Issued, Price Per Share | $ / shares	$ 2.00
Allocation Of Consideration To Equity Method Investment									23,000,000.0
Allocation Of Consideration To Call Option									1,400,000
Impairment of equity method investments			$ 13,100,000
Advance paid									400,000
Aggregate investment				7,300,000					7,300,000
Business Combination, Consideration Transferred									7,100,000
Glory | Call option
Percentage of voting equity interests acquired	20.40%
Glory | Scenario, Plan [Member]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 20,000,000.0
Allocation Of Consideration To Call Option									0
Tree Technologies
Percentage of voting equity interests acquired			51.00%
Glory
Income Statement Information [Abstract]
Revenue									5,000
Gross profit									(6,000)
Net loss from operations				(8,000)					(56,000)
Net income (loss)				21,000					(23,000)
Net income (loss) attributable to Glory				$ 11,000					(14,000)
Glory | Glory | Scenario, Plan [Member]
Shares Issued, Price Per Share | $ / shares	$ 1.64
Allocation Of Consideration To Equity Method Investment									$ 20,000,000.0
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	$ 13,200,000
Bigfair Holdings Limited [Member] | Glory
Percentage of voting equity interests acquired	51.00%