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Share-based Compensation - Summary of restricted shares activities (Details) - $ / shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation
Restricted shares, Vested	(5,637,860)	(1,812,960)	(190,160)
Restricted shares
Share-based Compensation
Restricted shares, Beginning balance	3,625,000	9,857,000	24,928,000
Restricted shares, Awarded			2,607,000
Restricted shares, Forfeited			(7,821,000)
Restricted shares, Vested	(3,625,000)	(6,232,000)	(9,857,000)
Restricted shares, Ending balance	0	3,625,000	9,857,000
Restricted weighted-average grant date fair value, Beginning balance	$ 0.21	$ 0.23	$ 0.23
Restricted weighted-average grant date fair value, Awarded			0.27
Restricted weighted-average grant date fair value, Forfeited			0.26
Restricted weighted-average grant date fair value, Vested	$ 0.21	0.24	0.22
Restricted weighted-average grant date fair value, Ending balance		$ 0.21	$ 0.23
Restricted share units
Share-based Compensation
Restricted shares, Beginning balance	12,264,000	4,510,000
Restricted shares, Awarded	2,192,900	13,080,200	9,611,020
Restricted shares, Forfeited	(2,612,000)	(2,308,000)	(5,101,000)
Restricted shares, Vested	(3,649,000)	(3,018,000)
Restricted shares, Ending balance	8,196,000	12,264,000	4,510,000
Restricted weighted-average grant date fair value, Beginning balance	$ 0.31	$ 0.20
Restricted weighted-average grant date fair value, Awarded	0.07	0.30	$ 0.22
Restricted weighted-average grant date fair value, Forfeited	0.33	0.20	0.24
Restricted weighted-average grant date fair value, Vested	0.29	0.19
Restricted weighted-average grant date fair value, Ending balance	$ 0.29	$ 0.31	$ 0.20

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(01)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
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+ References

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-Publisher FASB
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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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