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Convertible Preferred Shares - Issuances of convertible preferred shares (Details)	12 Months Ended	24 Months Ended
	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 shares
Convertible Preferred Shares
Conversion ratio for each Convertible Preferred Share into each Ordinary Share	1
Series A1 convertible preferred shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.0093
Number of Shares	71,849,380
Series A2 convertible preferred shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.0336
Number of Shares	238,419,800
Series B1 convertible preferred shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.1576
Number of Shares	211,588,720
Series B2 convertible preferred shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.1576
Number of Shares	27,781,280
Series B3 convertible preferred shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.1576
Number of Shares	145,978,540
Series B4 Convertible Preferred Shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.1710
Number of Shares	292,414,780
Series C1 convertible preferred shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.3545
Number of Shares	56,430,180
C2 Convertible Preferred Shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.3985
Number of Shares	238,260,780
Series C3 convertible preferred shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 0.4139
Number of Shares	241,604,260
Series D Convertible Preferred Shares
Convertible Preferred Shares
Original Issuance Price per Share | $ / shares	$ 2.4832
Number of Shares	551,174,340
Stock split ratio of Convertible Preferred Shares	0.05
Conversion of stock, shares issued		0

X

- Definition

The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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Number of shares issued for each share of convertible preferred stock that is converted.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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