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Convertible Preferred Shares (Tables) | 12 Months Ended
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Dec. 31, 2019
Convertible Preferred Shares |
Summary of the issuances of convertible preferred shares | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | Original Issuance | ​ | ​
​ | ​ | ​ | ​ | Price per | ​ | Number of
Name |  | Issuance Date |  | Share* |  | Shares*
Series A1 Convertible Preferred Shares | ​ | June 2015 | ​ | $ | 0.0093 | ​ | 71,849,380
Series A2 Convertible Preferred Shares |  | June 2015 | ​ | $ | 0.0336 |  | 238,419,800
Series B1 Convertible Preferred Shares |  | November 2015 | ​ | $ | 0.1576 |  | 211,588,720
Series B2 Convertible Preferred Shares |  | January 2016 | ​ | $ | 0.1576 |  | 27,781,280
Series B3 Convertible Preferred Shares |  | March 2016 | ​ | $ | 0.1576 |  | 145,978,540
Series B4 Convertible Preferred Shares |  | June 2016 | ​ | $ | 0.1710 |  | 292,414,780
Series C1 Convertible Preferred Shares |  | February 2017 | ​ | $ | 0.3545 |  | 56,430,180
Series C2 Convertible Preferred Shares |  | February 2017 | ​ | $ | 0.3985 |  | 238,260,780
Series C3 Convertible Preferred Shares |  | June 2017 | ​ | $ | 0.4139 |  | 241,604,260
Series D Convertible Preferred Shares | ​ | March 2018** | ​ | $ | 2.4832 | ​ | 551,174,340
* In connection with the issuance of Series D convertible preferred shares, the Company effected a change of authorized share capital (Note15), the Company’s then issued and outstanding Convertible Preferred Shares were split on a 1-to-20 basis. The number of shares and per-share price in the consolidated financial statements were recasted on a retroactive basis to reflect the effect of these changes. ** Series D Convertible Preferred Shares were issued and converted in 2018. Therefore, the balance was nil as of December 31, 2018.

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- Definition Tabular disclosure of temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (27) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 + Details
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