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Convertible promissory notes (Details) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 11, 2019 shares | Dec. 10, 2018 USD ($) D item $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
CONVERTIBLE NOTES |  |  |  |
Term of debt instrument |  |  | 2 years |
Carrying amount of the convertible notes |  |  |  |
Balance at the beginning of the period |  |  | $ 51,922 |
Issuance |  |  |  | $ 29,131
Change in fair value |  |  | (14,591) | 22,791
Conversion to ordinary shares |  |  | (21,562) |
Forward contracts |  |  | $ (15,769) |
Balance at the end of the period |  |  |  | $ 51,922
Convertible promissory notes |  |  |  |
CONVERTIBLE NOTES |  |  |  |
Face amount of debt instrument |  | $ 85,550 |  |
Interest rate (as a percent) |  | 0.00% |  |
Term of debt instrument |  | 365 days |  |
Convertible promissory notes | Ezbuy |  |  |  |
Carrying amount of the convertible notes |  |  |  |
Number of ordinary shares issued upon conversion of convertible notes | shares | 13,154,284 |  |  |
Convertible promissory notes | ADSs |  |  |  |
Carrying amount of the convertible notes |  |  |  |
Trading price for 3 consecutive trading days | $ / shares |  | $ 3.85 |  |
Number of trading days for calculation of trading price | D |  | 3 |  |
Number of ordinary shares issued upon conversion of convertible notes | shares | 19,091,837 | 22,220,779 |  |
Number of highest trading closing prices | item |  | 10 |  |
Convertible promissory notes | ADSs | Maximum |  |  |  |
Carrying amount of the convertible notes |  |  |  |
Number of ordinary shares issued upon conversion of convertible notes | shares |  | 44,441,558 |  |
Average trading price of the ten highest closing price | $ / shares |  | $ 3.85 |  |
Convertible promissory notes | Ordinary Shares |  |  |  |
Carrying amount of the convertible notes |  |  |  |
Number of ordinary shares issued upon conversion of convertible notes | shares | 38,183,674 |  | 37,545,158 |

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- Definition Carrying value as of the balance sheet date of the portion of long-term debt due within one year or the operating cycle if longer identified as Convertible Notes Payable. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + 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 (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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