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Loss per share | 6 Months Ended
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Jun. 30, 2020
Loss per share |
Loss per share | 15.Loss per share Basic and diluted net loss per share for each of the periods presented are calculated as follow:
​ | ​ | ​ | ​ | ​
​ | ​ | Six months ended June 30,
​ |  | 2019 |  | 2020
​ | ​ | (Unaudited) | ​ |
Numerator: |  |  |  |
Net loss attributable to ordinary shareholders |  | (83,274) |  | (128,617)
Denominator: |  |  |  |
Weighted average number of ordinary shares - basic and diluted |  | 60,919,842 |  | 73,847,551
Net loss per share-basic and diluted |  | (1.37) |  | (1.74)
​ As a result of the Group’s net loss for the six months ended June 30, 2019 and 2020, share options and non-vested restricted shares outstanding in the respective periods were excluded from the calculation of diluted loss per share as their inclusion would have been anti-dilutive.
​ | ​ | ​ | ​ | ​
​ |  | As of
​ |  | December 31, |  | June 30,
​ | ​ | 2019 | ​ | 2020
​ | ​ | ​ | ​ | ​
Share options | ​ | 9,122,980 |  | 9,808,561
Non-vested restricted shares | ​ | 743,268 |  | 710,068
​

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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