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Basic and diluted earnings per share | 6 Months Ended
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Jun. 30, 2019
Basic and diluted earnings per share | 10 Basic and diluted earnings per share ​ Diluted earnings per share are calculated by adjusting the weighted average number of ordinary shares outstanding, assuming conversion of all potentially dilutive ordinary shares. As the Company has incurred a loss, all potentially dilutive ordinary shares would have an antidilutive effect, if converted, and thus have been excluded from the computation of loss per share. ​ The potentially dilutive ordinary shares are summarized below: ​
​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ |  | 2019 |  | 2018
​ | ​ | (ordinary shares)
BMS warrants | ​ | 8,435,000 | ​ | 7,530,000
Stock options under 2014 Plans | ​ | 2,943,756 | ​ | 2,694,741
Non-vested RSUs and earned PSUs | ​ | 842,859 | ​ | 943,853
Stock options under 2012 Plan | ​ | 14,000 | ​ | 33,467
Warrants (exercised February 1, 2019) | ​ | — | ​ | 37,175
Employee share purchase plan | ​ | 596 | ​ | —
Total potential dilutive ordinary shares | ​ | 12,236,211 | ​ | 11,239,236
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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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