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Net Loss Per Ordinary Share | 12 Months Ended
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Dec. 31, 2018
Earnings Per Share [Abstract] |
Net Loss Per Ordinary Share | 9. NET LOSS PER ORDINARY SHARE Basic loss per share is computed by dividing net loss attributable to ordinary shareholders by the weighted-average number of ordinary shares outstanding:
|  | Year Ended December 31, |
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | (in thousands except share and per share data) |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to ordinary shareholders |  | $ | (146,653 | ) |  | $ | (101,980 | ) |  | $ | (55,660 | )
Denominator: |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average ordinary shares outstanding |  |  | 28,970,404 |  |  |  | 26,513,382 |  |  |  | 22,800,628 |
Net loss per share, basic and diluted |  | $ | (5.06 | ) |  | $ | (3.85 | ) |  | $ | (2.44 | )
The Company’s potentially dilutive shares, which include outstanding share options to purchase ordinary shares and restricted share units, are considered to be ordinary share equivalents and are only included in the calculation of diluted net loss per share when their effect is dilutive. The following potential ordinary shares, presented based on amounts outstanding at each period end, were excluded from the calculation of diluted net loss per share attributable to ordinary shareholders for the periods indicated because including them would have had an anti-dilutive effect:
|  | As of December 31, |
|  | 2018 |  |  | 2017 |
Options to purchase ordinary shares |  |  | 4,016,590 |  |  |  | 3,767,130 |
RSUs |  |  | 408,521 |  |  |  | 154,459 |
Series A preferred shares |  |  | 3,901,348 |  |  |  | 3,901,348 |

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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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