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Share-based compensation | 3 Months Ended
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Mar. 31, 2019
Share-based compensation |
Share-based compensation | Note 10 — Share-based compensation The following table shows the total share-based compensation expense included in the unaudited consolidated statements of operations (thousands):
|  | Three months ended |
|  | March 31, |
|  | 2019 |  | 2018 |  |
Research and development |  | $ | 2,021 |  | $ | 2,554 |  |
General and administrative |  |  | 1,458 |  |  | 2,118 |  |
|  | $ | 3,479 |  | $ | 4,672 |  |
There were 10,807,200 and 9,994,656 options over ordinary shares granted in the three months ended March 31, 2019 and 2018 respectively, with a weighted average fair value of $0.55 and $0.75, respectively. Additionally, in the three months ended March 31, 2019 and 2018, 6,498,126 and 6,552,636 options were granted respectively, which have a nominal exercise price (similar to a restricted stock unit (RSU)), with a weighted average fair value of $0.94 and $1.34, respectively. The RSU-style options over ordinary shares in Adaptimmune Therapeutics plc were granted under the Adaptimmune Therapeutics plc Employee Share Option Scheme (adopted on January 14, 2016). These options have an exercise price equal to the nominal value of an ordinary share, of £0.001, and generally vest over four years, with 25% on the first, and each subsequent, anniversary of the grant date. The RSU-style options are not subject to performance conditions and the contractual term is ten years. The Company has elected to account for forfeitures of stock options when they occur by reversing compensation cost previously recognized, in the period the award is forfeited, for an award that is forfeited before completion of the requisite service period.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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