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Stock-based compensation (Tables) | 9 Months Ended
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Sep. 30, 2015
Stock-based compensation |
Summary of the Company's stock option activity |
|  | Shares |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Agregate Intrinsic Value (in thousands) |
Outstanding at December 31, 2014 |  | 1,226,140 |  | $ | 4.14 |  | 8.15 |  | $ | 6,579 |
Granted |  | 550,797 |  | 11.69 |  |  |  |  |
Exercised |  | (25,045 | ) | 2.05 |  |  |  |  |
Cancelled or forfeited |  | (39,881 | ) | 5.46 |  |  |  |  |
Outstanding at September 30, 2015 |  | 1,712,011 |  | $ | 6.57 |  | 8.11 |  | $ | 4,560 |
Exercisable at September 30, 2015 |  | 755,860 |  | $ | 3.27 |  | 6.89 |  | $ | 3,659 |
Vested or expected to vest at September 30, 2015 |  | 1,586,233 |  | $ | 6.30 |  | 8.02 |  | $ | 4,489 |
Schedule of stock-based compensation expense | Total stock-based compensation expense is recognized for stock options granted to employees and non-employees and has been reported in the Company’s statements of operations as follows (in thousands):
|  | Three Months Ended September 30, |  | Nine Months Ended September 30, |
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |
Research and development |  | $ | 173 |  | $ | 100 |  | $ | 505 |  | $ | 289 |
General and administrative |  | 315 |  | 132 |  | 638 |  | 316 |
Total |  | $ | 488 |  | $ | 232 |  | $ | 1,143 |  | $ | 605 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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