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Net loss per share - Antidilutive (Details) - shares | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018
Net loss per share |  |
Total shares excluded from calculation (in shares) | 11,393,284 | 10,125,869
Stock Options |  |
Net loss per share |  |
Total shares excluded from calculation (in shares) | 10,743,181 | 9,545,522
Unvested restricted stock awards and units |  |
Net loss per share |  |
Total shares excluded from calculation (in shares) | 650,103 | 580,347

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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