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Net loss per share - (Tables) | 9 Months Ended
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Sep. 30, 2020
Earnings Per Share [Abstract] |
Schedule of computation of basic and diluted net loss available to common stockholders | The following tables set forth the computation of basic and diluted net loss per share: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | ​ | Nine Months Ended September 30, | ​ | ​
​ |  | 2020 |  | 2019 |  | ​ | 2020 |  | 2019 |  | ​
Numerator | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net loss | ​ | $ | (69,692) |  | $ | (59,997) |  | ​ | $ | (363,806) |  | $ | (173,899) |  | ​
Denominator | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator for basic and diluted net loss per share | ​ |  | 67,641,171 |  |  | 56,463,528 |  | ​ |  | 65,068,281 |  |  | 57,798,968 |  | ​
Net loss per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic and diluted | ​ | $ | (1.03) | * | $ | (1.06) | * | ​ | $ | (5.59) | * | $ | (3.01) | * | ​
* In the three and nine months ended September 30, 2020 and 2019, the Company experienced a net loss and therefore did not report any dilutive share impact.
Schedule of historical dilutive common share equivalents outstanding | The following table shows historical dilutive common share equivalents outstanding, which are not included in the above historical calculation, as the effect of their inclusion is anti-dilutive during each period. ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of September 30, | ​
​ |  | 2020 |  | 2019 |
Stock Options | ​ | 11,528,241 | ​ | 10,743,181 | ​
Unvested restricted stock awards and units |  | 961,795 |  | 650,103 |
Total |  | 12,490,036 |  | 11,393,284 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + 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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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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