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Net Loss Per Share (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Net Loss Per Share |  |
Basic and diluted net loss per share | Basic and diluted net loss per share attributable to common stockholders was calculated as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended |  | Nine Months Ended
​ | ​ | September 30, | ​ | September 30,
​ | ​ | 2020 |  | 2019 |  | 2020 |  | 2019
Numerator: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Net loss attributable to common stockholders ($in millions) | ​ | $ | (30.9) | ​ | $ | (31.1) | ​ | $ | (88.4) | ​ | $ | (75.8)
Denominator: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Weighted average common shares outstanding — basic and diluted | ​ |  | 53,997,315 | ​ |  | 11,178,924 | ​ |  | 25,935,362 | ​ |  | 11,079,303
Net loss per share attributable to common stockholders — basic and diluted | ​ | $ | (0.57) | ​ | $ | (2.78) | ​ | $ | (3.41) | ​ | $ | (6.84)
​ | Basic and diluted net loss per share attributable to common stockholders was calculated as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2018 |  | 2019
Numerator: | ​ | ​ | ​ |  | ​ |
Net loss attributable to common stockholders (in millions) | ​ | $ | (52.9) | ​ | $ | (108.5)
Denominator: | ​ |  |  | ​ |  |
Weighted average common shares outstanding — basic and diluted | ​ |  | 10,931,776 | ​ |  | 11,124,397
Net loss per share attributable to common stockholders — basic and diluted | ​ | $ | (4.84) | ​ | $ | (9.75)
Antidilutive potential common shares | computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect: ​
​ | ​ | ​ | ​ | ​
​ |  | As of
​ |  | September 30,
​ | ​ | 2020 | ​ | 2019
Options to purchase common stock |  | 4,814,924 |  | 3,925,395
Convertible preferred stock (as converted to common stock) |  | — |  | 31,557,107
​ |  | 4,814,924 |  | 35,482,502
| ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ | ​ | 2018 | ​ | 2019
Options to purchase common stock |  | 2,169,000 |  | 4,048,802
Convertible preferred stock (as converted to common stock) |  | 24,445,555 |  | 31,557,107
​ |  | 26,614,555 |  | 35,605,909

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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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