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Fair Value Measurements (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 | Dec. 31, 2019
Fair Value Measurements |  |
Fair value hierarchy for financial assets and liabilities | The following tables present the Company’s fair value hierarchy for financial assets and liabilities measured as of September 30, 2020 and December 31, 2019 ($ in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2020
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. Government obligations | ​ | $ | — | ​ | $ | 6.7 | ​ | $ | — | ​ | $ | 6.7
Total | ​ | $ | — | ​ | $ | 6.7 | ​ | $ | — | ​ | $ | 6.7
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2019
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. Government obligations | ​ | $ | — | ​ | $ | 5.9 | ​ | $ | — | ​ | $ | 5.9
Total | ​ | $ | — | ​ | $ | 5.9 | ​ | $ | — | ​ | $ | 5.9
| The following tables present the Company’s fair value hierarchy for financial assets and liabilities measured as of December 31, 2018 and 2019 ($ in millions): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements
​ | ​ | as of December 31, 2018
​ |  | ​ | Level 1 |  | ​ | Level 2 |  | ​ | Level 3 |  | ​ | Total
Assets: | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |
U.S. Government obligations | ​ | $ | — | ​ | $ | 3.2 | ​ | $ | — | ​ | $ | 3.2
Total | ​ | $ | — | ​ | $ | 3.2 | ​ | $ | — | ​ | $ | 3.2
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements
​ | ​ | as of December 31, 2019
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
U.S. Government obligations | ​ | $ | — | ​ | $ | 5.9 | ​ | $ | — | ​ | $ | 5.9
Total | ​ | $ | — | ​ | $ | 5.9 | ​ | $ | — | ​ | $ | 5.9
​
Schedule of reconciliation of movements in preferred stock warrant liability |  | ​
​ | ​ | ​ | ​
​ |  | Preferred Stock
​ | ​ | Warrant Liability
Balance as of December 31, 2017 | ​ | $ | 0.4
Change in fair value | ​ |  | 0.2
Exercise of preferred stock warrants | ​ |  | (0.6)
Balance as of December 31, 2018 | ​ | $ | —

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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