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Fair value of financial instruments and investments - (Tables) | 9 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Schedule of financial assets and liabilities that are required to be measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ |  | ​ | ​ |  | Quoted prices |  | Significant |  | ​ | ​
​ | ​ | ​ | ​ |  | in active |  | other |  | Significant
​ | ​ | ​ | ​ |  | markets for |  | observable |  | unobservable
​ | ​ | ​ | ​ |  | identical assets |  | inputs |  | inputs
​ |  | Total |  | (level 1) |  | (level 2) |  | (level 3)
Marketable securities - available for sale | ​ | $ | 1,625 | ​ | $ | — | ​ | $ | 1,625 | ​ | $ | —
Marketable securities - equity investments | ​ | $ | 128,028 | ​ | $ | 128,028 | ​ | $ | — | ​ | $ | —
ClearPoint Equity Investments - available for sale | ​ | $ | 4,482 | ​ | $ | 4,482 | ​ | $ | — | ​ | $ | —
ClearPoint convertible debt security | ​ | $ | 10,637 | ​ | $ | — | ​ | $ | 10,637 | ​ | $ | —
Contingent consideration payable- development and regulatory milestones | ​ | $ | 26,400 | ​ | $ | ​ | ​ | $ | ​ | ​ | $ | 26,400
Contingent consideration payable- net sales milestones and royalties | ​ | $ | 12,600 | ​ | $ | ​ | ​ | $ | ​ | ​ | $ | 12,600
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ |  | ​ | ​ |  | Quoted prices |  | Significant |  | ​ | ​
​ | ​ | ​ | ​ |  | in active |  | other |  | Significant
​ | ​ | ​ | ​ |  | markets for |  | observable |  | unobservable
​ | ​ | ​ | ​ |  | identical assets |  | inputs |  | inputs
​ |  | Total |  | (level 1) |  | (level 2) |  | (level 3)
Marketable securities - available for sale | ​ | $ | 22,610 | ​ | $ | — | ​ | $ | 22,610 | ​ | $ | —
Marketable securities - equity investments | ​ | $ | 108,261 | ​ | $ | 108,261 | ​ | $ | — | ​ | $ | —
ClearPoint Equity Investments | ​ | $ | 10,965 | ​ | $ | 10,965 | ​ | $ | — | ​ | $ | —
ClearPoint convertible debt security | ​ | $ | 15,231 | ​ | $ | — | ​ | $ | 15,231 | ​ | $ | —
Contingent consideration payable- development and regulatory milestones | ​ | $ | 82,500 | ​ | $ | — | ​ | $ | — | ​ | $ | 82,500
Contingent consideration payable- net sales milestones and royalties | ​ | $ | 81,500 | ​ | $ | — | ​ | $ | — | ​ | $ | 81,500
Summary of marketable securities accounted for as available-for-sale debt securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ |  | Amortized |  | Gross Unrealized | ​ | ​ | ​
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Corporate debt securities | ​ | $ | 1,649 | ​ | $ | — | ​ | $ | (24) | ​ | $ | 1,625
Total | ​ | $ | 1,649 | ​ | $ | — | ​ | $ | (24) | ​ | $ | 1,625
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ |  | Amortized |  | Gross Unrealized | ​ | ​ | ​
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
Commercial paper | ​ | $ | 12,419 | ​ | $ | 5 | ​ | $ | — | ​ | $ | 12,424
Corporate debt securities | ​ |  | 10,685 | ​ | ​ | — | ​ | ​ | (499) | ​ | ​ | 10,186
Total | ​ | $ | 23,104 | ​ | $ | 5 | ​ | $ | (499) | ​ | $ | 22,610
Summary of unrealized losses and fair values of available-for-sale debt securities in a continuous unrealized loss position | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ |  | Securities in an unrealized loss |  | Securities in an unrealized loss |  | ​ | ​ | ​ | ​ | ​
​ |  | position less than 12 months |  | position greater than or equal to 12 months | ​ | Total
​ |  | Unrealized losses |  | Fair Value |  | Unrealized losses |  | Fair Value |  | Unrealized losses |  | Fair Value
Corporate debt securities | ​ | $ | — | ​ | ​ | — | ​ | ​ | (24) | ​ | ​ | 1,625 | ​ | ​ | (24) | ​ | $ | 1,625
Total | ​ | $ | — | ​ | $ | — | ​ | $ | (24) | ​ | $ | 1,625 | ​ | $ | (24) | ​ | $ | 1,625
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ |  | Securities in an unrealized loss |  | Securities in an unrealized loss |  | ​ | ​ | ​ | ​ | ​
​ |  | position less than 12 months |  | position greater than or equal to 12 months | ​ | Total
​ |  | Unrealized losses |  | Fair Value |  | Unrealized losses |  | Fair Value |  | Unrealized losses |  | Fair Value
Corporate debt securities | ​ | $ | — | ​ | ​ | — | ​ | ​ | (499) | ​ | ​ | 10,186 | ​ | ​ | (499) | ​ | $ | 10,186
Total | ​ | $ | — | ​ | $ | — | ​ | $ | (499) | ​ | $ | 10,186 | ​ | $ | (499) | ​ | $ | 10,186
Schedule of marketable securities on the balance sheet | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ |  | Less Than |  | More Than
​ |  | 12 Months |  | 12 Months
Corporate debt securities | ​ | $ | 1,625 | ​ | $ | —
Total | ​ | $ | 1,625 | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ |  | Less Than |  | More Than
​ |  | 12 Months |  | 12 Months
Commercial paper | ​ | $ | 12,424 | ​ | $ | —
Corporate debt securities | ​ |  | — | ​ |  | 10,186
Total | ​ | $ | 12,424 | ​ | $ | 10,186
Summary of changes in the fair value of the Company's Level 3 valuation for contingent consideration payable | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Level 3 liabilities
​ | ​ | Contingent consideration payable- | ​ | Contingent consideration payable-
​ | ​ | development and regulatory | ​ | net sales milestones and royalties
​ |  | milestones |  | ​
Beginning balance as of December 31, 2022 | ​ | $ | 82,500 | ​ | $ | 81,500
Additions | ​ |  | — | ​ |  | —
Change in fair value | ​ |  | (56,100) | ​ |  | (68,900)
Payments | ​ | ​ | — | ​ | ​ | —
Ending balance as of September 30, 2023 | ​ | $ | 26,400 | ​ | $ | 12,600
​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Level 3 liabilities
​ | ​ | Contingent consideration payable- | ​ | Contingent consideration payable-
​ | ​ | development and regulatory | ​ | net sales milestones and royalties
​ |  | milestones |  | ​
Beginning balance as of December 31, 2021 | ​ | $ | 139,300 | ​ | $ | 100,600
Additions | ​ |  | — | ​ |  | —
Change in fair value | ​ |  | (10,800) | ​ |  | (21,400)
Reclass to accounts payable and accrued expenses | ​ | ​ | (50,000) | ​ | ​ | —
Payments | ​ | ​ | — | ​ | ​ | —
Ending balance as of September 30, 2022 | ​ | $ | 78,500 | ​ | $ | 79,200
Fair Value Measurement Inputs and Valuation Techniques | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023
​ |  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range
Contingent consideration payable- development and regulatory milestones | ​ | $26,400 |  | Probability-adjusted discounted cash flow |  | Potential development and regulatory milestones Probabilities of success Discount rates Projected years of payments | ​ | $0 - $31 million 85% - 92% 6.9% - 7.6% 2023 - 2026
Contingent considerable payable- net sales milestones and royalties | ​ | $12,600 |  | Option-pricing model with Monte Carlo simulation |  | Potential net sales milestones Probabilities of success Potential percentage of net sales for royalties Discount rate Projected years of payments | ​ | $0 - $50 million 85% - 100% 0% 12% 2025 - 2034
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ |  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range
Contingent consideration payable- development and regulatory milestones | ​ | $82,500 |  | Probability-adjusted discounted cash flow |  | Potential development and regulatory milestones Probabilities of success Discount rates Projected years of payments | ​ | $0 - $331 million 25% - 92% 6.2% - 8.3% 2023 - 2029
Contingent considerable payable- net sales milestones and royalties | ​ | $81,500 |  | Option-pricing model with Monte Carlo simulation |  | Potential net sales milestones Probabilities of success Potential percentage of net sales for royalties Discount rate Projected years of payments | ​ | $0 - $150 million 25% - 100% 2% - 6% 11.5% 2025 - 2041

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- Definition Tabular disclosure of fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + Details
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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + 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 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 + Details
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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References No definition available. + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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