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Fair Value of Financial Assets and Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2023
Fair Value of Financial Assets and Liabilities |
Schedule of financial assets and liabilities measured at fair value on a recurring basis | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements as of
​ | ​ | December 31, 2023 using:
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Money market funds | ​ | $ | 40,868 | ​ | $ | 4,979 | ​ | $ | — | ​ | $ | 45,847
Marketable securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate debt securities and commercial paper | ​ | ​ | — | ​ | ​ | 215,765 | ​ | ​ | — | ​ | ​ | 215,765
Total | ​ | $ | 40,868 | ​ | $ | 220,744 | ​ | $ | — | ​ | $ | 261,612
Liabilities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Derivative liability | ​ | $ | — | ​ | $ | — | ​ | $ | 1,150 | ​ | $ | 1,150
Total | ​ | $ | — | ​ | $ | — | ​ | $ | 1,150 | ​ | $ | 1,150
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Fair Value Measurements as of
​ | ​ | December 31, 2022 using:
​ |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Cash equivalents: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Commercial paper | ​ | $ | — | ​ | $ | 8,484 | ​ | $ | — | ​ | $ | 8,484
Money market funds | ​ |  | 99,962 | ​ |  | — | ​ |  | — | ​ |  | 99,962
Marketable securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Corporate debt securities and commercial paper | ​ | ​ | — | ​ | ​ | 205,611 | ​ | ​ | — | ​ | ​ | 205,611
Total | ​ | $ | 99,962 | ​ | $ | 214,095 | ​ | $ | — | ​ | $ | 314,057
Liabilities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Derivative liability | ​ | $ | — | ​ | $ | — | ​ | $ | 1,340 | ​ | $ | 1,340
Total | ​ | $ | — | ​ | $ | — | ​ | $ | 1,340 | ​ | $ | 1,340
Schedule of estimated fair value of embedded derivative liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Beginning aggregate estimated fair value of Level 3 liabilities | ​ | $ | 1,340 | ​ | $ | —
Initial recording of embedded derivative | ​ | ​ | — | ​ | ​ | 1,590
Change in fair value of embedded derivative | ​ | ​ | (190) | ​ | ​ | (250)
Ending aggregate estimated fair value of Level 3 liabilities | ​ | $ | 1,150 | ​ | $ | 1,340
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended
​ | ​ | December 31,
​ |  | 2023 |  | 2022
Beginning aggregate estimated fair value of Level 3 securities | ​ | $ | — | ​ | $ | —
Initial recording of RareStone equity | ​ | ​ | — | ​ | ​ | 1,040
Realized loss included in other expense | ​ | ​ | — | ​ | ​ | (1,040)
Ending aggregate estimated fair value of Level 3 securities | ​ | $ | — | ​ | $ | —
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities and commercial paper (due within 1 year) | ​ | $ | 215,491 | ​ | $ | 282 | ​ | $ | (7) | ​ | $ | 215,765
​ | ​ | $ | 215,491 | ​ | $ | 282 | ​ | $ | (7) | ​ | $ | 215,765
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair
​ |  | Cost |  | Gains |  | Losses |  | Value
Assets | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Corporate debt securities and commercial paper (due within 1 year) | ​ | $ | 205,702 | ​ | $ | — | ​ | $ | (91) | ​ | $ | 205,611
​ | ​ | $ | 205,702 | ​ | $ | — | ​ | $ | (91) | ​ | $ | 205,611
​

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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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