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Long-Term Investments | 12 Months Ended
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Dec. 31, 2024
Long-Term Investments |
Long-Term Investments | 6. Long-Term Investments Carrying value of non-marketable securities is measured as the total initial cost plus the cumulative net gain (loss). Carrying value of non-marketable equity investments consist of the following for the periods presented: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​
​ | ​ | 2024 |  | 2023 | ​
Investments in SYNAPS Dx |  | $ | 512 | ​ | $ | 512 | ​
Total long-term investments | ​ | $ | 512 | ​ | $ | 512 | ​
​ In September 2020, the Company acquired a promissory note from NeuroDiagnostics Inc., which is doing business as SYNAPS Dx, in the principal amount of $500. Subsequently, in December 2020, the Company agreed to convert the promissory note, together with all accrued interest thereon, into shares of preferred stock of SYNAPS Dx as repayment in full of the promissory note. The value of the note exchanged for the shares of preferred stock of SYNAPS Dx held by the Company as of December 31, 2024 and 2023 was approximately $512. The investments in SYNAPS Dx as of December 31, 2024 were recorded in accordance with Accounting Standards Codification (“ASC”) 321, Investments – equity securities, which provides that investments in equity securities in privately-held companies without readily determinable fair values are generally recorded at cost, plus or minus subsequent observable price changes in orderly transactions for identical or similar investments, less impairments. The Company elected the practical expedient permitted by ASC 321 and recorded the above investments on a cost basis. As a part of the assessment for impairment indicators, the Company considers significant deterioration in the earnings performance and overall business prospects of the investee as well as significant adverse changes in the external environment these investments operate. If qualitative assessment indicates the investments are impaired, the fair value of these equity securities would be estimated, which would involve a significant degree of judgement and subjectivity. The Company assessed the investment for impairment in accordance with ASC 321. As of December 31, 2024, the Company determined that there was no impairment. As of December 31, 2023, the Company determined that there was an impairment to the preferred stock investment in Mellitus and recorded an impairment of $309 due to the following factors: 1) due to continued operating losses; 2) due to lack of revenue growth; and 3) delayed capital raise. The cumulative recorded impairment as of December 31, 2024, was $309. ​ ​

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