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INVESTMENTS | 12 Months Ended
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Dec. 31, 2024
INVESTMENTS |
INVESTMENTS | ​ 4. INVESTMENTS The table below presents the amortized cost, gross unrealized gains and losses, allowance for credit losses, and fair value aggregated by major security type as of December 31, 2024 and 2023. Accrued interest receivables of $40 and $20 as of December 31, 2024 and 2023, respectively, are not included in the tables. ​
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​ | ​ | As of December 31, 2024 | ​
Investment securities available-for-sale: | ​ | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss | ​ | Allowance For Credit Losses |  | Fair Value | ​
Commercial Paper | ​ | $ | 4,920 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 4,920 | ​
Corporate Bonds | ​ | ​ | 250 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 250 | ​
U.S. Treasury Securities | ​ | ​ | 5,970 | ​ | ​ | 14 | ​ | ​ | (1) | ​ | ​ | — | ​ | ​ | 5,983 | ​
Total investment securities available-for-sale | ​ | $ | 11,140 | ​ | $ | 14 | ​ | $ | (1) | ​ | $ | — | ​ | $ | 11,153 | ​
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​ | ​ | As of December 31, 2023 | ​
Investment securities available for sale: | ​ | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss | ​ | Allowance For Credit Losses |  | Fair Value | ​
Commercial paper | ​ | $ | 7,169 | ​ | $ | — | ​ | $ | (1) | ​ | $ | — | ​ | $ | 7,168 | ​
U.S. Treasury securities | ​ | ​ | 3,628 | ​ | ​ | — | ​ | ​ | (7) | ​ | ​ | — | ​ | ​ | 3,621 | ​
Total investment securities available for sale | ​ | $ | 10,797 | ​ | $ | — | ​ | $ | (8) | ​ | $ | — | ​ | $ | 10,789 | ​
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​ Investment Securities in a Gross Unrealized Loss Position The table below provides the gross unrealized losses and fair value of securities available-for-sale aggregated by major security type and the length of time that individual securities have been in a continuous unrealized loss position as of December 31, 2024 and 2023. The amounts include securities available-for-sale without an allowance for credit losses. As of December 31, 2024, the Company’s available-for-sale investment securities consisted of 42 securities, 2 of which are in an immaterial unrealized loss position. As of December 31, 2023, the Company’s available-for-sale investment securities consisted of 41 securities, 24 of which are in an immaterial unrealized loss position. As a result, there is no allowance for credit losses recorded for available-for-sale debt securities as of December 31, 2024 or 2023. ​
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​ | ​ | As of December 31, 2024
​ | ​ | Less than 12 Months | ​ | 12 Months or Longer | ​ | Total
Investment securities available-for-sale without an allowance for credit losses: | ​ | Fair Value |  | Gross Unrealized Loss |  | Fair Value | ​ | Gross Unrealized Loss |  | Fair Value | ​ | Gross Unrealized Loss
U.S. Treasury Securities | ​ | $ | — | ​ | $ | — | ​ | $ | 600 | ​ | $ | (1) | ​ | $ | 600 | ​ | $ | (1)
Total investment securities available-for-sale | ​ | $ | — | ​ | $ | — | ​ | $ | 600 | ​ | $ | (1) | ​ | $ | 600 | ​ | $ | (1)
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​ | ​ | As of December 31, 2023
​ | ​ | Less than 12 Months | ​ | 12 Months or Longer | ​ | Total
Investment securities available for sale without an allowance for credit losses: | ​ | Fair Value |  | Gross Unrealized Loss |  | Fair Value | ​ | Gross Unrealized Loss |  | Fair Value | ​ | Gross Unrealized Loss
Commercial paper | ​ | $ | 4,472 | ​ | $ | (1) | ​ | $ | — | ​ | $ | — | ​ | $ | 4,472 | ​ | $ | (1)
U.S. Treasury securities | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 2,043 | ​ | ​ | (7) | ​ | ​ | 2,043 | ​ | ​ | (7)
Total investment securities available for sale | ​ | $ | 4,472 | ​ | $ | (1) | ​ | $ | 2,043 | ​ | $ | (7) | ​ | $ | 6,515 | ​ | $ | (8)
​ Maturities of Investment Securities The table below summarizes, as of December 31, 2024, the fair value of investment securities by major security type and contractual maturity as well as the total fair value, and amortized cost of investment securities by contractual maturity. Because borrowers may have the right to call or prepay certain obligations, the expected maturities of securities are likely to differ from the scheduled contractual maturities presented below. ​
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​ | ​ | As of December 31, 2024 | ​
​ | ​ | Due in 1 Year or Less |  | Due > 1 Year through 5 Years |  | Due > 5 Years through 10 Years | ​ | Due > 10 Years |  | Total | ​
Fair value of investment securities available-for-sale: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial Paper | ​ | $ | 4,920 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 4,920 | ​
Corporate Bonds | ​ | ​ | — | ​ | ​ | 250 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 250 | ​
U.S. Treasury Securities | ​ | ​ | 2,678 | ​ | ​ | 3,305 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,983 | ​
Total investment securities available-for-sale | ​ | $ | 7,598 | ​ | $ | 3,555 | ​ | $ | — | ​ | $ | — | ​ | $ | 11,153 | ​
Amortized cost of investment securities available-for-sale | ​ | $ | 7,595 | ​ | $ | 3,545 | ​ | $ | — | ​ | $ | — | ​ | $ | 11,140 | ​
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​ The Company’s debt securities portfolio had unaccreted discounts of $59 and $114 and had no remaining unamortized premiums as of December 2024 and 2023, respectively. Net Securities Gains or Losses and Securities Pledged ​ The Company had no sales of debt securities during 2024 or 2022. During 2023, the Company had sales of debt securities totaling $2,336, resulting in a realized loss of $4. No securities were pledged during the years ended December 31, 2024, 2023 or 2022. ​ No net gains or losses and no unrealized gains or losses were recognized on equity securities held during the years ended December 31, 2024, 2023 or 2022.

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