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INVESTMENTS | 12 Months Ended
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Dec. 31, 2022
INVESTMENTS |
INVESTMENTS | ​ 4. INVESTMENTS No net gains or losses were recognized on sales of equity securities during the year, and no unrealized gains or losses were recognized on equity securities held as of December 31, 2022 or as of December 31, 2021. As of December 31, 2022, the Company’s debt securities portfolio had unaccreted discounts of $139 and no remaining unamortized premiums. 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, 2022. Accrued interest receivable of $24 as of December 31, 2022, is not included in the table. ​
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​ | ​ | As of December 31, 2022 | ​
Investment securities available-for-sale: | ​ | Amortized Cost |  | Gross Unrealized Gain |  | Gross Unrealized Loss | ​ | Allowance For Credit Losses |  | Fair Value | ​
Commercial Paper | ​ | $ | 9,662 | ​ | $ | — | ​ | $ | (2) | ​ | $ | — | ​ | $ | 9,660 | ​
U.S. Treasury Securities | ​ | ​ | 5,249 | ​ | ​ | — | ​ | ​ | (46) | ​ | ​ | — | ​ | ​ | 5,203 | ​
Total investment securities available-for-sale | ​ | $ | 14,911 | ​ | $ | — | ​ | $ | (48) | ​ | $ | — | ​ | $ | 14,863 | ​
​ 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, 2022. The amounts include securities available-for-sale without an allowance for credit losses. As of December 31, 2022, the Company’s available-for-sale investment securities consisted of 52 securities, 39 of which are in an immaterial unrealized loss position of $31. As a result, there is no allowance for credit losses recorded for available-for-sale debt securities as of December 31, 2022. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, 2022
​ | ​ | 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 | ​ | $ | 6,464 | ​ | $ | (4) | ​ | $ | — | ​ | $ | — | ​ | $ | 6,464 | ​ | $ | (4)
U.S. Treasury Securities | ​ | ​ | 3,746 | ​ | ​ | (27) | ​ | ​ | 1,457 | ​ | ​ | (19) | ​ | ​ | 5,203 | ​ | ​ | (46)
Total investment securities available-for-sale | ​ | $ | 10,210 | ​ | $ | (31) | ​ | $ | 1,457 | ​ | $ | (19) | ​ | $ | 11,667 | ​ | $ | (50)
​ Maturities of Investment Securities The table below summarizes, as of December 31, 2022, 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, 2022 | ​
​ | ​ | 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 | ​ | $ | 9,660 | ​ | $ | — | ​ | $ | — | ​ | $ | — | ​ | $ | 9,660 | ​
U.S. Treasury Securities | ​ | ​ | 3,746 | ​ | ​ | 1,457 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 5,203 | ​
Total investment securities available-for-sale | ​ | $ | 13,406 | ​ | $ | 1,457 | ​ | $ | — | ​ | $ | — | ​ | $ | 14,863 | ​
Amortized cost of investment securities available-for-sale | ​ | $ | 13,434 | ​ | $ | 1,477 | ​ | $ | — | ​ | $ | — | ​ | $ | 14,911 | ​
​ Net Securities Gains or Losses and Securities Pledged ​ During the year ended December 31, 2022, the Company had no sales of debt securities categorized as available-for-sale, resulting in no realized gains or losses, and no securities were pledged.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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