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INVESTMENT SECURITIES | 9 Months Ended
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Sep. 30, 2021
INVESTMENT SECURITIES |
INVESTMENT SECURITIES | NOTE 3 INVESTMENT SECURITIES Our investments as of September 30, 2021 and December 31, 2020 are classified as held-to-maturity. Held-to-maturity investments are recorded at amortized cost. The following table summarize our investment securities at September 30, 2021 and December 31, 2020:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2021
​ | ​ | Amortized | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | cost, as | ​ | unrealized | ​ | unrealized | ​ | Estimated
(in thousands) |  | adjusted |  | holding gains |  | holding losses |  | fair value
Short-term investments: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of domestic governmental agencies (maturing between October 2021 and April 2022) (held-to-maturity) | ​ | $ | 30,338 | ​ | $ | 3 | ​ | $ | 1 | ​ | $ | 30,340
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Long-term investments: |  | ​ | ​ |  | ​ |  |  | ​ |  |  | ​ |
Obligations of domestic governmental agencies (maturing between February 2023 and June 2023) (held-to-maturity) | ​ | ​ | 24,550 | ​ | ​ | 1 | ​ | ​ | 12 | ​ | ​ | 24,539
Total short-term and long-term investment securities | ​ | $ | 54,888 | ​ | $ | 4 | ​ | $ | 13 | ​ | $ | 54,879
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2020
​ |  | Amortized |  | Gross |  | Gross |  | ​ | ​
​ | ​ | cost, as | ​ | unrealized | ​ | unrealized | ​ | Estimated fair
​ | ​ | adjusted | ​ | holding gains | ​ | holding losses | ​ | value
Short-term investments: |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Obligations of domestic governmental agencies (maturing between January 2021 and December 2021) (held-to-maturity) | ​ | $ | 51,987 | ​ | $ | 1 | ​ | $ | 4 | ​ | $ | 51,984
Total short-term investment securities | ​ | $ | 51,987 | ​ | $ | 1 | ​ | $ | 4 | ​ | $ | 51,984
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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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