XML 25 R13.htm IDEA: XBRL DOCUMENT
v3.23.3

INVESTMENTS | 9 Months Ended
--- | ---
Sep. 30, 2023
INVESTMENTS |
INVESTMENTS |
5. | INVESTMENTS
The following table summarizes the Company’s investments at: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Continuous | ​ | Continuous
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​ | ​ | Loss Position | ​ | Loss Position
​ | ​ | Amortized | ​ | Holding | ​ | Holding | ​ | Fair | ​ | less than 12 | ​ | greater than 12
September 30, 2023 |  | Cost |  | Gains |  | Losses |  | Value |  | Months |  | Months
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial paper | ​ | $ | 270,002 | ​ | $ | — | ​ | $ | 2 | ​ | $ | 270,000 | ​ | $ | 2 | ​ | $ | —
Certificates of deposit | ​ | ​ | 15,366 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,366 | ​ | ​ | — | ​ | ​ | —
Municipal securities | ​ |  | 29,862 | ​ | ​ | — | ​ | ​ | 29 | ​ | ​ | 29,833 | ​ | ​ | 29 | ​ | ​ | —
U.S. government agency securities | ​ |  | 153,356 | ​ |  | 8 | ​ |  | 311 | ​ |  | 153,053 | ​ |  | 311 | ​ |  | —
U.S. treasuries | ​ | ​ | 536,966 | ​ |  | 9 | ​ |  | 1,234 | ​ |  | 535,741 | ​ |  | 1,234 | ​ |  | —
Corporate bonds | ​ | ​ | 233,328 | ​ | ​ | 5 | ​ | ​ | 574 | ​ | ​ | 232,759 | ​ | ​ | 574 | ​ | ​ | —
Long-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agency securities | ​ | ​ | 11,489 | ​ | ​ | — | ​ | ​ | 12 | ​ | ​ | 11,477 | ​ | ​ | 12 | ​ | ​ | —
U.S. treasuries | ​ | ​ | 30,364 | ​ | ​ | 3 | ​ | ​ | 29 | ​ | ​ | 30,338 | ​ | ​ | 29 | ​ | ​ | —
Corporate bonds | ​ | ​ | 10,845 | ​ | ​ | — | ​ | ​ | 24 | ​ | ​ | 10,821 | ​ | ​ | 24 | ​ | ​ | —
Total | ​ | $ | 1,291,578 | ​ | $ | 25 | ​ | $ | 2,215 | ​ | $ | 1,289,388 | ​ | $ | 2,215 | ​ | $ | —
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Continuous | ​ | Continuous
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​ | ​ | Loss Position | ​ | Loss Position
​ | ​ | Amortized | ​ | Holding | ​ | Holding | ​ | Fair | ​ | less than 12 | ​ | greater than 12
December 31, 2022 |  | Cost |  | Gains |  | Losses |  | Value |  | Months |  | Months
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial paper | ​ | $ | 197,712 | ​ | $ | 1 | ​ | $ | 4 | ​ | $ | 197,709 | ​ | $ | 4 | ​ | $ | —
Certificates of deposit | ​ | ​ | 10,078 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 10,078 | ​ | ​ | — | ​ | ​ | —
Municipal securities | ​ |  | 211,791 | ​ |  | 60 | ​ |  | 612 | ​ |  | 211,239 | ​ |  | 612 | ​ |  | —
U.S. government agency securities | ​ |  | 109,697 | ​ |  | 3 | ​ |  | 715 | ​ |  | 108,985 | ​ |  | 715 | ​ |  | —
U.S. treasuries | ​ | ​ | 838,825 | ​ | ​ | 17 | ​ | ​ | 4,539 | ​ | ​ | 834,303 | ​ | ​ | 4,539 | ​ | ​ | —
Long-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agency securities | ​ | ​ | 2,016 | ​ | ​ | — | ​ | ​ | 3 | ​ | ​ | 2,013 | ​ | ​ | 3 | ​ | ​ | —
U.S. treasuries | ​ | ​ | 53,215 | ​ | ​ | 20 | ​ | ​ | 71 | ​ | ​ | 53,164 | ​ | ​ | 71 | ​ | ​ | —
Variable rate demand notes | ​ | ​ | 6,266 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 6,266 | ​ | ​ | — | ​ | ​ | —
Total | ​ | $ | 1,429,600 | ​ | $ | 101 | ​ | $ | 5,944 | ​ | $ | 1,423,757 | ​ | $ | 5,944 | ​ | $ | —
​ During the three- and nine-months ended September 30, 2023 and 2022, realized gains or losses recognized on the sale of investments were not significant. The Company’s investments at September 30, 2023 and December 31, 2022 carried investment grade credit ratings. The following table summarizes the underlying contractual maturities of the Company’s investments at: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, 2023 | ​ | December 31, 2022
​ |  | Amortized Cost |  | Fair Value |  | Amortized Cost |  | Fair Value
Less than 1 year: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial paper | ​ | $ | 270,002 | ​ | $ | 270,000 |  | $ | 197,712 | ​ | $ | 197,710
Municipal securities | ​ |  | 29,862 | ​ |  | 29,833 |  |  | 211,791 | ​ |  | 211,239
U.S. government agency securities | ​ |  | 153,356 | ​ |  | 153,053 |  |  | 109,697 | ​ |  | 108,985
Certificates of deposit | ​ |  | 15,366 | ​ |  | 15,366 |  |  | 10,078 | ​ |  | 10,078
U.S. treasuries | ​ | ​ | 536,966 | ​ | ​ | 535,741 | ​ | ​ | 838,825 | ​ | ​ | 834,302
Corporate bonds | ​ | ​ | 233,328 | ​ | ​ | 232,759 | ​ | ​ | — | ​ | ​ | —
Due 1 - 10 years: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | ​ | 30,364 | ​ | ​ | 30,338 | ​ | ​ | 53,215 | ​ | ​ | 53,164
U.S. government agency securities | ​ |  | 11,489 | ​ |  | 11,477 |  |  | 2,016 | ​ |  | 2,013
Variable rate demand notes | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 4,862 | ​ | ​ | 4,862
Corporate bonds | ​ | ​ | 10,845 | ​ | ​ | 10,821 | ​ | ​ | — | ​ | ​ | —
Due 11 - 20 years: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Variable rate demand notes | ​ |  | — | ​ |  | — |  |  | 1,404 | ​ |  | 1,404
Total | ​ | $ | 1,291,578 | ​ | $ | 1,289,388 |  | $ | 1,429,600 | ​ | $ | 1,423,757
​

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//320/tableOfContent Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-10 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6B Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-6B Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) -Publisher SEC Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//946-320/tableOfContent Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//940-320/tableOfContent Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 320 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//942-320/tableOfContent + Details
Name: | us-gaap_InvestmentsInDebtAndMarketableEquitySecuritiesAndCertainTradingAssetsDisclosureTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration