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INVESTMENTS (Tables) | 6 Months Ended
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Jun. 30, 2024
INVESTMENTS. |
Summary of investments in available-for-sale | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Continuous | ​ | Continuous
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​ | ​ | Loss Position | ​ | Loss Position
​ | ​ | Amortized | ​ | Holding | ​ | Holding | ​ | Fair | ​ | less than | ​ | greater than
December 31, 2023 |  | Cost |  | Gains |  | Losses |  | Value |  | 12 Months |  | 12 Months
Available-for-sale | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Short-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Commercial paper | ​ | $ | 163,775 | ​ | $ | — | ​ | $ | 1 | ​ | $ | 163,774 | ​ | $ | 1 | ​ | $ | —
Certificates of deposit | ​ | ​ | 15,590 | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 15,590 | ​ | ​ | — | ​ | ​ | —
Municipal securities | ​ |  | 361 | ​ |  | — | ​ |  | — | ​ |  | 361 | ​ |  | — | ​ |  | —
U.S. government agency securities | ​ |  | 116,524 | ​ |  | 90 | ​ |  | 66 | ​ |  | 116,548 | ​ |  | 66 | ​ |  | —
U.S. treasuries | ​ | ​ | 412,936 | ​ | ​ | 205 | ​ | ​ | 1,084 | ​ | ​ | 412,057 | ​ | ​ | 1,084 | ​ | ​ | —
Corporate bonds | ​ | ​ | 247,340 | ​ | ​ | 89 | ​ | ​ | 154 | ​ | ​ | 247,275 | ​ | ​ | 154 | ​ | ​ | —
Long-term: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
U.S. government agency securities | ​ | ​ | 23,485 | ​ | ​ | 51 | ​ | ​ | 5 | ​ | ​ | 23,531 | ​ | ​ | 5 | ​ | ​ | —
U.S. treasuries | ​ | ​ | 35,896 | ​ | ​ | 79 | ​ | ​ | 8 | ​ | ​ | 35,967 | ​ | ​ | 8 | ​ | ​ | —
Corporate bonds | ​ | ​ | 16,903 | ​ | ​ | 32 | ​ | ​ | 2 | ​ | ​ | 16,933 | ​ | ​ | 2 | ​ | ​ | —
Total | ​ | $ | 1,032,810 | ​ | $ | 546 | ​ | $ | 1,320 | ​ | $ | 1,032,036 | ​ | $ | 1,320 | ​ | $ | —
​
Summary of the underlying contractual maturities of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2023
​ |  | Amortized Cost |  | Fair Value
Less than 1 year: | ​ | ​ | ​ | ​ | ​ | ​
Commercial paper | ​ | $ | 163,775 | ​ | $ | 163,774
Municipal securities | ​ |  | 361 | ​ |  | 361
U.S. government agency securities | ​ |  | 116,524 | ​ |  | 116,548
Certificates of deposit | ​ |  | 15,590 | ​ |  | 15,590
U.S. treasuries | ​ | ​ | 412,936 | ​ | ​ | 412,057
Corporate bonds | ​ | ​ | 247,340 | ​ | ​ | 247,275
Due 1 - 10 years: | ​ | ​ | ​ | ​ | ​ | ​
U.S. treasuries | ​ | ​ | 35,896 | ​ | ​ | 35,967
U.S. government agency securities | ​ |  | 23,485 | ​ |  | 23,531
Corporate bonds | ​ | ​ | 16,903 | ​ | ​ | 16,933
Total | ​ | $ | 1,032,810 | ​ | $ | 1,032,036
​

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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