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INVESTMENTS | 12 Months Ended
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Dec. 31, 2024
INVESTMENTS. |
INVESTMENTS | 5.INVESTMENTS The Company held no short-term or long-term investments at December 31, 2024. The following table summarizes the Company’s investments at December 31, 2023. ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Continuous | ​ | Continuous
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized
​ | ​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​ | ​ | Loss Position | ​ | Loss Position
​ | ​ | Amortized | ​ | Holding | ​ | Holding | ​ | Fair | ​ | less than 12 | ​ | greater than
December 31, 2023 |  | Cost |  | Gains |  | Losses |  | Value |  | 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 | ​ | $ | —
​ During the years ended December 31, 2024, 2023 and 2022, realized gains or losses recognized on the sale of investments were not significant. The Company’s investments at December 31, 2023 carried investment grade credit ratings. The Company held no short-term or long-term investments at December 31, 2024. The following table summarizes the underlying contractual maturities of the Company’s investments at December 31, 2023. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 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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