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Marketable Securities (Tables) | 12 Months Ended
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Dec. 31, 2022
Marketable Securities |
Schedule of marketable securities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated
(in thousands) |  | Cost |  | Gain |  | Loss |  | Fair Value
Corporate bonds | ​ | $ | 133,163 | ​ | $ | — | ​ | $ | (1,457) | ​ | $ | 131,706
U.S. Government agencies | ​ | ​ | 1,612 | ​ | ​ | — | ​ | ​ | (37) | ​ | ​ | 1,575
Total | ​ | $ | 134,775 | ​ | $ | — | ​ | $ | (1,494) | ​ | $ | 133,281
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Estimated
(in thousands) |  | Cost |  | Gain |  | Loss |  | Fair Value
Corporate bonds | ​ | $ | 207,917 | ​ | $ | 3 | ​ | $ | (666) | ​ | $ | 207,254
Total | ​ | $ | 207,917 | ​ | $ | 3 | ​ | $ | (666) | ​ | $ | 207,254
​
Schedule of available-for-sale maturities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2022
​ | ​ | ​ | ​ | ​ | Fair
(in thousands) |  | Cost |  | Value
Maturities: | ​ | ​ | ​ | ​ | ​ | ​
Within 1 year | ​ | $ | 105,930 | ​ | $ | 104,660
Between 1 to 2 years | ​ |  | 28,845 | ​ |  | 28,621
Total investments available-for-sale | ​ | $ | 134,775 | ​ | $ | 133,281
​

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- Definition Tabular disclosure of the maturities of available-for-sale securities from cost basis to fair value. + References No definition available. + Details
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