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Cash, Cash Equivalents and Short-Term Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Cash, Cash Equivalents and Short-Term Investments |
Schedule of cash, cash equivalents and short-term investments | Cash, cash equivalents and short-term investments consisted of the following as of June 30, 2022 and December 31, 2021 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2022 |  | 2021
Cash | ​ | $ | 28,761 | ​ | $ | 27,788
Cash equivalents: | ​ |  | ​ | ​ | ​ | ​
Money market mutual fund | ​ |  | 8,273 | ​ | ​ | 111,313
Total cash and cash equivalents | ​ |  | 37,034 | ​ | ​ | 139,101
Short-term investments: | ​ |  | ​ | ​ | ​ | ​
U.S. Treasury notes and bills | ​ |  | 205,816 | ​ | ​ | 223,896
Mutual funds | ​ |  | 102,514 | ​ | ​ | 110,006
Corporate debt securities | ​ | ​ | 205,254 | ​ | ​ | 155,796
Total short-term investments | ​ |  | 513,584 | ​ | ​ | 489,698
Cash, cash equivalents and short-term investments | ​ | $ | 550,618 | ​ | $ | 628,799
​
Schedule of available-for-sale debt securities | The amortized cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale investments by type of security at June 30, 2022 were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
​ |  | Cost |  | Gains |  | Losses |  | Fair Value
U.S. Treasury notes | ​ | $ | 213,377 | ​ | $ | — | ​ | $ | (7,561) | ​ | $ | 205,816
Corporate debt securities | ​ | ​ | 217,021 | ​ | ​ | — | ​ | ​ | (11,767) | ​ | ​ | 205,254
Total available-for-sale investments | ​ | $ | 430,398 | ​ | $ | — | ​ | $ | (19,328) | ​ | $ | 411,070
​ The amortized cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale investments by type of security at December 31, 2021 were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Unrealized | ​ | Unrealized | ​ | ​ | ​
​ |  | Amortized Cost |  | Gains |  | Losses |  | Fair Value
U.S. Treasury notes | ​ | $ | 226,020 |  | $ | 12 | ​ | $ | (2,136) | ​ | $ | 223,896
Corporate debt securities | ​ | ​ | 157,527 |  | ​ | — |  | ​ | (1,731) | ​ | ​ | 155,796
Total available-for-sale investments | ​ | $ | 383,547 |  | $ | 12 | ​ | $ | (3,867) | ​ | $ | 379,692
Schedule of investments based on stated contractual maturities | The following table summarizes the fair value of available-for-sale investments based on stated contractual maturities as of June 30, 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
Due within one year | ​ | $ | 77,695 | ​ | $ | 76,845
Due after one year through five years | ​ |  | 352,703 | ​ |  | 334,225
Due after five years through ten years | ​ | ​ | — | ​ | ​ | —
Total | ​ | $ | 430,398 | ​ | $ | 411,070
​ The following table summarizes the fair value of available-for-sale investments based on stated contractual maturities as of December 31, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
Due within one year | ​ | $ | 39,081 |  | $ | 39,035
Due after one year through five years | ​ |  | 328,776 |  |  | 325,047
Due after five years through ten years | ​ | ​ | 15,690 | ​ | ​ | 15,610
Total | ​ | $ | 383,547 |  | $ | 379,692
Schedule of unrealized losses on investments | Unrealized losses during 2022 and 2021 related to equity securities held at June 30, 2022 and 2021 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Six Months Ended June 30,
​ |  | 2022 |  | 2021
Net losses recognized during the six months on equity securities | ​ | $ | (8,556) | ​ | $ | (156)
Less: net gains (losses) recognized during the year on equity securities sold during the period | ​ |  | — | ​ | ​ | —
Unrealized losses recognized during the six months on equity securities still held at June 30, 2022 and 2021 | ​ | $ | (8,556) | ​ | $ | (156)

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