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Cash, Cash Equivalents and Short-Term Investments (Tables) | 6 Months Ended
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Jun. 30, 2021
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, 2021 and December 31, 2020 (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30, | ​ | December 31,
​ |  | 2021 |  | 2020
Cash | ​ | $ | 29,609 | ​ | $ | 25,053
Cash equivalents: | ​ |  | ​ | ​ | ​ | ​
Money market mutual fund | ​ |  | 30,748 | ​ | ​ | 11,820
Total cash and cash equivalents | ​ |  | 60,357 | ​ | ​ | 36,873
Short-term investments: | ​ |  | ​ | ​ | ​ | ​
U.S. Treasury notes and bills | ​ |  | 229,131 | ​ | ​ | 23,309
Mutual funds | ​ |  | 59,925 | ​ | ​ | 33,135
Total short-term investments | ​ |  | 289,056 | ​ | ​ | 56,444
Cash, cash equivalents and short-term investments | ​ | $ | 349,413 | ​ | $ | 93,317
​
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, 2021 were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized |  | Unrealized |  | Unrealized |  | ​ | ​
​ | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Fair Value
U.S. Treasury notes | ​ | $ | 230,140 | ​ | $ | 83 | ​ | $ | (1,092) | ​ | $ | 229,131
Total available-for-sale investments | ​ | $ | 230,140 | ​ | $ | 83 | ​ | $ | (1,092) | ​ | $ | 229,131
​ The amortized cost, gross unrealized gains, gross unrealized losses and fair value of available-for-sale investments by type of security at December 31, 2020 were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Unrealized |  | Unrealized |  | ​ | ​
​ | ​ | Amortized Cost | ​ | Gains | ​ | Losses | ​ | Fair Value
U.S. Treasury notes | ​ | $ | 23,179 |  | $ | 173 |  | $ | (43) | ​ | $ | 23,309
Total available-for-sale investments | ​ | $ | 23,179 |  | $ | 173 | ​ | $ | (43) | ​ | $ | 23,309
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, 2021: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
Due within one year | ​ | $ | 75,078 | ​ | $ | 75,135
Due between one and two years | ​ |  | 155,062 | ​ |  | 153,996
Total | ​ | $ | 230,140 | ​ | $ | 229,131
​ The following table summarizes the fair value of available-for-sale investments based on stated contractual maturities as of December 31, 2020: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Amortized Cost |  | Fair Value
Due within one year | ​ | $ | 14,084 |  | $ | 14,111
Due between one and two years | ​ |  | 9,095 |  |  | 9,198
Total | ​ | $ | 23,179 |  | $ | 23,309
Schedule of unrealized gains (losses) on investments | Unrealized gains (losses) during 2021 and 2020 related to equity securities held at June 30, 2021 and 2020 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ |  | ​ | 2021 | ​ | ​ | 2020
Net losses recognized during the six months ended June 30 on equity securities |  | $ | (156) | ​ | $ | (468)
Less: net gains (losses) recognized during the year on equity securities sold during the period | ​ |  | — |  | ​ | (805)
Unrealized gains (losses) recognized during the six months on equity securities still held at June 30, 2021 and 2020 | ​ | $ | (156) | ​ | $ | 337

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