| Summary of Short-term, Long-term Investments and Marketable Securities |
The Company’s investments consisted of the following: | | | | | | | | | | | | | | | | | | | | | | | | | As of September 30, 2022 | | (In thousands) | | Adjusted Basis | | Gross
Unrealized Gains | | Gross
Unrealized Losses | | Fair Value | | | | | | | | | | Short-term investments (due within one year) | | | | | | | | | Held to maturity debt securities | $ | 218,391 | | | $ | — | | | $ | (3,661) | | | $ | 214,730 | | | Held to maturity certifiate of deposit | 50,000 | | | — | | | — | | | 50,000 | | | Total short-term investments | $ | 268,391 | | | $ | — | | | $ | (3,661) | | | $ | 264,730 | | | | | | | | | | | Long-term investments (Due within one through three years) | | | | | | | | | Held to maturity debt securities | 105,872 | | | — | | | (5,569) | | | 100,303 | | | Total long-term investments | $ | 105,872 | | | $ | — | | | $ | (5,569) | | | $ | 100,303 | | | | | | | | | | | Marketable debt securities | $ | — | | | $ | — | | | $ | — | | | $ | — | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | As of September 30, 2021 | | (In thousands) | | Adjusted Basis | | Gross
Unrealized Gains | | Gross
Unrealized Losses | | Fair Value | | | | | | | | | | Short-term investments (due within one year) | | | | | | | | | Held to maturity debt securities | $ | 56,627 | | | $ | 803 | | | $ | — | | | $ | 57,430 | | | Total short-term investments | $ | 56,627 | | | $ | 803 | | | $ | — | | | $ | 57,430 | | | | | | | | | | | Long-term investments (Due within one through three years) | | | | | | | | | Held to maturity debt securities | $ | 195,595 | | | $ | 1,151 | | | $ | (103) | | | $ | 196,643 | | | Held to maturity certificate of deposit | 50,000 | | | — | | | — | | | 50,000 | | | Total long-term investments | $ | 245,595 | | | $ | 1,151 | | | $ | (103) | | | $ | 246,643 | | | | | | | | | | | Marketable debt securities | $ | 127,481 | | | $ | — | | | $ | (753) | | | $ | 126,728 | | | | | | | | | |
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