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Short-Term and Long-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Summary of Investment | Details of our investments are as follows (in thousands):
|  | December 31, 2021 |
|  | Cash and Cash Equivalents |  |  | Short-Term Investments |  |  | Long-Term Investments |
Measured at fair value: |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 94,282 |  |  | $ | — |  |  | $ | — |
U.S. Treasury Obligations |  |  | — |  |  |  | 45,215 |  |  |  | — |
Failed Auction Security |  |  | — |  |  |  | — |  |  |  | 2,639 |
Total |  |  | 94,282 |  |  |  | 45,215 |  |  |  | 2,639 |
Other measurement basis: |  |  |  |  |  |  |  |  |  |  |  |
Cash on hand |  |  | 88,136 |  |  |  | — |  |  |  | — |
Total |  | $ | 182,418 |  |  | $ | 45,215 |  |  | $ | 2,639 |
|  | December 31, 2020 |
|  | Cash and Cash Equivalents |  |  | Short-Term Investments |  |  | Long-Term Investments |
Measured at fair value: |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities: |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  | $ | 69,493 |  |  | $ | — |  |  | $ | — |
U.S. Treasury Obligations |  |  | 19,998 |  |  |  | 50,166 |  |  |  | — |
Failed Auction Security |  |  | — |  |  |  | — |  |  |  | 2,517 |
Total |  |  | 89,491 |  |  |  | 50,166 |  |  |  | 2,517 |
Other measurement basis: |  |  |  |  |  |  |  |  |  |  |  |
Cash on hand |  |  | 72,251 |  |  |  | — |  |  |  | — |
Total |  | $ | 161,742 |  |  | $ | 50,166 |  |  | $ | 2,517 |
Summary of Available-for-Sale Securities | The following is a summary of the available-for-sale securities (in thousands):
December 31, 2021 |  | Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
U.S. Treasury Obligations |  | $ | 45,238 |  |  | $ | — |  |  | $ | 23 |  |  | $ | 45,215 |
Failed Auction Security |  |  | 3,000 |  |  |  | — |  |  |  | 361 |  |  |  | 2,639 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury Obligations |  | $ | 70,172 |  |  | $ | — |  |  | $ | 8 |  |  | $ | 70,164 |
Failed Auction Security |  |  | 3,000 |  |  |  | — |  |  |  | 483 |  |  |  | 2,517 |
Cost and Estimated Fair Value of Failed Auction Security by Contractual Maturities | The amortized cost and estimated fair value of the available-for-sale securities on December 31, 2021, by type and contractual maturities, are shown below (in thousands):
U.S. Treasury Obligations: |  |  |  |  |  |  |  |
|  | Cost |  |  | Estimated Fair Value |
Maturities greater than three months but less than one year |  | $ | 45,238 |  |  | $ | 45,215 |
Failed Auction Security: |  |  |  |  |  |  |  |
|  | Cost |  |  | Estimated Fair Value |
Due in twenty to forty years |  | $ | 3,000 |  |  | $ | 2,639 |

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