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Short-Term Investments (Tables) | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Schedule of available for sale short-term investments | The following table represents the Company’s available for sale short-term investments by major security type (amounts in thousands):
| December 31, 2021
| Amortized Cost |  | Gross Unrealized Loss |  | Total Fair Value
Short-term investments: |  |  |  |  |
U.S. government securities | $ | 177,096 |  |  | $ | (560) |  |  | $ | 176,536 |
Total short-term investments | $ | 177,096 |  |  | $ | (560) |  |  | $ | 176,536 |
| December 31, 2020
| Amortized Cost |  | Gross Unrealized Loss |  | Total Fair Value
Short-term investments: |  |  |  |  |
U.S. government securities | $ | 177,614 |  |  | $ | (63) |  |  | $ | 177,551 |
Total short-term investments | $ | 177,614 |  |  | $ | (63) |  |  | $ | 177,551 |

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 + Details
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