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Short-Term Investments | 9 Months Ended
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Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract] |
Short-Term Investments | Short-Term Investments The following table represents the Company’s available for sale short-term investments by major security type (amounts in thousands):
| September 30, 2021
| Amortized Cost |  | Gross Unrealized Loss |  | Total Fair Value
Short-term investments |  |  |  |  |
U.S. government securities | $ | 206,948 |  |  | $ | (1,827) |  |  | $ | 205,121 |
Total short-term investments | $ | 206,948 |  |  | $ | (1,827) |  |  | $ | 205,121 |
| 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 |
The Company’s short-term investment instruments and cash and cash equivalents are classified using Level 1 inputs within the fair value hierarchy and are valued using quoted market prices, broker or dealer quotations, or alternative pricing sources with reasonable levels of price transparency. Debt securities as of September 30, 2021 have an average maturity of 0.48 years.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1403 -Paragraph (b) + Details
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