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Investments | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Investments | Note 4. Investments The following tables summarize the Company’s investments accounted for as available-for-sale securities (in thousands, except years):
|  | December 31, 2021 |
|  | Maturity |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | (in years) |  | cost |  |  | losses |  |  | gains |  |  | fair value |
US treasury securities |  | 1 or less |  | $ | 18,116 |  |  | $ | (19 | ) |  | $ | — |  |  |  | 18,097 |
Corporate debt securities |  | 1 or less |  |  | 2,824 |  |  |  | (2 | ) |  |  | — |  |  |  | 2,822 |
Commercial paper |  | 1 or less |  |  | 31,566 |  |  |  | — |  |  |  | — |  |  |  | 31,566 |
Supranational debt securities |  | 1 or less |  |  | 1,503 |  |  |  | — |  |  |  | — |  |  |  | 1,503 |
US treasury securities |  | 1-2 |  |  | 44,911 |  |  |  | (141 | ) |  |  |  |  |  | 44,770 |
Total |  |  |  | $ | 98,920 |  |  | $ | (162 | ) |  | $ | — |  |  | $ | 98,758 |
|  | December 31, 2020 |
|  | Maturity |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
|  | (in years) |  | cost |  |  | losses |  |  | gains |  |  | fair value |
US treasury securities |  | 1 or less |  | $ | 38,489 |  |  | $ | — |  |  | $ | 3 |  |  | $ | 38,492 |
Corporate debt securities |  | 1 or less |  |  | 3,794 |  |  |  | (1 | ) |  |  | — |  |  |  | 3,793 |
Commercial paper |  | 1 or less |  |  | 11,040 |  |  |  | — |  |  |  | — |  |  |  | 11,040 |
Total |  |  |  | $ | 53,323 |  |  | $ | (1 | ) |  | $ | 3 |  |  | $ | 53,325 |
As of December 31, 2021, there were 19 available-for-sale securities with an estimated fair value of $68.0 million in gross unrealized loss positions. As of December 31, 2020, there were six available-for-sale securities with an estimated fair value of $15.8 million in gross unrealized loss positions. None had been in such position for greater than 12 months. Based on the Company’s review of its investments, the Company believes that the unrealized losses were not other-than-temporary as of December 31, 2021 and 2020.

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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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