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Marketable Securities | 12 Months Ended
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Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | 4 Marketable Securities The Company’s marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):
|  | December 31, 2021 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
U.S. Treasury securities |  | $ | 13,929 |  |  | $ | — |  |  | $ | (12 | ) |  | $ | 13,917 |
Corporate debt securities |  |  | 39,135 |  |  |  | — |  |  |  | (14 | ) |  |  | 39,121 |
Time deposits |  |  | 19,030 |  |  |  | — |  |  |  | — |  |  |  | 19,030 |
Total |  | $ | 72,094 |  |  | $ | — |  |  | $ | (26 | ) |  | $ | 72,068 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 4,017 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,017 |
Investments |  |  | 68,077 |  |  |  | — |  |  |  | (26 | ) |  |  | 68,051 |
Total |  | $ | 72,094 |  |  | $ | — |  |  | $ | (26 | ) |  | $ | 72,068 |
|  | December 31, 2020 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
Time deposits |  |  | 6,451 |  |  |  | — |  |  |  | — |  |  |  | 6,451 |
Total |  | $ | 6,451 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,451 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments |  |  | 6,451 |  |  |  | — |  |  |  | — |  |  |  | 6,451 |
Total |  | $ | 6,451 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,451 |
The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):
|  | December 31, 2021 |  |  | December 31, 2020 |
Due in one year or less |  | $ | 71,066 |  |  | $ | 6,451 |
Due after one year through three years |  |  | 1,002 |  |  |  | — |
Total |  | $ | 72,068 |  |  | $ | 6,451 |
Net realized gains and losses on sales of investments were not material in 2021, 2020 and 2019.

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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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