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MARKETABLE SECURITIES | 6 Months Ended
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Jun. 30, 2022
Cash and Cash Equivalents [Abstract] |
Marketable Securities | MARKETABLE SECURITIES For marketable debt securities, we have elected the fair value option for which changes in fair value are recorded in Other loss in the Condensed Consolidated Statement of Operations and Comprehensive Loss. The fair value option was elected for these securities as after consideration of our risks versus reward objectives, as well as our liquidity requirements, we may sell these debt securities prior to their stated maturities. The stated contractual maturity dates of marketable debt securities held as of June 30, 2022 are due between one and two years. No marketable debt securities were held as of December 31, 2021. The following table summarizes our marketable securities by significant investment categories as of June 30, 2022:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable debt securities(1) | $ | 11,435 |  | $ | — |  | $ | 5 |  | $ | 11,440 |
Marketable equity securities | 756 |  | (401) |  | — |  | 355 |
Total marketable securities | $ | 12,191 |  | $ | (401) |  | $ | 5 |  | $ | 11,795 |
(1) Marketable debt securities are comprised primarily of notes of U.S. government agency bonds. The following table summarizes our marketable securities by significant investment categories as of December 31, 2021:
| Cost Basis | Gross Unrealized Losses | Gross Unrealized Gains | Fair Value
Marketable equity securities | $ | 756 |  | $ | (262) |  | $ | — |  | $ | 494 |

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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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