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MARKETABLE SECURITIES
6 Months Ended
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 BasisGross Unrealized LossesGross Unrealized GainsFair Value
Marketable debt securities(1)
$11,435 $— $$11,440 
Marketable equity securities756 (401)— 355 
Total marketable securities $12,191 $(401)$$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 BasisGross Unrealized LossesGross Unrealized GainsFair Value
Marketable equity securities$756 $(262)$— $494