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MARKETABLE SECURITIES
 3 Months Ended
Mar. 31, 2023
Cash and Cash Equivalents [Abstract]  
Marketable Securities MARKETABLE SECURITIES
The Company elected the fair value option for its marketable debt securities and convertible note for which changes in fair value are recorded in Other income (loss) in the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss). The fair value option was elected for these marketable debt securities, as the Company may sell them prior to their stated maturities after consideration of the Company's risk versus reward objectives, as well as its liquidity requirements. The stated contractual maturity dates of marketable debt securities held as of March 31, 2023 and December 31, 2022 are due in one to two years. The convertible note was received as a partial consideration for the Alta Mesa Transaction (defined in Note 5 – Property, Plant and Equipment and Mineral Properties). The Company elected the fair value option for the secured convertible note (the “Convertible Note”), as it has the option of converting into common shares of enCore Energy Corp. (“enCore”). Marketable equity securities are measured at fair value as of each reporting date, and unrealized gains (losses) are recorded in Other income (loss) in the Condensed Consolidated Statements of Operations and Comprehensive Income (Loss).
The following table summarizes our marketable securities by significant investment categories as of March 31, 2023:

 Cost BasisGross Unrealized LossesGross Unrealized GainsFair Value
Marketable debt securities(1)
$59,359 $— $72 $59,431 
Convertible note(2)
59,457 (198)— 59,259 
Marketable equity securities2,876 (1,869)— 1,007 
Total marketable securities $121,692 $(2,067)$72 $119,697 
(1)     Marketable debt securities are comprised primarily of U.S. government agency bonds.
(2)     The Convertible note was received as consideration in the Alta Mesa Transaction (defined in Note 5 – Property, Plant and Equipment and Mineral Properties) and is valued using a binomial lattice model using Level 3 inputs. See Note 5 – Property, Plant and Equipment and Mineral Properties and Note 13 – Fair Value Accounting for more information.
The following table summarizes our marketable securities by significant investment categories as of December 31, 2022:

 Cost BasisGross Unrealized LossesGross Unrealized GainsFair Value
Marketable debt securities(1)
$11,435 $(310)$— $11,125 
Marketable equity securities2,876 (1,809)— 1,067 
Total marketable securities$14,311 $(2,119)$— $12,192 
(1)     Marketable debt securities are comprised primarily of U.S. government agency bonds.