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FAIR VALUE ACCOUNTING (Tables)
6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
June 30, 2023Level 1Level 2Level 3Total
Cash equivalents(1)
$— $23,236 $— $23,236 
Investments accounted for at fair value17,366 — 17,373 
Marketable debt securities— 63,231 — 63,231 
Convertible note— — 59,206 59,206 
Marketable equity securities860 29 — 889 
$18,226 $86,503 $59,206 $163,935 
(1)     Cash equivalents are comprised of United States Treasury Bills and Government Agency Bonds purchased within three months of their maturity date.
December 31, 2022Level 1Level 2Level 3Total
Cash equivalents(1)
$— $30,336 $— $30,336 
Investments accounted for at fair value19,263 66 — 19,329 
Marketable debt securities— 11,125 — 11,125 
Marketable equity securities1,033 34 — 1,067 
$20,296 $41,561 $— $61,857 
(1)     Cash equivalents are comprised of United States Treasury Bills and Government Agency Bonds purchased within three months of their maturity date.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The following table is a reconciliation of the beginning and ending balance recorded for the Convertible Note classified as Level 3 in the fair value hierarchy.
Beginning balance, February 14, 2023$59,457 
Unrealized loss included in other income (loss)(251)
Ending balance, June 30, 2023$59,206 
As of June 30, 2023, the difference between the fair value of the Convertible Note and the unpaid principal amount is $0.79 million.