XML 115 R37.htm IDEA: XBRL DOCUMENT v3.23.2
Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Cash and Cash Equivalents [Line Items]    
Adjusted Cost $ 25,198,000 $ 59,894,000
Unrealized Gain/(Loss) (3,590,000) (3,659,000)
Fair Value 21,608,000 46,776,000
Cash and Cash Equivalents 10,033,000 19,290,000
Current marketable securities 11,575,000 27,307,000
Investments   179,000
Fair Value, Inputs, Level 2 [Member] | Convertible Securities [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost   1,023,000
Unrealized Gain/(Loss)  
Fair Value   39,000
Cash and Cash Equivalents  
Current marketable securities  
Investments   39,000
Fair Value, Inputs, Level 2 [Member] | Warrant [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost   3,318,000
Unrealized Gain/(Loss)  
Fair Value   140,000
Cash and Cash Equivalents  
Current marketable securities  
Investments   140,000
Cash [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 9,971,000 19,226,000
Unrealized Gain/(Loss)
Fair Value 9,971,000 19,226,000
Cash and Cash Equivalents 9,971,000 19,226,000
Current marketable securities
Investments  
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 62,000 64,000
Unrealized Gain/(Loss)
Fair Value 62,000 64,000
Cash and Cash Equivalents 62,000 64,000
Current marketable securities
Investments  
Marketable Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Cash and Cash Equivalents [Line Items]    
Adjusted Cost 15,165,000 36,263,000
Unrealized Gain/(Loss) (3,590,000) (3,659,000)
Fair Value 11,575,000 27,307,000
Cash and Cash Equivalents
Current marketable securities $ 11,575,000 27,307,000
Investments