Schedule of Cash and Marketable Securities by Significant Investment Category (Details) - USD ($)	6 Months Ended	12 Months Ended
Jun. 30, 2021	Dec. 31, 2020
Compensating Balances [Line Items]
Adjusted Cost	$ 86,029,000	$ 11,524,000
Unrealized Gain/(Loss)	(3,525,000)	3,851,000
Fair Value	82,504,000	15,375,000
Cash and Cash Equivalents	65,645,000	5,183,000
Current Marketable Securities	7,319,000	9,136,000
Investments	9,540,000	1,056,000
Fair Value, Inputs, Level 2 [Member] \| Warrant [Member]
Compensating Balances [Line Items]
Adjusted Cost	15,657,000	700,000
Unrealized Gain/(Loss)	(6,117,000)	356,000
Fair Value	9,540,000	1,056,000
Cash and Cash Equivalents
Current Marketable Securities
Investments	9,540,000	1,056,000
Cash and Cash Equivalents [Member]
Compensating Balances [Line Items]
Adjusted Cost	6,497,000	1,690,000
Unrealized Gain/(Loss)
Fair Value	6,497,000	1,690,000
Cash and Cash Equivalents	6,497,000	1,690,000
Current Marketable Securities
Investments
Money Market Funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Compensating Balances [Line Items]
Adjusted Cost	59,148,000	3,493,000
Unrealized Gain/(Loss)
Fair Value	59,148,000	3,493,000
Cash and Cash Equivalents	59,148,000	3,493,000
Current Marketable Securities
Investments
Marketable Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Compensating Balances [Line Items]
Adjusted Cost	4,727,000	5,641,000
Unrealized Gain/(Loss)	2,592,000	3,495,000
Fair Value	7,319,000	9,136,000
Cash and Cash Equivalents
Current Marketable Securities	7,319,000	9,136,000
Investments
Cash Equivalents [Member]
Compensating Balances [Line Items]
Cash and Cash Equivalents	$ 65,645,000	$ 5,183,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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