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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2021
Investments, All Other Investments [Abstract] |
Schedule of Cash and Marketable Securities by Significant Investment Category | The following tables show the Company’s cash and cash equivalents and marketable securities by significant investment category as of March 31, 2021 and December 31, 2020:
|  | 2021 |
|  | Adjusted Cost |  |  | Unrealized Gain/(Loss) |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Current Marketable Securities |  |  | Investments |
Cash and cash equivalents |  | $ | 20,140,000 |  |  | $ | - |  |  | $ | 20,140,000 |  |  | $ | 20,140,000 |  |  | $ | - |  |  | $ | - |
Level 1 |  |  |  |  |  |  | - |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  |  | 31,921,000 |  |  |  | - |  |  |  | 31,921,000 |  |  |  | 31,921,000 |  |  |  | - |  |  |  | - |
Marketable Securities |  |  | 7,769,000 |  |  |  | 2,316,000 |  |  |  | 10,085,000 |  |  |  | - |  |  |  | 10,085,000 |  |  |  | - |
Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  | 700,000 |  |  |  | 471,000 |  |  |  | 1,171,000 |  |  |  | - |  |  |  | - |  |  |  | 1,171,000 |
Total |  | $ | 60,530,000 |  |  | $ | 2,787,000 |  |  | $ | 63,317,000 |  |  | $ | 52,061,000 |  |  | $ | 10,085,000 |  |  | $ | 1,171,000 |
|  | 2020 |
|  | Adjusted Cost |  |  | Unrealized Gain/(Loss) |  |  | Fair Value |  |  | Cash and Cash Equivalents |  |  | Current Marketable Securities |  |  | Investment |
Cash and cash equivalents |  | $ | 1,733,000 |  |  | $ | - |  |  | $ | 1,733,000 |  |  | $ | 1,733,000 |  |  | $ | - |  |  | $ | - |
Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money Market Funds |  |  | 3,493,000 |  |  |  | - |  |  |  | 3,493,000 |  |  |  | 3,493,000 |  |  |  | - |  |  |  | - |
Marketable Securities |  |  | 5,641,000 |  |  |  | 3,495,000 |  |  |  | 9,136,000 |  |  |  | - |  |  |  | 9,136,000 |  |  |  | - |
Level 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants |  |  | 700,000 |  |  |  | 356,000 |  |  |  | 1,056,000 |  |  |  | - |  |  |  | - |  |  |  | 1,056,000 |
Total |  | $ | 11,567,000 |  |  | $ | 3,851,000 |  |  | $ | 15,418,000 |  |  | $ | 5,226,000 |  |  | $ | 9,136,000 |  |  | $ | 1,056,000 |

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