Cash Equivalents and Investments (Tables) |
12 Months Ended |
|---|---|
Dec. 31, 2021 | |
| Cash Equivalents and Investments [Abstract] | |
| Schedule of Cash Equivalents and Available-for-Sale Securities | December 31, 2021 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Short-Term Investments Long-Term InvestmentsCash equivalents: Money Market funds$ 855,000 $ — $ — $ 855,000 $ 855,000 $ — $ —Subtotal 855,000 — — 855,000 855,000 — — Investments: Corporate Notes/Bonds 2,919,000 — (15,000) 2,904,000 — 135,000 2,769,000Convertible Debt 250,000 — — 250,000 — — 250,000Subtotal 3,169,000 — (15,000) 3,154,000 — 135,000 3,019,000 Total$ 4,024,000 $ — $ (15,000) $ 4,009,000 $ 855,000 $ 135,000 $ 3,019,000 December 31, 2020 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Cash Equivalents Short-Term Investments Long-Term InvestmentsCash equivalents: Money Market funds$ 9,424,000 $ — $ — $ 9,424,000 $ 9,424,000 $ — $ —Subtotal 9,424,000 — — 9,424,000 9,424,000 — — Investments: Commercial Paper 700,000 — — 700,000 — 700,000 —Corporate Notes/Bonds 7,658,000 7,000 (1,000) 7,664,000 — 2,059,000 5,605,000Convertible Debt 605,000 — — 605,000 — — 605,000Subtotal 8,963,000 7,000 (1,000) 8,969,000 — 2,759,000 6,210,000 Total$ 18,387,000 $ 7,000 $ (1,000) $ 18,393,000 $ 9,424,000 $ 2,759,000 $ 6,210,000 |
| Schedule of Estimated Fair Value of Available-for-Sale Securities | Amortized Cost EstimatedMarket ValueDue within one year $ 135,000 $ 135,000Due after one year through five years 3,034,000 3,019,000 $ 3,169,000 $ 3,154,000 |