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Cash, Cash Equivalents and Short-Term Investments (Details) - Schedule of unrealized gains and losses related to short-term investments - USD ($) | Mar. 31, 2022 | Dec. 31, 2021
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Amortized Cost [Member] |  |
Short-term investments: |  |
Total short-term investments | $ 9,277,000 | $ 15,932,000
Amortized Cost [Member] | Certificates of Deposit [Member] |  |
Short-term investments: |  |
Total short-term investments | 249,000 | 250,000
Amortized Cost [Member] | Commercial Paper [Member] |  |
Short-term investments: |  |
Total short-term investments | 548,000 | 2,210,000
Amortized Cost [Member] | Corporate Notes [Member] |  |
Short-term investments: |  |
Total short-term investments | 8,028,000 | 12,035,000
Amortized Cost [Member] | Municipal Bonds [Member] |  |
Short-term investments: |  |
Total short-term investments | 452,000 | 1,437
Gross Unrealized Gains [Member] |  |
Short-term investments: |  |
Total short-term investments |  |
Gross Unrealized Gains [Member] | Certificates of Deposit [Member] |  |
Short-term investments: |  |
Total short-term investments |  |
Gross Unrealized Gains [Member] | Commercial Paper [Member] |  |
Short-term investments: |  |
Total short-term investments |  |
Gross Unrealized Gains [Member] | Corporate Notes [Member] |  |
Short-term investments: |  |
Total short-term investments |  |
Gross Unrealized Gains [Member] | Municipal Bonds [Member] |  |
Short-term investments: |  |
Total short-term investments |  |
Gross Unrealized Losses [Member] |  |
Short-term investments: |  |
Total short-term investments | (30,000) | (11,000)
Gross Unrealized Losses [Member] | Certificates of Deposit [Member] |  |
Short-term investments: |  |
Total short-term investments |  |
Gross Unrealized Losses [Member] | Commercial Paper [Member] |  |
Short-term investments: |  |
Total short-term investments |  |
Gross Unrealized Losses [Member] | Corporate Notes [Member] |  |
Short-term investments: |  |
Total short-term investments | (30,000) | (11,000)
Gross Unrealized Losses [Member] | Municipal Bonds [Member] |  |
Short-term investments: |  |
Total short-term investments |  |
Aggregate Estimated Fair Value [Member] |  |
Short-term investments: |  |
Total short-term investments | 9,247,000 | 15,921,000
Aggregate Estimated Fair Value [Member] | Certificates of Deposit [Member] |  |
Short-term investments: |  |
Total short-term investments | 249,000 | 250,000
Aggregate Estimated Fair Value [Member] | Commercial Paper [Member] |  |
Short-term investments: |  |
Total short-term investments | 548,000 | 2,210,000
Aggregate Estimated Fair Value [Member] | Corporate Notes [Member] |  |
Short-term investments: |  |
Total short-term investments | 7,998,000 | 12,024,000
Aggregate Estimated Fair Value [Member] | Municipal Bonds [Member] |  |
Short-term investments: |  |
Total short-term investments | $ 452,000 | $ 1,437,000

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