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Cash, Cash Equivalents and Investments (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash, cash equivalents and investments [Abstract] |  |  |  |
Cash and restricted cash | $ 50,114,000 | $ 41,348,000 |  |
Cash equivalents [Abstract] |  |  |  |
Total cash, restricted cash and cash equivalents | 50,114,000 | 41,348,000 | $ 36,763,000 | $ 72,602,000
Amortized Cost | 2,160,000 | 11,760,000 |  |
Cash, restricted cash, cash equivalents and investments, amortized costs | 52,274,000 | 53,108,000 |  |
Gross Unrealized (Loss) | (20,000) | (303,000) |  |
Fair Value | 2,140,000 | 11,457,000 |  |
Cash, restricted cash, cash equivalents and investments, fair value. | 52,254,000 | 52,805,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Due within 1 year | 2,160,000 | 9,600,000 |  |
Due after 1 through 5 years |  | 2,160,000 |  |
Investments, amortized cost | 2,160,000 | 11,760,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Due within 1 year | 2,140,000 | 9,339,000 |  |
Due after 1 through 5 years |  | 2,118,000 |  |
Investments, fair value | 2,140,000 | 11,457,000 |  |
Debt Securities, Available-for-sale, Unrealized Loss | 20,000 |  |  |
Impairment charge | 1,900,000 | 0 | $ 0 |
Investments. |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 2,160,000 | 11,760,000 |  |
Gross Unrealized (Loss) | (20,000) | (303,000) |  |
Fair Value | 2,140,000 | 11,457,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 2,160,000 | 11,760,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | 2,140,000 | 11,457,000 |  |
Certificates of deposit. |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 2,160,000 | 6,440,000 |  |
Gross Unrealized (Loss) | (20,000) | (175,000) |  |
Fair Value | 2,140,000 | 6,265,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 2,160,000 | 6,440,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | $ 2,140,000 | 6,265,000 |  |
Corporate bonds |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost |  | 5,320,000 |  |
Gross Unrealized (Loss) |  | (128,000) |  |
Fair Value |  | 5,192,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost |  | 5,320,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value |  | $ 5,192,000 |  |

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482913/230-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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