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Cash, Cash Equivalents and Investments (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash, cash equivalents and investments [Abstract] |  |  |  |
Cash | $ 41,348,000 | $ 36,763,000 |  |
Cash equivalents [Abstract] |  |  |  |
Total cash, restricted cash and cash equivalents | 41,348,000 | 36,763,000 | $ 72,602,000 | $ 26,892,000
Amortized Cost | 11,760,000 | 15,060,000 |  |
Cash, cash equivalents and investments, amortized costs | 53,108,000 | 51,823,000 |  |
Gross Unrealized (Loss) | (303,000) | (65,000) |  |
Fair Value | 11,457,000 | 14,995,000 |  |
Cash, cash equivalents and investments, amortized costs | 52,805,000 | 51,758,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Due within 1 year | 9,600,000 | 5,424,000 |  |
Due after 1 through 5 years | 2,160,000 | 9,636,000 |  |
Investments, amortized cost | 11,760,000 | 15,060,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Due within 1 year | 9,339,000 | 5,419,000 |  |
Due after 1 through 5 years | 2,118,000 | 9,576,000 |  |
Investments, fair value | 11,457,000 | 14,995,000 |  |
Debt Securities, Available-for-sale, Unrealized Loss | 303,000 |  |  |
Investments |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 11,760,000 | 15,060,000 |  |
Gross Unrealized (Loss) | (303,000) | (65,000) |  |
Fair Value | 11,457,000 | 14,995,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 11,760,000 | 15,060,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | 11,457,000 | 14,995,000 |  |
Certificates of deposit. |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 6,440,000 | 6,680,000 |  |
Gross Unrealized (Loss) | (175,000) | (19,000) |  |
Fair Value | 6,265,000 | 6,661,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 6,440,000 | 6,680,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | 6,265,000 | 6,661,000 |  |
Corporate bonds |  |  |  |
Cash equivalents [Abstract] |  |  |  |
Amortized Cost | 5,320,000 | 8,380,000 |  |
Gross Unrealized (Loss) | (128,000) | (46,000) |  |
Fair Value | 5,192,000 | 8,334,000 |  |
Contractual maturities on investments, amortized cost basis [Abstract] |  |  |  |
Investments, amortized cost | 5,320,000 | 8,380,000 |  |
Contractual maturities on investments, fair value basis [Abstract] |  |  |  |
Investments, fair value | $ 5,192,000 | $ 8,334,000 |  |

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- Definition 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. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631418-115840 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56426-112766 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=118262064&loc=SL116631419-115840 + Details
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