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Cash, Cash Equivalents and Restricted Cash (Tables) | 6 Months Ended
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Jun. 30, 2024
Cash and Cash Equivalents [Abstract] |
Schedule of cash and cash equivalents | Cash, cash equivalents and restricted cash as of December 31, 2023 and June 30, 2024 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | June 30,
​ | ​ | 2023 | ​ | 2024
Current assets: |  | ​ |  |  | ​ |
Cash and cash equivalents | ​ | $ | 104,944 | ​ | $ | 123,092
Restricted cash - standby letter of credit | ​ |  | 2,019 | ​ |  | 2,050
Total cash, cash equivalents and current portion of restricted cash | ​ | $ | 106,963 | ​ | $ | 125,142
​ | ​ | ​ | ​ | ​ | ​ | ​
Total cash, cash equivalents and restricted cash | ​ | $ | 106,963 | ​ | $ | 125,142
Schedule of components of restricted cash | Cash, cash equivalents and restricted cash as of December 31, 2023 and June 30, 2024 consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, |  | June 30,
​ | ​ | 2023 | ​ | 2024
Current assets: |  | ​ |  |  | ​ |
Cash and cash equivalents | ​ | $ | 104,944 | ​ | $ | 123,092
Restricted cash - standby letter of credit | ​ |  | 2,019 | ​ |  | 2,050
Total cash, cash equivalents and current portion of restricted cash | ​ | $ | 106,963 | ​ | $ | 125,142
​ | ​ | ​ | ​ | ​ | ​ | ​
Total cash, cash equivalents and restricted cash | ​ | $ | 106,963 | ​ | $ | 125,142

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- Definition Tabular disclosure of cash and cash equivalents restricted as to withdrawal or usage. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 8 -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 + Details
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