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Other Financial Information - Accrued and other current liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Other Financial Information [Abstract] |  |
Accrued payroll and related expenses | $ 2,900 | $ 4,048
Accrued interest | 136 | 139
Accrued purchases of goods and services | 1,040 | 510
Accrued royalties | 124 | 180
Accrued clinical study activity | 158 | 254
Finance lease liabilities - current | 679 | 587
Other accrued liabilities | 452 | 1,108
Accrued and other current liabilities | $ 5,970 | $ 6,826

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