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Income Taxes (Components of Deferred Tax Assets) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Deferred Tax Assets, Net [Abstract] |  |
Net operating loss carry-forwards | $ 46,591 | $ 42,525
Capitalized research and development | 21,431 | 19,103
Stock-based compensation | 2,083 | 3,192
Depreciation and amortization | 856 | 929
Lease accounting | 13,899 | 13,660
Other | 1,907 | 1,452
Total deferred tax assets before valuation allowance | 86,767 | 80,861
Less: valuation allowance | (75,166) | (68,818)
Total deferred tax assets after valuation allowance | 11,601 | 12,043
Deferred Tax Liabilities, Net [Abstract] |  |
Right-of-use asset | (11,510) | (12,043)
In-process research and development | (3,077) | (3,077)
Other | (91) |
Total deferred tax liabilities | 14,678 | 15,120
Net deferred tax liability | $ (3,077) | $ (3,077)

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