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Income Taxes - Schedule of deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax asset:    
Net operating loss carryforwards $ 31,393 $ 24,867
Accrued expenses and other 1,827 3,578
Stock compensation 2,431 1,533
Credit carryforwards 13,614 10,101
Capital loss carryforwards 583 583
Capitalized R&D expense 27,210 15,017
Lease liabilities 882 1,030
Gross deferred tax asset 77,940 56,709
Less valuation allowance (76,386) (55,044)
Net deferred tax asset 1,554 1,665
Deferred tax liability:    
Depreciation and amortization (744) (676)
Prepaid expenses (334) (436)
Lease assets (476) (553)
Total deferred tax liability (1,554) (1,665)
Total net deferred tax asset $ 0 $ 0