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Components of Deferred Income Taxes (Detail) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Net operating loss carryforwards $ 71,161,394 $ 69,980,468
Research tax credits 9,173,787 10,034,233
Stock options 938,846 1,497,450
Other, net 269,439 355,204
Right-of-use liability 106,148 166,832
Research and experimentation capitalization 3,985,733 2,626,585
Total deferred tax assets 85,635,347 84,660,772
Deferred tax liabilities    
Right-of-use asset (94,000) (152,511)
In-process research and development (1,343,213) (1,343,213)
Total deferred tax liabilities (1,437,213) (1,495,724)
Net deferred tax assets 84,198,134 83,165,048
Valuation allowance (84,399,926) (83,366,840)
Net deferred tax liability $ (201,792) $ (201,792)