Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Current assets:
Cash and cash equivalents	$ 2,871,756	$ 5,872,767
Advances and deposits on clinical programs and other current assets	2,220,200	2,136,192
Total current assets	5,091,956	8,008,959
Property and equipment (at cost, less accumulated depreciation and amortization)	734,243	541,272
Other assets:
Operating lease right-of-use assets, net	985,887	1,117,133
Deposits and other assets	50,000	50,000
Total other assets	1,035,887	1,167,133
Total assets	6,862,086	9,717,364
Current liabilities:
Accounts payable – trade	1,858,602	1,300,026
Other accrued liabilities	3,543,407	3,033,747
Operating lease liability - current portion	394,878	452,358
Total current liabilities	5,796,887	4,786,131
Operating lease liability - non-current portion	613,171	686,935
Total liabilities	6,410,058	5,473,066
Commitments and contingencies
Stockholders’ equity:
Preferred stock - $0.01 par value (100,000 shares authorized, and no shares issued or outstanding at March 31, 2025 and December 31, 2024
Common stock - $0.01 par value (112,500,000 shares authorized; 14,620,754 and 14,500,707 shares issued at March 31, 2025 and December 31, 2024, respectively; and 14,620,732 and 14,500,685 shares outstanding at March 31, 2025 and December 31, 2024, respectively)	146,207	145,007
Additional paid-in capital	411,296,548	410,987,523
Accumulated deficit	(410,905,539)	(406,803,044)
Total stockholders’ equity before treasury stock	537,216	4,329,486
Treasury stock, at cost (22 shares at March 31, 2025 and December 31, 2024)	(85,188)	(85,188)
Total stockholders’ equity	452,028	4,244,298
Total liabilities and stockholders’ equity	$ 6,862,086	$ 9,717,364

Carrying value as of the balance sheet date of obligations incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).