Consolidated Balance Sheets - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 5,838,566	$ 11,492,841
Investment in debt securities - available for sale, at fair value	9,857,087	21,254,485
Accrued interest receivable on investment securities		128,932
Money market investments, restricted cash		1,500,000
Advances and deposits on clinical programs and other current assets	2,545,051	2,403,433
Total current assets	18,240,704	36,779,691
Property and equipment (at cost, less accumulated depreciation and amortization)	751,906	548,301
Other assets:
Money market investments, restricted cash		4,500,000
Deferred income tax asset	1,280,385	1,567,026
Operating lease right-of-use assets, net	1,595,074	155,876
Deposits and other assets	50,000	425,000
Total other assets	2,925,459	6,647,902
Total assets	21,918,069	43,975,894
Current liabilities:
Accounts payable – trade	3,515,192	3,586,623
Other accrued liabilities	3,390,521	4,794,936
Notes payable – current portion, net of deferred financing costs		1,424,774
Operating lease liabilities - current portion	485,421	230,749
Total current liabilities	7,391,134	10,037,082
Notes payable – non-current portion, net of deferred financing costs		4,610,946
Operating lease liabilities - non-current portion	1,139,293
Total liabilities	8,530,427	14,648,028
Commitments and contingencies
Stockholders’ equity:
Preferred Stock - $0.01 par value (100,000 shares authorized, and no shares issued or outstanding at December 31, 2023 and 2022)
Common stock - $0.01 par value (112,500,000 shares authorized; 9,399,811 and 7,436,219 shares issued at December 31, 2023 and 2022, respectively, and 9,399,789 and 7,436,197 shares outstanding at December 31, 2023 and 2022, respectively)	93,998	74,362
Additional paid-in capital	401,500,838	397,980,023
Accumulated other comprehensive income	60,796	26,494
Accumulated deficit	(388,182,802)	(368,667,825)
Total stockholders’ equity before treasury stock	13,472,830	29,413,054
Treasury stock, at cost (22 shares at December 31, 2023 and 2022)	(85,188)	(85,188)
Total stockholders’ equity	13,387,642	29,327,866
Total liabilities and stockholders’ equity	$ 21,918,069	$ 43,975,894