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CONSOLIDATED BALANCE SHEETS - USD ($)
Sep. 30, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 21,862,581 $ 4,823,544
Short-term investment securities 8,544,815 29,399,146
Interest receivable 106,405 329,711
Accounts receivable 806,847 558,530
Income tax receivable 0 250,308
Prepaid expenses and other current assets 419,498 277,999
Total current assets 31,740,146 35,639,238
Non-current assets:    
Long-term investment securities 0 1,511,636
Long-term income tax receivable 0 250,308
Other assets 5,558 51,314
Total assets 31,745,704 37,452,496
Current liabilities:    
Accounts payable 976,762 943,378
Accrued expenses 620,633 566,003
Deferred research and development obligations 153,855 78,644
Total current liabilities 1,751,250 1,588,025
Commitments and contingencies (Note 4)
Stockholders’ equity:    
Preferred stock 0 0
Common stock 39,736 39,613
Additional paid-in capital 97,600,771 96,105,851
Treasury stock, shares held at cost (18,929,915) (18,929,915)
Accumulated deficit (48,716,138) (41,351,078)
Total stockholders’ equity 29,994,454 35,864,471
Total liabilities and stockholders’ equity $ 31,745,704 $ 37,452,496