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Condensed Consolidated Balance Sheets - USD ($)
Jun. 30, 2023
Dec. 31, 2022
Current assets:    
Cash and cash equivalents $ 71,623,256 $ 44,867,846
Marketable securities 24,894,144 84,133,565
Prepaid expenses and other current assets 5,653,465 2,379,280
Total current assets 102,170,865 131,380,691
Long-term equity investments 16,470,542 5,622,547
Restricted cash 1,930,753 1,930,753
Right-of-use asset, net 14,412,068 14,922,669
Property and equipment, net 955,569 1,147,963
Other assets 289,967 261,191
Total assets 136,229,764 155,265,814
Current liabilities:    
Accounts payable 3,763,289 1,952,910
Accrued expenses 5,433,290 4,504,669
Current portion, lease liability 944,943 533,946
Total current liabilities 10,141,522 6,991,525
Long-term liabilities:    
Lease liability 15,389,567 16,001,725
Total liabilities 25,531,089 22,993,250
Stockholders' equity:    
Preferred stock, $0.001 par value; 10,000,000 shares authorized; Series A convertible preferred stock, 10,000 shares designated, 1,250 shares issued and outstanding at June 30, 2023 and December 31, 2022 1 1
Common stock, $0.001 par value; 125,000,000 shares authorized; 70,602,793 and 70,466,885 shares issued and outstanding at June 30, 2023 and December 31, 2022, respectively 70,603 70,467
Additional paid-in-capital 361,913,944 357,770,825
Accumulated other comprehensive income (loss) 5,208 (42,187)
Accumulated deficit (251,291,081) (225,526,542)
Total stockholders' equity 110,698,675 132,272,564
Total liabilities and stockholders' equity $ 136,229,764 $ 155,265,814