Consolidated Balance Sheets (Unaudited) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 42,012,015	$ 104,790,989
Cash equivalent - reverse repurchase agreements	79,000,000	125,000,000
Marketable securities	75,677,040	0
Prepaid expenses and other current assets	4,052,355	2,961,781
Total current assets	200,741,410	232,752,770
Right-of-use assets	239,873	351,863
Fixed assets, net	34,041	32,487
Total assets	201,015,324	233,137,120
Current liabilities:
Accounts payable	264,225	1,019,702
Accrued expenses	10,810,155	10,523,353
Current portion of long-term debt	4,925,765	0
Current portion of operating lease liabilities	242,636	229,607
Total current liabilities	16,242,781	11,772,662
Operating lease liabilities, long-term	0	125,232
Long-term debt, net of current portion	10,743,535	15,503,703
Total liabilities	26,986,316	27,401,597
Commitments and contingencies (Notes 13, 14, and 15)
Stockholders' equity:
Preferred stock, $0.001 par value, 15,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.001 par value; 150,000,000 authorized and 58,301,491 and 58,081,215 shares issued and outstanding, respectively	58,301	58,081
Additional paid-in capital	503,517,715	500,369,444
Accumulated other comprehensive income	(285,763)	0
Accumulated deficit	(329,261,245)	(294,692,002)
Total stockholders’ equity	174,029,008	205,735,523
Total liabilities and stockholders’ equity	$ 201,015,324	$ 233,137,120