Condensed Consolidated Balance Sheets - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 63,051,928	$ 44,867,846
Marketable securities	54,668,093	84,133,565
Prepaid expenses and other current assets	1,799,343	2,379,280
Total current assets	119,519,364	131,380,691
Long-term equity investments	5,982,452	5,622,547
Restricted cash	1,930,253	1,930,753
Right-of-use asset, net	14,669,362	14,922,669
Property and equipment, net	1,053,063	1,147,963
Other assets	212,510	261,191
Total assets	143,367,004	155,265,814
Current liabilities:
Accounts payable	1,831,490	1,952,910
Accrued expenses	4,085,369	4,504,669
Current portion, lease liability	804,139	533,946
Total current liabilities	6,720,998	6,991,525
Long-term liabilities:
Lease liability	15,698,324	16,001,725
Total liabilities	22,419,322	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 March 31, 2023 and December 31, 2022	1	1
Common stock, $0.001 par value; 125,000,000 shares authorized; 70,491,510 and 70,466,885 shares issued and outstanding at March 31, 2023 and December 31, 2022, respectively	70,492	70,467
Additional paid-in-capital	359,754,310	357,770,825
Accumulated other comprehensive income (loss)	5,630	(42,187)
Accumulated deficit	(238,882,751)	(225,526,542)
Total stockholders' equity	120,947,682	132,272,564
Total liabilities and stockholders' equity	$ 143,367,004	$ 155,265,814