Consolidated Balance Sheets - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 13,824,258	$ 36,278,519
Short-term investments	120,263,581	80,164,823
Lease payments receivable – short term	76,208	73,091
Prepaid expenses	240,534	423,863
Total current assets	134,404,581	116,940,296
Fixed assets, net of accumulated depreciation	2,935	5,010
Other assets	25,000	25,000
Lease payments receivable – long term	126,935	165,834
Total assets	134,559,451	117,136,140
Current liabilities:
Accounts payable	965,169	522,663
Accrued expenses	1,360,933	824,936
Notes payable		110,247
Total current liabilities	2,326,102	1,457,846
Stockholders’ Equity:
Preferred stock
Common stock, $0.001 par value, 50,000,000 shares authorized, 15,851,853 and 14,457,013 shares issued and outstanding, respectively	15,852	14,457
Additional paid-in capital	273,868,163	235,522,746
Accumulated deficit	(141,650,666)	(119,858,909)
Total stockholders’ equity	132,233,349	115,678,294
Total liabilities and stockholders’ equity	134,559,451	117,136,140
Class A Convertible Preferred Stock
Stockholders’ Equity:
Preferred stock