Condensed Consolidated Balance Sheets (unaudited) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 88,988,921	$ 9,211,057
Marketable securities	159,574,963	271,661,456
Account receivable	2,444,450
Other receivables	3,511,633	6,280,828
Prepaid expenses and other current assets	3,459,862	3,727,294
Total current assets	257,979,829	290,880,635
Property, equipment and leasehold improvements, net	11,712,403	8,455,411
Operating lease right of use assets	2,226,422	2,278,623
Other assets	28,777	26,757
Total assets	271,947,431	301,641,426
Current liabilities:
Accounts payable	5,088,034	4,556,827
Accrued expenses	12,143,734	7,602,904
Deferred revenue	21,358,989	19,979,525
Current portion of operating lease liability	939,761	673,896
Total current liabilities	39,530,518	32,813,152
Deferred revenue	23,945,470	38,427,882
Long term debt	2,000,000	2,000,000
Operating lease liability	1,351,476	1,714,111
Total liabilities	66,827,464	74,955,145
Commitments and Contingencies
Stockholders’ equity:
Common stock, $0.001 par value; 40,096,001 and 38,461,353 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively	40,096	38,461
Accumulated deficit	(450,342,422)	(372,556,846)
Additional paid-in capital	654,342,486	599,097,090
Accumulated other comprehensive income	1,079,807	107,576
Total stockholders’ equity	205,119,967	226,686,281
Total liabilities and stockholders’ equity	$ 271,947,431	$ 301,641,426