Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 183,876,453	$ 219,966,167
Prepaid and other current assets	148,373	413,095
Total current assets	184,024,826	220,379,262
Equipment, net	52,647	30,623
Right-of-use asset - operating lease	1,739,475
Other assets	317,375	139,875
Total assets	186,134,323	220,549,760
Current liabilities:
Accounts payable	13,504,022	10,943,325
Accrued expenses and other current liabilities	8,713,249	10,949,128
Operating lease liability, current portion	1,220,587
Loan payable, current portion		2,602,292
Total current liabilities	23,437,858	24,494,745
Loan payable, long-term	48,321,848	17,332,626
Operating lease liability, long-term	581,708
Total liabilities	72,341,414	41,827,371
Stockholders’ equity:
Preferred stock, $0.0001 par value per share (10,000,000 shares authorized, none issued and outstanding at December 31, 2020 and December 31, 2019, respectively)
Common stock, $0.0001 par value per share (150,000,000 shares authorized, 37,374,088 and 36,933,217 shares issued and outstanding at December 31, 2020 and December 31, 2019, respectively)	3,737	3,693
Additional paid-in capital	392,585,265	354,614,189
Accumulated deficit	(278,796,093)	(175,895,493)
Total stockholders’ equity	113,792,909	178,722,389
Total liabilities and stockholders’ equity	$ 186,134,323	$ 220,549,760