Consolidated Balance Sheets - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 43,641,861	$ 13,968,742
Prepaid and other current assets	594,345	1,246,360
Total current assets	44,236,206	15,215,102
Equipment, net	34,554	51,832
Other assets	168,969	112,345
Total assets	44,439,729	15,379,279
Current liabilities:
Accounts payable	9,447,359	3,687,245
Accrued expenses and other current liabilities	8,413,107	3,843,299
Loan payable, current portion	648,523	3,291,394
Total current liabilities	18,508,989	10,821,938
Loan payable, long-term	19,108,144	3,619,420
Total liabilities	37,617,133	14,441,358
Stockholders' equity:
Preferred stock, $0.0001 par value per share (10,000,000 shares authorized, none issued and outstanding at September 30, 2019 and December 31, 2018, respectively)
Common stock, $0.0001 par value per share (150,000,000 shares authorized, 34,496,846 and 30,087,213 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively)	3,450	3,009
Additional paid-in capital	157,907,655	108,485,219
Accumulated deficit	(151,088,509)	(107,550,307)
Total stockholders' equity	6,822,596	937,921
Total liabilities and stockholders' equity	$ 44,439,729	$ 15,379,279