Balance Sheets - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash and cash equivalents	$ 5,160,070	$ 7,585,392
Prepaid expenses and other	593,404	413,280
Total current assets	5,753,474	7,998,672
Fixed assets, net (Note 3)	5,677,632	5,997,582
Deposits	33,856	33,856
Right-of-use asset (Note 5)	1,127,825	0
Total assets	12,592,787	14,030,110
Current liabilities
Accounts payable and accrued expenses	1,278,523	1,324,651
Accrued compensation	41,486	0
Lease liability - current portion (Note 5)	241,144	59,579
Total current liabilities	1,561,153	1,384,230
Long-term lease liability (Note 5)	1,407,054	476,753
Warrant derivative liability	10,092,563	6,933,031
Total liabilities	13,060,770	8,794,014
Commitments and contingencies (Note 5)
Stockholders' equity
Preferred Stock, par value $0.0001; 10,000,000 shares authorized; none issued
Common Stock, par value $0.0001; 200,000,000 shares authorized; shares issued and outstanding - 111,127,878 in March 31, 2019 (unaudited) and 110,941,516 in December 31, 2018	11,113	11,094
Additional paid-in capital	176,335,046	176,227,510
Accumulated deficit	(176,814,142)	(171,002,508)
Total stockholders’ (deficit) equity	(467,983)	5,236,096
Total liabilities and stockholders' equity	$ 12,592,787	$ 14,030,110