Balance Sheets - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 5,319,004	$ 7,679,267
Prepaid expenses	329,218	251,046
Total current assets	5,648,222	7,930,313
Other assets	11,551	11,551
Total assets	5,659,773	7,941,864
Current Liabilities:
Accounts payable and accrued expenses	476,202	1,048,927
Accrued compensation	1,158,251	1,025,911
Total current liabilities	1,634,453	2,074,838
Warrant liability		3,701,277
Total liabilities	1,634,453	5,776,115
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.0001 par value; authorized shares — 5,000,000 at December 31, 2018 and 2017; issued and outstanding shares — 0 at December 31, 2018 and 2017
Common stock, $0.0001 par value; authorized shares — 50,000,000 at December 31, 2018 and 2017; issued and outstanding shares — 17,427,533 and 15,413,610 at December 31, 2018 and 2017, respectively	1,743	1,541
Additional paid-in capital	82,628,312	73,202,863
Accumulated deficit	(78,604,735)	(71,038,655)
Total stockholders' equity	4,025,320	2,165,749
Total liabilities and stockholders' equity	$ 5,659,773	$ 7,941,864