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Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Grant and collaboration revenue	$ 963,203	$ 1,075,270	$ 828,918
Operating expenses:
Research and development	1,878,652	2,017,350	1,970,859
General and administrative	1,647,268	1,232,368	2,131,426
Total operating expenses	3,525,920	3,249,718	4,102,285
Loss from operations	(2,562,717)	(2,174,448)	(3,273,367)
Other income (expense):
Interest income	5,213	4,286	1,666
Interest expense	(2,590)
Total other income (expense)	2,623	4,286	1,666
Net loss	$ (2,560,094)	$ (2,170,162)	$ (3,271,701)
Basic and diluted:
Loss per common share (in dollars per share)	$ (0.02)	$ (0.03)	$ (0.08)
Weighted average shares outstanding (in shares)	163,584,755	68,605,817	41,516,514

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