Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Licensing revenue	$ 250,000	$ 100,000
Expenses:
Research and development	388,841	15,847,722
General and administrative	8,079,861	12,502,042
Depreciation and amortization	29,423	106,989
Total expenses	8,498,125	28,456,753
Loss before other income (expense)	(8,248,125)	(28,356,753)
Other income (expense):
Interest income	355,558	365,584
Interest expense	(1,715,733)	(3,831,211)
Other income (expense), net	2,676	6,998
Gain on warrant liabilities	527,025	1,367,777
Loss before provision for income taxes	(9,078,599)	(30,447,605)
Provision for income taxes	(800)	(800)
Loss from continuing operations	(9,079,399)	(30,448,405)
Discontinued operations (Note 3)	(3,634,209)	(4,538,027)
Net loss	$ (12,713,608)	$ (34,986,432)
Basic and diluted loss per share
Continuing operations	$ (0.29)	$ (1.27)
Discontinued operations	(0.12)	(0.19)
Total basic and diluted loss per share	$ (0.41)	$ (1.46)
Basic and diluted weighted average shares outstanding	30,947,650	24,042,293