Common Stock Warrants and Common Stock Warrant Liability (Details) - $ / shares		9 Months Ended	12 Months Ended
		Sep. 30, 2018	Dec. 31, 2017
Outstanding at beginning		6,431,785	829,285
Warrants issued
Warrants exercised		(1,475,659)
Outstanding at end		11,714,940	6,431,785
Warrants issued [Member]
Warrants issued		1,133,909
Date Issued		2018-06
Term		5 years
Exercise Price (in dollars per share)		$ 1.82
Common Stock Offering Warrants Issued [Member]
Warrants issued		5,357,052	4,657,500
Date Issued		2018-08	2017-11
Term		5 years	5 years
Exercise Price (in dollars per share)	[1]	$ 1.15	$ 1.50
Common Stock Offering - Dealer Manager Warrants [Member]
Warrants issued		267,853
Date Issued		2018-08
Term		5 years
Exercise Price (in dollars per share)		$ 1.725
Common Stock Offering Underwriter Warrants [Member]
Warrants issued			945,000
Date Issued			2017-11
Term			5 years
Exercise Price (in dollars per share)			$ 1.50

[1] The common stock warrants issued in November 2017 with an initial exercise price of $1.50 per share adjusted downward to $0.95 per share effective July 24, 2018 in connection with our Rights Offering, and may be subject to further downward adjustments, pursuant to antidilution price adjustment protection contained within those warrants.