Organization and Description of Business (Details Narrative) - USD ($) $ / shares in Units, $ in Thousands			9 Months Ended	12 Months Ended
	Aug. 31, 2018	Aug. 13, 2018	Sep. 30, 2018	Dec. 31, 2017	Jun. 01, 2018	Nov. 30, 2017	Nov. 21, 2017	Dec. 08, 2016
Proceeds from the exercise of warrants			$ 2,213
Proceeds from issuance and sale of common stock, preferred stock, warrants exercise, convertible and other promissory notes			61,700
Proceeds from licensing fees			1,700
Proceeds from product sales			200
Accumulated deficit			(83,208)	$ (73,597)
Cash, cash equivalents and short-term investments			$ 7,200
Common Stock Offering Warrants Issued
Initial Public Offering [Member]
Number of shares issued								1,875,000
Initial Public Offering [Member] | Common Stock Purchase Warrants [Member]
Number of shares issued								187,500
exercise price (in dollars per share)								$ 9.60
Public Offering [Member]
Number of shares issued							5,860,000
Shares issued per share (in dollars per share)							$ 1.00
Public Offering [Member] | Common Stock Purchase Warrants [Member] | Investor [Member]
Number of shares issued							4,657,500
exercise price (in dollars per share)							$ 1.50
Public Offering [Member] | Common Stock Purchase Warrants [Member] | Roth Capital Partners, LLC [Member]
Number of shares issued							945,000
exercise price (in dollars per share)							$ 1.50
Private placement [Member] | Common Stock Purchase Warrants [Member]
Number of shares issued					1,133,909	1,133,909
exercise price (in dollars per share)					$ 1.82	$ 1.50
Right Offering [Member]
exercise price (in dollars per share)	$ 1.15	$ 1.15
Unit price (in dollars per unit)	1.15	$ 1.15
Number of subscriptions shares accept		5,357,052
Common Stock Offering Warrants Issued		5,357,052
Right Offering [Member] | Common Stock Purchase Warrants [Member] | Maxim Partners LLC [Member]
exercise price (in dollars per share)	$ 1.725	$ 1.725
Number of subscriptions shares accept	5,357,052
Common Stock Offering Warrants Issued	267,853	267,853