Organization and Description of Business (Details Narrative) $ / shares in Units, $ in Thousands				1 Months Ended		12 Months Ended
	Feb. 06, 2020	Feb. 04, 2020	Aug. 13, 2018 $ / shares shares	Jul. 16, 2019 USD ($) $ / shares shares	Nov. 21, 2017 $ / shares shares	Dec. 31, 2019 USD ($) Number shares	Dec. 31, 2018 USD ($) shares	Jan. 28, 2020 $ / shares	Aug. 31, 2018 $ / shares shares	Jun. 30, 2018 $ / shares shares	Nov. 30, 2017 $ / shares shares	Dec. 08, 2016 $ / shares shares
Organization and Description of Business (Textual)
Proceeds from issuance and sale of common stock, preferred stock, warrants exercise, convertible and other promissory notes | $						$ 67,200
Proceeds from licensing fees | $						1,700
Proceeds from product sales | $				$ 3,600		600
Accumulated deficit | $						(95,867)	$ (85,838)
Cash, cash equivalents and short-term investments | $						$ 1,900
Common Stock Offering Warrants Issued | shares
Issuance of common stock upon exercise of warrants | $						$ 1,788	$ 2,214
Sales Revenue, Net [Member]
Organization and Description of Business (Textual)
Number of customers | Number						2
Sales Revenue, Net [Member] | Customer one [Member]
Organization and Description of Business (Textual)
Percentage						12.00%
Customer Revenues | $						$ 17
Sales Revenue, Net [Member] | Customer Two [Member]
Organization and Description of Business (Textual)
Percentage						20.00%
Customer Revenues | $						$ 28
Accounts Receivable [Member] | Customer one [Member]
Organization and Description of Business (Textual)
Percentage						83.00%
Customer Revenues | $						$ 123
Public Offering [Member]
Organization and Description of Business (Textual)
Number of shares issued | shares				151,838	293,000							93,750
Unit price (in dollars per unit)					$ 20.00
Adjusted downward common stock					$ 19.00
Public Offering [Member] | Chief Executive Officer [Member]
Organization and Description of Business (Textual)
Number of shares issued | shares				34,815
Public Offering [Member] | Employee [Member]
Organization and Description of Business (Textual)
Number of shares issued | shares				371
Unit price (in dollars per unit)				$ 27.00
Public Offering [Member] | Warrant [Member]
Organization and Description of Business (Textual)
Number of shares issued | shares				8,334	232,875							9,375
Exercise price (in dollars per share)				$ 33.75	$ 30.00							$ 192.00
Public Offering [Member] | Warrant [Member] | Roth Capital Partners [Member]
Organization and Description of Business (Textual)
Number of shares issued | shares					47,250
Exercise price (in dollars per share)					$ 30.00
Private Placement [Member] | Warrant [Member]
Organization and Description of Business (Textual)
Number of shares issued | shares										56,696	56,696
Exercise price (in dollars per share)										$ 36.40	$ 30.00
Rights Offering [Member]
Organization and Description of Business (Textual)
Exercise price (in dollars per share)			$ 23.00						$ 23.00
Unit price (in dollars per unit)									$ 23.00
Number of subscriptions shares accept | shares									267,853
Common Stock Offering Warrants Issued | shares			267,853
Rights Offering [Member] | Warrant [Member]
Organization and Description of Business (Textual)
Number of shares issued | shares									13,393
Exercise price (in dollars per share)									$ 34.50
Subsequent Event [Member]
Organization and Description of Business (Textual)
Unit price (in dollars per unit)								$ 8.00
Reverse split, description	The Company issued 24 shares of Common stock to shareholders of record in connection with fractional shares as a result of a 1-for-20 reverse stock split of our outstanding common stock on February 4, 2020.	1-for-20 reverse split
Subsequent Event [Member] | Warrant [Member]
Organization and Description of Business (Textual)
Exercise price (in dollars per share)								$ 9.00