Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands					1 Months Ended		12 Months Ended
	Nov. 21, 2019	Mar. 12, 2019	Jan. 18, 2019	Jan. 14, 2019	Sep. 20, 2018	Jun. 30, 2015	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shareholders Equity [Line Items]
Stockholders' Equity Attributable to Parent							$ 21,086	$ 1,218	$ 8,067
Common Stock, shares issued							3,692,000	680,000
Common Stock, Shares, Outstanding							3,692,000	680,000
Preferred Stock, Shares Issued							0	0
Preferred Stock, Shares Outstanding							0	0
Stock Issued During Period, Value, New Issues			$ 1,700				$ 26,700	$ 1,180
Stockholders' Equity Attributable to Parent							21,086	1,218	8,067
Proceeds from Issuance of Common Stock		$ 17,000	$ 1,500	$ 900			$ 26,700	$ 1,180
Preferred Stock, shares outstanding							0	0
Stock Issued During Period Shares Warrants Exercised							409,875
Weighted Average Excercise Price							$ 2.67
Proceeds from Stock Options Exercised							$ 1,083	$ 0
Warrant [Member]
Shareholders Equity [Line Items]
Stock Issued During Period, Value, New Issues						$ 25,000
Proceeds from Issuance of Common Stock	$ 7,300				$ 1,200
Warrants issued		42,775
Common Stock
Shareholders Equity [Line Items]
Stockholders' Equity Attributable to Parent							$ 4	$ 1	1
Stock Issued During Period, Shares, New Issues							2,602,000	113,000
Stock Issued During Period, Value, New Issues							$ 3
Stockholders' Equity Attributable to Parent							$ 4	$ 1	$ 1
IPO [Member]
Shareholders Equity [Line Items]
Stock Issued During Period, Shares, New Issues				429,616
Proceeds from Issuance of Common Stock				$ 1,100
Shares Issued, Price Per Share				$ 2.60
2018 Registered Direct Offering [Member]
Shareholders Equity [Line Items]
Stock Issued During Period, Shares, New Issues					98,454
Stock Issued During Period, Value, New Issues					$ 1,500
2018 Registered Direct Offering [Member] | Warrant [Member]
Shareholders Equity [Line Items]
Warrants issued					14,624
2019 Registered Direct Offering [Member]
Shareholders Equity [Line Items]
Stock Issued During Period, Shares, New Issues	808,080	712,910	648,233
Class of Warrant or Right, Number of Securities Called by Warrants or Rights			324,117
Stock Issued During Period, Value, New Issues	$ 8,000	$ 18,500
2019 Registered Direct Offering [Member] | Warrant [Member]
Shareholders Equity [Line Items]
Warrants issued	606,060
Private Placement [Member]
Shareholders Equity [Line Items]
Warrants issued				25,777
Private Placement [Member] | Series A Warrants [Member]
Shareholders Equity [Line Items]
Warrants issued					113,077
HC Wainwright Co [Member]
Shareholders Equity [Line Items]
Shares Issued, Price Per Share				$ 2.418
HC Wainwright Co [Member] | 2018 Registered Direct Offering [Member]
Shareholders Equity [Line Items]
Warrants issued					6,785
HC Wainwright Co [Member] | 2019 Registered Direct Offering [Member]
Shareholders Equity [Line Items]
Warrants issued	48,485
HC Wainwright Co [Member] | Private Placement [Member] | Common Stock
Shareholders Equity [Line Items]
Warrants issued			38,894