Preferred Stock - Series B and B-1 Convertible Preferred Stock (Details) - USD ($)						1 Months Ended						2 Months Ended	9 Months Ended
	Mar. 23, 2020	Mar. 05, 2020	Oct. 09, 2019	Oct. 03, 2019	Jul. 23, 2019	Mar. 31, 2020	Feb. 29, 2020	Jan. 31, 2020	Dec. 31, 2019	Oct. 31, 2019	Jul. 31, 2019	Aug. 31, 2019	Sep. 30, 2020	Sep. 30, 2019	Mar. 22, 2020	Mar. 04, 2020	Aug. 28, 2018
Warrants and Rights Outstanding									$ 3,000				$ 126,000
Proceeds from Issuance of Warrants	$ 653,000
Series B convertible preferred stock inducement expense													$ 1,647,000
Number of securities issued on conversion																	9,580
Series B convertible preferred stock
Stated or par value											$ 1,000
Number of shares issued for each convertible preferred stock											500
Gross proceeds											$ 4,240,000
Beneficial Conversion Feature					$ 4,240,000
Deemed dividend					$ 4,240,000									$ 3,876,000
Shares converted								2,631				8,816
Shares issued on conversion								499,890
Convertible preferred stock, shares outstanding									1,971				0	1,971
Number of securities issued on conversion									985,500
Series B-1 convertible preferred stock
Beneficial Conversion Feature			$ 385,000	$ 146,000
Deemed dividend			385,000	$ 146,000
Convertible preferred stock, shares outstanding									0				0
Exercise price (in dollars per share)										$ 1.40
Proceeds from Issuance of Warrants			$ 1,750,000
Number of securities issued on conversion			63	63						1
Aggregate proceeds										$ 1,750,000
Shares issued (in shares)										63
Common Stock
Shares issued on conversion									630,063			4,408,000
Series 1 warrants
Number of warrants converted for each share										19,841
Gross proceeds											$ 3,274,000
Deemed dividend														$ 252,000
Exercise price (in dollars per share)							$ 0.6920	$ 2.00			$ 2.00	$ 2.00		$ 1.40
Proceeds from Issuance of Warrants							$ 144,000
Warrant exercise agreement										1,250,000
Preferred stock, par value (in dollars per share)										$ 12,000
Warrants exercised			1,250,000	1,250,000
Series 1 warrants | Series B-1 convertible preferred stock
Warrant Exercise During Period, Shares			1,250,000	1,250,000
Series 2 warrants
Gross proceeds											$ 3,274,000
Issuance costs	$ 25,000
Exercise price (in dollars per share)	$ 0.5227	$ 0.6050									$ 2.00				$ 2.00	$ 2.00
Proceeds from Issuance of Warrants		$ 55,000
Class A units
Issuance costs														$ 875,000
Class A units | Series 1 warrants
Common stock issued and issuable											2,886,500
Class A units | Series 2 warrants
Units issued											2,886,500
Common stock issued and issuable											2,886,500
Class B units
Units issued											10,787
Public offering price											$ 1,000
Gross proceeds											$ 10,787,000
Issuance costs											$ 1,635,000			$ 1,635,000
Class B units | Series B convertible preferred stock
Units issued											10,787
Class B units | Series 1 warrants
Units issued											10,787
Common stock issued and issuable											5,393,500
Class B units | Series 2 warrants
Units issued											10,787
Common stock issued and issuable											5,393,500
Underwritten Public Offering | Series 2 warrants
Number of shares in exchange for each unit											1
Underwritten Public Offering | Class A units
Units issued											2,886,500
Public offering price											$ 2.00
Number of shares in exchange for each unit											1
Number of warrants converted for each share											1
Underwritten Public Offering | Class A units | Series 1 warrants
Number of shares in exchange for each unit											1
Underwritten Public Offering | Class B units
Units issued											10,787
Public offering price											$ 1,000
Underwritten Public Offering | Class B units | Series B convertible preferred stock
Number of shares in exchange for each unit											1
Number of warrants converted for each share					500
Number of shares issued for each convertible preferred stock											500
Underwritten Public Offering | Class B units | Series 1 warrants
Number of shares in exchange for each unit											500
Number of shares issued for each convertible preferred stock											500
Underwritten Public Offering | Class B units | Series 2 warrants
Number of shares in exchange for each unit											500
Number of shares issued for each convertible preferred stock											500
Exercise Agreement | Series 2 warrants
Warrants and Rights Outstanding						$ 1,250,000
Proceeds from Issuance of Warrants						$ 653,000
Minimum | Exercise Agreement | Series 2 warrants
Exercise price (in dollars per share)						$ 0.5227
Minimum | Exercise Agreement | Series 2 warrants | Series B convertible preferred stock
Exercise price (in dollars per share)						0.4456
Maximum | Exercise Agreement | Series 2 warrants
Exercise price (in dollars per share)													$ 2.00
Maximum | Exercise Agreement | Series 2 warrants | Series B convertible preferred stock
Exercise price (in dollars per share)						$ 2.00