Convertible Preferred Stock - Series B-1 Convertible Preferred Stock (Details) - USD ($)						1 Months Ended						2 Months Ended	3 Months Ended	6 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	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Mar. 22, 2020	Mar. 04, 2020	Sep. 30, 2019
Issuance costs														$ 51,000	$ 3,000
Proceeds from Issuance of Warrants	$ 653,000
Number of securities issued on conversion													9,580	9,580
Series B convertible preferred stock inducement expense														$ 1,647,000
Issued									5,537,062				5,532,460	5,532,460
Convertible preferred stock, shares outstanding									5,537,062				5,534,431	5,534,431
Warrants and Rights Outstanding									$ 3,000				$ 4,086,000	$ 4,086,000
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
Number of securities issued on conversion									985,500
Shares converted								2,631				8,816	1,971
Beneficial Conversion Feature					$ 4,240,000
Deemed dividend					$ 4,240,000
Issuance of common stock upon conversion (in shares)								499,890
Issued									1,971				0	0
Convertible preferred stock, shares outstanding									1,971				0	0
Series B-1 convertible preferred stock
Exercise price (in dollars per share)										$ 1.40
Aggregate proceeds										$ 1,750,000
Shares issued (in shares)										63
Proceeds from Issuance of Warrants			$ 1,750,000
Number of securities issued on conversion			63	63						1
Beneficial Conversion Feature			$ 385,000	$ 146,000
Deemed dividend			$ 385,000	$ 146,000
Issued									0				0	0
Convertible preferred stock, shares outstanding									0				0	0
Common Stock
Issuance of common stock upon conversion (in shares)									630,063			4,408,000
Series 1 warrants
Gross proceeds											$ 3,274,000
Warrant exercise agreement										1,250,000
Preferred stock, par value (in dollars per share)										$ 12,000
Number of warrants are converted for each share										19,841
Exercise price (in dollars per share)											$ 2.00							$ 1.40
Warrants exercised			1,250,000	1,250,000
Proceeds from Issuance of Warrants							$ 144,000
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 | 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
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 are 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 shares issued for each convertible preferred stock											500
Number of warrants are converted for each share					500
Underwritten Public Offering | Class B units | Series 1 warrants
Number of shares in exchange for each unit											500
Underwritten Public Offering | Class B units | Series 1 warrants | Series B convertible preferred stock
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
Proceeds from Issuance of Warrants						$ 653,000
Warrants and Rights Outstanding						$ 1,250,000
Minimum | Series 1 warrants
Exercise price (in dollars per share)							$ 2.00
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 | Series 1 warrants
Exercise price (in dollars per share)							$ 0.692
Maximum | Exercise Agreement | Series 2 warrants
Exercise price (in dollars per share)													$ 2.00	$ 2.00
Maximum | Exercise Agreement | Series 2 warrants | Series B convertible preferred stock
Exercise price (in dollars per share)						$ 2.00