Stockholders' Equity - Transactions with Oasis Capital and Underwritten Public Offering (Details)				1 Months Ended						9 Months Ended		12 Months Ended
	Mar. 23, 2020 USD ($)	Mar. 05, 2020 USD ($)	Jan. 07, 2019 $ / shares shares	Apr. 30, 2020 USD ($) shares	Mar. 31, 2020 USD ($) D $ / shares shares	Feb. 29, 2020 USD ($)	Dec. 31, 2019 USD ($) shares	Jul. 31, 2019 USD ($)	Mar. 31, 2019 USD ($) $ / shares shares	Sep. 30, 2020 USD ($) shares	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Nov. 06, 2020 shares	Jun. 30, 2020 USD ($)	Apr. 15, 2020 USD ($)	Mar. 24, 2020 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)
Amount of shares issued										$ 668,000
Common stock, shares issued | shares													20,578,097
Stockholders’ equity							$ 10,673,000			7,806,000	$ 11,380,000	$ 10,673,000		$ 1,544,000			$ (1,646,000)	$ 5,383,000
Gross proceeds from issuance of warrants	$ 653,000
Series B convertible preferred stock
Stockholders’ equity							$ 476,000				410,000	476,000
Series 1 warrants
Gross proceeds from issuance of warrants						$ 144,000
Series 2 warrants
Gross proceeds from issuance of warrants		$ 55,000
Net proceeds from issuance of warrants	628,000
Issuance costs	$ 25,000
PIPE Financing Warrants, Dec 2019
Amount of shares issued												1,035,000
Gross proceeds from issuance of warrants												$ 1,500,000
PIPE Financing Warrants, Dec 2019 | Private placement
Issuance of common stock (In shares) | shares							2,500,000
PIPE Financing Warrants, March 2020
Gross proceeds from issuance of warrants					$ 720,000
Net proceeds from issuance of warrants					668,578
Issuance costs					$ 51,422
PIPE Financing Warrants, March 2020 | Private placement
Issuance of common stock (In shares) | shares					1,714,283
Class A units
Issuance costs											875,000
Class B units
Issuance costs								$ 1,635,000			$ 1,635,000
Securities purchase agreement
Price per share | $ / shares			$ 52.50
Common stock, shares issued | shares									190,476
Securities purchase agreement | Registered Direct Offering
Price per share | $ / shares									$ 14.00
Gross proceeds from issuance									$ 266,000	$ 266,000
Issuance of common stock (In shares) | shares									19,019	19,019
Securities purchase agreement | Original Equity Line Offering
Common Stock, Shares Authorized | shares			76,190
Number of shares offered | shares			76,190
Number of additional shares authorized | shares			114,286
Common stock, shares issued | shares									76,190
Securities purchase agreement | Option
Common stock, shares issued | shares									114,286
Equity Line of Credit
Gross proceeds from issuance				$ 22,627
Issuance of common stock (In shares) | shares				52,000
Amount of shares issued					$ 200,000
Term of equity purchase agreement					36 months
Shares issued in settlement of commitment fee | shares				68,807
Fair value of equity issued				$ 33,027
Equity Line of Credit | Maximum
Aggregate amount of put option on any put date or clearing date					$ 500,000
Aggregate amount of equity purchase agreement					$ 2,000,000
Option 1 Put | Equity Line of Credit
Issuance of common stock (In shares) | shares					200,000
Percentage of average trading volume					20.00%
Trading days | D					10
Share Price | $ / shares					$ 0.436
Option 2 Puts | Equity Line of Credit
Percentage of average trading volume					10.00%
Share Price | $ / shares					$ 0.436
Option 1 and Option 2 Puts | Equity Line of Credit
Derivative Asset, Noncurrent																$ 0
Stockholders’ equity															$ 0