Preferred Stock - Series B and B-1 Convertible Preferred Stock (Details)						1 Months Ended								12 Months Ended
	Mar. 23, 2020 USD ($) $ / shares	Mar. 05, 2020 USD ($) $ / shares	Oct. 09, 2019 USD ($)	Oct. 03, 2019 USD ($) shares	Jul. 23, 2019 USD ($)	Dec. 31, 2020 USD ($) $ / shares shares	Oct. 31, 2020 shares	Mar. 31, 2020 USD ($) $ / shares	Feb. 29, 2020 USD ($) $ / shares	Jan. 31, 2020 $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Oct. 31, 2019 USD ($) $ / shares shares	Jul. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Mar. 22, 2020 $ / shares	Mar. 04, 2020 $ / shares	Sep. 30, 2019 $ / shares	Aug. 31, 2019 $ / shares	Aug. 28, 2018 shares
Issuance costs | $															$ 65,000
Preferred stock, shares outstanding						857,055					5,537,062			857,055	5,537,062
Warrants and Rights Outstanding | $						$ 179,000					$ 3,000			$ 179,000	$ 3,000
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 | $ / shares													$ 1,000
Number of shares issued for each convertible preferred stock													500
Gross proceeds | $													$ 4,200,000
Issuance costs | $															875,000
Beneficial Conversion Feature | $					$ 4,200,000
Deemed dividend | $					$ 4,200,000										$ 4,240,000
Shares converted										2,631				1,971	8,816
Shares issued on conversion										499,890
Preferred stock, shares outstanding						0					1,971			0	1,971
Number of securities issued on conversion											985,500				985,500
Number of voting rights														no
Series B-1 convertible preferred stock
Beneficial Conversion Feature | $			$ 385,000	$ 145,000
Deemed dividend | $			$ 385,000	$ 145,000											$ 530,000
Shares converted														10,001
Value of shares issued on conversion | $														$ 12,201
Conversion Price (in dollars per share) | $ / shares						$ 1.22								$ 1.22
Conversion ratio														10,001
Preferred stock, shares outstanding											0				0
Exercise price (in dollars per share) | $ / shares												$ 1.40
Proceeds from Issuance of Warrants | $												$ 1,750,001
Number of securities issued on conversion				63							63	1			63
Aggregate proceeds | $												$ 1,800,000
Shares issued (in shares)												63
Deemed dividend understatement amount | $														$ 0
Series B-2 convertible preferred stock
Shares converted						6,559	975								190
Value of shares issued on conversion | $															$ 153.90
Conversion Price (in dollars per share) | $ / shares											$ 0.81				$ 0.81
Conversion ratio															190
Shares issued on conversion						1,246,210	500,186
Preferred stock, shares outstanding						0					10,165			0	10,165
Deemed dividend understatement amount | $														$ 0
Number of voting rights														no
Common Stock | Series B convertible preferred stock
Shares issued on conversion															4,408,000
Common Stock | Series B-1 convertible preferred stock
Shares issued on conversion											630,063
Series 1 warrants
Number of warrants converted for each share												19,841
Gross proceeds | $													$ 3,300,000
Deemed dividend | $															$ 522,000
Exercise price (in dollars per share) | $ / shares									$ 0.6920	$ 2.00			$ 2.00					$ 1.40	$ 2.00
Proceeds from Issuance of Warrants | $									$ 144,000
Warrant exercise agreement												1,250,000
Preferred stock, par value (in dollars per share) | $ / shares												$ 12,201
Warrants exercised												1,250,000
Series 1 warrants | Series B-1 convertible preferred stock
Warrant Exercise During Period, Shares												1,250,000
Series 2 warrants
Gross proceeds | $													$ 3,300,000
Issuance costs | $	$ 25,000
Exercise price (in dollars per share) | $ / shares	$ 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
Gross proceeds | $													$ 10,800,000
Issuance costs | $													$ 1,600,000		$ 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
Number of warrants converted for each share													500
Common stock issued and issuable													5,393,500
Underwritten Public Offering | Class A units
Units issued													2,886,500
Public offering price | $ / shares													$ 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
Number of warrants converted for each share													1
Underwritten Public Offering | Class A units | Series 2 warrants
Number of shares in exchange for each unit													1
Underwritten Public Offering | Class B units
Units issued													10,787
Public offering price | $ / shares													$ 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
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) | $ / shares								$ 0.5227
Minimum | Exercise Agreement | Series 2 warrants | Series B convertible preferred stock
Exercise price (in dollars per share) | $ / shares								0.4456
Maximum | Exercise Agreement | Series 2 warrants
Exercise price (in dollars per share) | $ / shares								2.00
Maximum | Exercise Agreement | Series 2 warrants | Series B convertible preferred stock
Exercise price (in dollars per share) | $ / shares								$ 2.00