Warrants - PIPE Financing Warrants (Details)		1 Months Ended		12 Months Ended
	Mar. 05, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Jul. 31, 2019 USD ($) Y $ / shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / shares security shares	Mar. 23, 2020 $ / shares	Mar. 22, 2020 $ / shares	Mar. 04, 2020 $ / shares	Aug. 28, 2018 shares
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrants to purchase (in shares) | shares									9,580
Aggregate purchase price of warrants		$ 3,000		$ 179,000	$ 3,000
PIPE Financing Warrants, Dec 2019
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Exercise price (in dollars per share) | $ / shares		$ 0.78			$ 0.78
Warrant exercisable period after, issuance date		6 months
Term of warrant		5 years			5 years
Proceeds from issuance of warrants					$ 1,500,000
Number of securities | security					2
Issuance of common stock				$ 668,000	$ 1,035,000
Issuance of warrants		$ 686,000			$ 465,000
PIPE Financing Warrants, Dec 2019 | Maximum
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrants to purchase (in shares) | shares		1,250,000			1,250,000
Aggregate purchase price of warrants		$ 1,500,000			$ 1,500,000
Series 2 warrants
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Exercise price (in dollars per share) | $ / shares	$ 0.6050		$ 2.00			$ 0.5227	$ 2.00	$ 2.00
Term of warrant			5 years
Proceeds from issuance of warrants	$ 55,000
Issuance of warrants			$ 5,000,000		$ 5,026,000
Private placement | PIPE Financing Warrants, Dec 2019
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Unregistered shares issued | shares		2,500,000
Stock price | PIPE Financing Warrants, Dec 2019
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant liability | $ / shares		0.62			0.62
Stock price | Series 2 warrants
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant liability | $ / shares			1.73
Strike price | PIPE Financing Warrants, Dec 2019
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant liability | $ / shares		0.78			0.78
Strike price | Series 2 warrants
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant liability | $ / shares			2.00
Expected life | PIPE Financing Warrants, Dec 2019
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Term of warrant		5 years			5 years
Expected life | Series 2 warrants
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant exercisable period after, issuance date			5 years
Warrant liability | Y			5.0
Volatility | PIPE Financing Warrants, Dec 2019
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant liability		143			143
Volatility | Series 2 warrants
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant liability			109.25
Risk free rate | PIPE Financing Warrants, Dec 2019
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant liability		2.42			2.42
Risk free rate | Series 2 warrants
Convertible Promissory Notes and Common Stock Warrants [Line Items]
Warrant liability			1.83