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Warrants (Details) $ / shares in Units, $ in Thousands						12 Months Ended
	Jun. 22, 2020 $ / shares shares	Mar. 05, 2020 $ / shares shares	Jan. 03, 2020 Vote item $ / shares shares	Feb. 05, 2019 $ / shares shares	Jan. 01, 2019 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares
Warrants
Number of Shares Issuable						52,704,735
Warrant, equity component | $					$ 3,448		$ 3,448
Dividend attributable to down round feature of warrants | $						$ 303	$ 359
Common stock issued				7,557,142
Common Stock
Warrants
Common stock issued							7,557,142
Series A Convertible Preferred Stock
Warrants
Common stock issued						1,421,801
Series B Convertible Preferred Stock
Warrants
Common stock issued						1,137,442
2017 Warrants
Warrants
Exercise price of warrant | $ / shares					$ 6.085	$ 1.055	$ 1.75
Warrant, equity component | $					$ 3,448
Dividend attributable to down round feature of warrants | $						$ 303	$ 359
Number of warrants or rights exercised						208,254
Class of Warrant or Right, Exercised | $						$ 220
2019 Warrants
Warrants
Exercise price of warrant | $ / shares				$ 1.95
Warrant to purchase shares of common stock				7,557,142
Number of warrants or rights exercised						65,700
Class of Warrant or Right, Exercised | $						$ 128
January 2020 Warrants | Series A Convertible Preferred Stock
Warrants
Exercise price of warrant | $ / shares		$ 0.001
Warrant to purchase shares of common stock		14,413,902
Common stock issued			1,421,801
Purchase price | $ / shares			$ 10.54
Number of special voting stock | Vote			1
Number of members to elect of board of directors | item			1
January 2020 Warrants | Series B Convertible Preferred Stock
Warrants
Exercise price of warrant | $ / shares		$ 2.11
Common stock issued			1,137,442
Purchase price | $ / shares			$ 10.55
Conversion of Stock, Shares Issued		11,531,133
June 2020 Warrants
Warrants
Exercise price of warrant | $ / shares	$ 0.001
Warrant to purchase shares of common stock	2,250,000
June 2020 Warrants | Common Stock
Warrants
Common stock issued	20,250,000
Purchase price | $ / shares	$ 2.00
1/23/2017
Warrants
Number of Shares Issuable						54,516
Exercise price of warrant | $ / shares						$ 0.01
11/14/2017
Warrants
Number of Shares Issuable						2,549,840
Exercise price of warrant | $ / shares						$ 1.055
2/5/2019
Warrants
Number of Shares Issuable						7,491,442
Exercise price of warrant | $ / shares						$ 1.95
3/5/2020
Warrants
Number of Shares Issuable						14,413,902
Exercise price of warrant | $ / shares						$ 0.001
3/5/2020
Warrants
Number of Shares Issuable						25,945,035
Exercise price of warrant | $ / shares						$ 2.11
6/22/2020
Warrants
Number of Shares Issuable						2,250,000
Exercise price of warrant | $ / shares						$ 0.001

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