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Warrants (Details) $ / shares in Units, $ in Thousands					12 Months Ended
	Sep. 24, 2021 $ / shares shares	Jun. 22, 2020 $ / shares shares	Mar. 05, 2020 $ / shares shares	Jan. 03, 2020 Vote item $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Feb. 05, 2019 $ / shares shares
Warrants
Number of Shares Issuable					60,386,157
Warrant, Down Round Feature, (Increase) Decrease in Equity, Amount | $						$ 303
January 23 2017 Warrants
Warrants
Number of Shares Issuable					54,516
Exercise price of warrant | $ / shares					$ 0.01
2017 Warrants
Warrants
Number of Shares Issuable					2,502,382
Exercise price of warrant | $ / shares					$ 1.055	$ 1.75
Warrant, Down Round Feature, (Increase) Decrease in Equity, Amount | $						$ 303
Gross proceeds | $					$ 50	$ 220
Number of warrants or rights exercised					47,458	208,254
2019 Warrants
Warrants
Number of Shares Issuable					7,008,257
Exercise price of warrant | $ / shares					$ 1.95		$ 1.95
Gross proceeds | $					$ 943	$ 128
Number of warrants or rights exercised					483,185	65,700
Warrant to purchase shares of common stock							7,557,142
March 2020
Warrants
Number of Shares Issuable					14,413,902
Exercise price of warrant | $ / shares					$ 0.001
March 2020.
Warrants
Number of Shares Issuable					25,945,035
Exercise price of warrant | $ / shares					$ 2.11
June 2020
Warrants
Number of Shares Issuable					1,690,137
Exercise price of warrant | $ / shares		$ 0.001			$ 0.001
Number of warrants or rights exercised					559,863
Warrant to purchase shares of common stock		2,250,000
June 2020 | Common Stock.
Warrants
Number of Shares Issuable					559,705
June 2020 | Common Stock.
Warrants
Common stock issued		20,250,000
Purchase price | $ / shares		$ 2.00
September 2021
Warrants
Number of Shares Issuable					8,771,928
Exercise price of warrant | $ / shares	$ 0.001				$ 0.001
Common stock issued	8,771,928
Purchase price | $ / shares	$ 2.85
Warrant to purchase shares of common stock	8,771,928
September 2021 | Common Stock.
Warrants
Common stock issued	22,828,072
Purchase price | $ / shares	$ 2.85
September 2021 | Common Stock.
Warrants
Common stock issued	27,568,072
Purchase price | $ / shares	$ 0.001
March 2020 Warrants | Series A Convertible Preferred Stock
Warrants
Exercise price of warrant | $ / shares			$ 0.001
Common stock issued				1,421,801
Purchase price | $ / shares				$ 10.54
Warrant to purchase shares of common stock			14,413,902
Number of special voting stock | Vote				1
Number of members to elect of board of directors | item				1
March 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

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