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Stockholders' Equity - Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands															12 Months Ended
	Aug. 13, 2021	Jul. 01, 2021	Apr. 01, 2021	Mar. 15, 2021	Dec. 21, 2020	Sep. 28, 2020	Aug. 21, 2020	Apr. 15, 2020	Apr. 01, 2020	Mar. 31, 2020	Mar. 13, 2020	Feb. 28, 2020	Jan. 31, 2020	Jan. 01, 2020	Dec. 31, 2021	Dec. 31, 2020
Other disclosures
Compensation expense															$ 720	$ 850
Employee
Other disclosures
Compensation expense															550	740
Non Management Directors
Other disclosures
Compensation expense															$ 170	$ 110
Employee Stock Option
Number of Options
Outstanding, beginning balance (in shares)															7,179,375
Granted (in shares)															520,390
Canceled (in shares)															8,050
Exercised (in shares)															99,700
Expired/Forfeited (in shares)															(1,961,045)
Outstanding, ending balance (in shares)															5,630,970	7,179,375
Exercisable (in shares)															1,757,636
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)															$ 3.14
Granted (in dollars per share)															1.91
Canceled (in dollars per share)															1.86
Exercised (in dollars per share)															1.77
Expired/Forfeited (in dollars per share)															5.44
Outstanding, ending balance (in dollars per share)															2.25	$ 3.14
Exercisable (in dollars per share)															$ 3.28
Other disclosures
Outstanding Weighted Average Remaining Contractual Life (in Years)															5 years 5 months 15 days	4 years 11 months 4 days
Exercisable Weighted Average Remaining Contractual Life (in Years)															1 year 11 months 26 days
Aggregate Intrinsic Value, Outstanding															$ 0	$ 0
Aggregate Intrinsic Value, Exercisable															$ 0
Vested (in shares)															663,223
Compensation expense															$ 300	$ 200
Unrecognized compensation expense															$ 100
Weighted average period of recognition															1 year 3 months 14 days
Employee Stock Option | Employee
Number of Options
Granted (in shares)	10,000			365,390	25,000	15,000				50,000		50,000
Weighted Average Exercise Price
Granted (in dollars per share)	$ 2.00			$ 1.86	$ 1.09	$ 0.71				$ 0.61		$ 1.40
Other disclosures
Vested (in shares)												0
Award vesting period (in years)						3 years				3 years
Vesting percentage per year	50.00%				50.00%
Employee Stock Option | Another Employee
Number of Options
Granted (in shares)					25,000
Weighted Average Exercise Price
Granted (in dollars per share)					$ 1.09
Other disclosures
Award vesting period (in years)					2 years
Employee Stock Option | Non Management Directors
Number of Options
Granted (in shares)			125,000						200,000
Weighted Average Exercise Price
Granted (in dollars per share)			$ 1.93						$ 0.50
Other disclosures
Vesting percentage per year			50.00%						50.00%
Employee Stock Option | Management
Number of Options
Granted (in shares)		20,000
Weighted Average Exercise Price
Granted (in dollars per share)		$ 2.76
Other disclosures
Vesting percentage per year		50.00%
Employee Stock Option | Board Observer
Number of Options
Granted (in shares)														5,000
Weighted Average Exercise Price
Granted (in dollars per share)														$ 4.00
Other disclosures
Vesting percentage per year														50.00%
Employee Stock Option | Consultant
Number of Options
Granted (in shares)							22,750	13,500					75,000
Weighted Average Exercise Price
Granted (in dollars per share)							$ 1.00	$ 3.00					$ 1.57
Other disclosures
Percentage of options vested per tranche								33.33%
Employee Stock Option | A certain key employee
Number of Options
Granted (in shares)											50,000
Weighted Average Exercise Price
Granted (in dollars per share)											$ 5.50
Employee Stock Option | Five year expiration
Stockholders' Equity
Expiration period															5 years
Employee Stock Option | Seven year expiration
Stockholders' Equity
Expiration period															7 years
Employee Stock Option | Ten year expiration
Stockholders' Equity
Expiration period															10 years

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