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Stockholders' Equity - Stock Options (Details) - USD ($)			3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 01, 2021	Mar. 15, 2021	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Number of Options
Outstanding, beginning balance (in shares)					7,179,375
Granted (in shares)					490,390
Canceled (in shares)					(8,050)
Exercised (in shares)					92,820
Expired/Forfeited (in shares)					(1,721,070)
Outstanding, ending balance (in shares)			5,847,825		5,847,825		7,179,375
Exercisable (in shares)			1,963,658		1,963,658
Weighted Average Exercise Price
Outstanding, beginning balance (in dollars per share)					$ 3.14
Granted (in dollars per share)					1.88
Canceled (in dollars per share)					1.86
Exercised (in dollars per share)					1.76
Expired/Forfeited (in dollars per share)					5.63
Outstanding, ending balance (in dollars per share)			$ 2.33		2.33		$ 3.14
Exercisable (in dollars per share)			$ 3.42		$ 3.42
Other disclosures
Outstanding Weighted Average Remaining Contractual Life (in Years)					5 years 9 months 10 days		4 years 11 months 4 days
Exercisable Weighted Average Remaining Contractual Life (in Years)					2 years 3 months 29 days
Aggregate Intrinsic Value, Outstanding			$ 2,792,000		$ 2,792,000		$ 0
Aggregate Intrinsic Value, Exercisable			0		0
Employee Stock Option
Other disclosures
Compensation expense			40,000	$ 45,000	198,000	$ 113,000
Unrecognized compensation expense			$ 151,000		$ 151,000
Weighted average period of recognition					1 year 1 month 24 days
Employee Stock Option | Employee
Number of Options
Granted (in shares)		365,390
Weighted Average Exercise Price
Granted (in dollars per share)		$ 1.86
Employee Stock Option | Non Management Directors
Number of Options
Granted (in shares)	125,000
Weighted Average Exercise Price
Granted (in dollars per share)	$ 1.93
Other disclosures
Vesting percentage per year	50.00%
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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