Stockholders' Equity (Options) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Stock options
Number of options
Balance at the beginning of period (in shares)			1,703,963
Options granted (in shares)			150,000
Options forfeited (in shares)			(73,637)
Balance at the end of the period (in shares)	1,780,326		1,780,326		1,703,963
Weighted average exercise price
Balance at the beginning of period (in dollars per share)			$ 4.75
Options forfeited (in dollars per share)			5.10
Balance at the end of period (in dollars per share)	$ 4.34		$ 4.34		$ 4.75
Additional information
Weighted average remaining contractual term			5 years 6 months 3 days		5 years 4 months 28 days
Stock-based compensation expense	$ 0.2	$ 0.3	$ 0.2	$ 0.3
Unrecognized compensation costs (in dollars)	$ 1.5		$ 1.5
2014 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grants	1,866,579		1,866,579
Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares available for future grants	312,943		312,943
Number of shares awarded			2,342,893
Grant period of stock awards			10 years
Number of additional years of requisite service period			3 years
Vesting period			1 year
Inducement Plan | On the first anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage			25.00%
Inducement Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price of awards expressed as a percentage of fair value of shares on the date of grant			100.00%
Percentage of possible payouts of the target award			0.00%
Inducement Plan | Minimum | Individual options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage			25.00%
Inducement Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of possible payouts of the target award			100.00%
2007 Plan and 2014 Plan | Stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grant period of stock awards			10 years
2007 Plan and 2014 Plan | Stock options | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price of awards expressed as a percentage of fair value of shares on the date of grant			100.00%
Percentage of voting power owned by shareholder	10.00%		10.00%
2007 Plan and 2014 Plan | Stock options | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price of awards expressed as a percentage of fair value of shares on the date of grant			110.00%