Accounting for Share-Based Payments - Stock Option Activity (Details) - Stock options - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Number of Options
Balance outstanding at the beginning of the period (in shares)	8,774,974
Granted (in shares)	0
Exercised (in shares)	0
Forfeited (in shares)	0
Cancelled (in shares)	0
Balance outstanding at the end of the period (in shares)	8,774,974	8,774,974
Awards outstanding, vested awards and those expected to vest at the end of the period (in shares)	8,624,464
Vested and exercisable at the end of the period (in shares)	1,351,040
Weighted Average Exercise Price Per Share
Balance outstanding at the beginning of the period (in dollars per share)	$ 2.33
Granted (in dollars per share)	0
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	0
Cancelled (in dollars per share)	0
Balance outstanding at the end of the period (in dollars per share)	2.33	$ 2.33
Awards outstanding, vested awards and those expected to vest at the end of the period (in dollars per share)	2.34
Vested and exercisable at the end of the period (in dollars per share)	$ 5.22
Intrinsic Value
Balance outstanding at the beginning of the period	$ 0
Granted	0
Exercised	0
Forfeited	0
Cancelled	0
Balance outstanding at the end of the period	0	$ 0
Awards outstanding, vested awards and those expected to vest at the end of the period	0
Vested and exercisable at the end of the period	$ 0
Weighted Average Remaining Contractual Team
Balance outstanding term (in years)	8 years 10 months 9 days	9 years 1 month 6 days
Awards outstanding, vested awards and those expected to vest at the end of the period (in years)	8 years 10 months 9 days
Vested and exercisable at the end of the period (in years)	8 years 1 month 28 days
Exercise price range one
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)	$ 1.63	$ 1.63
Exercise price, high end of the range (in dollars per share)	2,016	$ 2,016
Exercise price range two
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)	0
Exercise price, high end of the range (in dollars per share)	0
Exercise price range three
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)	0
Exercise price, high end of the range (in dollars per share)	0
Exercise price range four
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)	1.63
Exercise price, high end of the range (in dollars per share)	$ 2,016