Share-Based Compensation - Summary of Stock Option Activity (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Options Outstanding
Beginning balance (in shares)	21,843,781
Granted (in shares)	430,000
Expired (in shares)	(589,374)
Forfeited (in shares)	(103,410)
Ending balance (in shares)	21,580,997		21,843,781
Vested at end of period (in shares)	15,201,625
Expected to vest at end of period (in shares)	6,379,372
Weighted Average Exercise Price
Beginning balance (in dollars per share)	$ 1.74
Granted (in dollars per share)	1.01
Expired (in dollars per share)	2.54
Forfeited (in dollars per share)	2.33
Ending balance (in dollars per share)	1.71		$ 1.74
Vested at end of period (in dollars per share)	1.51
Expected to vest at end of period (in dollars per share)	$ 2.18
Weighted Average Remaining Contractual Life (Years)
Outstanding	8 years 3 months 7 days		0 years
Vested at end of period (in years)	7 years 10 months 9 days
Expected to vest at end of period (in years)	9 years 3 months
Aggregate Intrinsic Value
Outstanding at beginning period	$ 0
Exercised	0	$ 500,000
Outstanding at end of period	4,047,624		$ 0
Vested at end of period	3,755,918
Expected to vest at end of period	$ 291,706