Stock-Based Compensation - Stock Options (Details) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Stock Options, Additional Disclosures
Outstanding, Number, Beginning Balance (in shares)	974,999
Granted (in shares)	40,000
Forfeited/Cancelled (in shares)	(33,334)
Outstanding, Number, Ending Balance (in shares)	981,665		974,999
Vested and expected to vest (in shares)	981,665
Exercisable (in share)	203,332
Outstanding, Weighted Average Exercise Price, Beginning Balance (in dollars per share)	$ 3.99
Granted (in dollars per share)	1.02
Forfeited/Cancelled (in dollars per share)	6.04
Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)	3.80		$ 3.99
Vested and expected to vest (in dollars per share)	3.80
Exercisable (in dollars per share)	$ 7.86
Options, Outstanding, Weighted Average Remaining Contractual Term (years)	9 years 1 month 6 days		9 years 3 months 18 days
Vested and expected to vest (years)	9 years 1 month 6 days
Exercisable (years)	8 years
Stock options | Non Employee Director
Stock Options, Additional Disclosures
Vesting period	3 years
Granted (in shares)	40,000	0
Weighted average fair value per share of options granted	$ 0.70
Maximum | Stock options | 2019 Plan
Stock Options, Additional Disclosures
Expiration period	10 years