Stockholder's Equity - Inducement Plan Options Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Aggregate Intrinsic Value
Stock based compensation expense	$ 800	$ 200
Compensation cost not yet recognized	4,100
Options to purchase common stock
Aggregate Intrinsic Value
Stock based compensation expense	100
Compensation cost not yet recognized	$ 300
Inducement Equity Incentive Plan
Number of Shares
Outstanding at beginning of period (in shares)	56,500
Options granted (in shares)	0
Exercised (in shares)	0
Forfeited (in shares)	0
Outstanding at end of period (in shares)	56,500		56,500
Weighted- average Exercise Price
Outstanding at beginning of period (in dollars per share)	$ 16.41
Granted (in dollars per share)	0
Exercised (in dollars per share)	0
Forfeited (in dollars per share)	0
Outstanding at end of period (in dollars per share)	$ 16.41		$ 16.41
Weighted- average Remaining Contractual Term
Outstanding	9 years 3 months 18 days		9 years 6 months 18 days
Aggregate Intrinsic Value
Outstanding	$ 283		$ 973