401(k) Savings Plan (Details) - Other Pension, Postretirement and Supplemental Plans [Member] - 401K Savings Plan - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Percent of employer's match of the employee's first 1% of eligible pay		100.00%
Percent of employee eligible pay (first 1%)		1.00%
Percent of employer's match of the employee's next 5% of eligible pay		50.00%
Percent of employee eligible pay (next 5%)		5.00%
Maximum employer matching, percent		3.50%
Annual vesting percentage		25.00%
Employer's match after two years (fully vested)		100.00%
Number of years until employer matches 100%		2 years
401(k) matching contributions	$ 306	$ 1,062	$ 1,086	$ 976