Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Prepaid Expenses and Other Current Assets [Abstract]
Income tax receivable		$ 129	$ 129	$ 136
Prepaid expenses		933	933	883
Other current assets		4,200	4,200	535
Total prepaid expenses and other current assets		5,262	5,262	$ 1,554
Employee Retention Credits [Member]
Employee Retention Credits [Abstract]
Refund of employee retention credit received		$ 200	$ 900
Employee Retention Credits [Member] | Subsequent Event [Member]
Employee Retention Credits [Abstract]
Refund of employee retention credit received	$ 1,100