Stock-Based Compensation - RSU activity (Details) - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Stock-Based Compensation
Number of Shares, Non-vested at beginning of period	551,083	469,000
Number of Shares, Granted RSUs	333,500	310,000
Number of Shares, Vested	(286,084)	(227,917)
Number of Shares, Non-vested at end of period	598,499	551,083
Weighted Average Fair Value at Grant Date, Non-vested at beginning of period	$ 2.14	$ 3.43
Weighted Average Fair Value at Grant Date, Granted RSUs	1.84	1.25
Weighted Average Fair Value at Grant Date, Vested	2.20	3.59
Weighted Average Fair Value at Grant Date, Non-vested at end of period	$ 1.80	$ 2.14