Common Stock Incentive Plan - Restricted Stock Units Narrative (Details) - Restricted stock units - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Common Stock Incentive Plan
Expense amortization period (in years)	4 years
Remaining unamortized share-based compensation expense	$ 1.7
Minimum
Common Stock Incentive Plan
Vesting period (in years)	3 years	3 years	3 years
Maximum
Common Stock Incentive Plan
Vesting period (in years)	4 years	4 years	4 years