Stockholders' Equity - Restricted Stock and Restricted Stock Units (Q1) (Details) - USD ($)	3 Months Ended	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued	1,061,175	300,450	612,950	156,184
Value of shares issued	$ 973,000	$ 478,000	$ 877,700	$ 512,300
Weighted average estimated fair value	$ 0.92	$ 1.59	$ 1.43	$ 3.28
Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting terms (years)	1 year		1 year
Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting terms (years)	4 years		4 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued	1,379,860	458,245	458,245	325,853
Value of shares issued	$ 1,265,000	$ 729,000	$ 728,600	$ 863,000.0
Weighted average estimated fair value			$ 1.59	$ 2.65
Vesting terms (years)	1 year		1 year

Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Aggregate value of stock related to Restricted Stock Awards issued during the period.

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