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Stockholders' Equity (FY) (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Equity [Abstract]    
Schedule of Stock Options and Warrants Activity

The following table summarizes the activity for stock options and warrants for the three months ended March 31, 2022:
 
 ​ ​
Stock Options
 ​ ​
Warrants
 
 ​ ​
Shares
 ​ ​
Weighted
Average
Exercise
Price
 ​ ​
Weighted
Average
Remaining
Contractual
Term
(Years)
 ​ ​
Aggregate
Intrinsic
Value (In
Thousands)
 ​ ​
Shares
 ​ ​
Weighted
Average
Exercise
Price
 ​ ​
Weighted
Average
Remaining
Contractual
Term
(Years)
 ​ ​
Aggregate
Intrinsic
Value (In
Thousands)
Outstanding at December 31, 2021
 ​ ​
2,131,849
 ​ ​
$5.64
 ​ ​
7.97
 ​ ​
$—
 ​ ​
21,356,600
 ​ ​
$2.84
 ​ ​
4.37
 ​ ​
$—
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Changes during the period:
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Granted
 ​ ​
540,600
​ ​
0.91
​ ​
 
 ​ ​
 
 ​ ​
—
​ ​
—
​ ​
 
 ​ ​
 
Exercised
 ​ ​
—
​ ​
—
​ ​
 
 ​ ​
 
 ​ ​
—
​ ​
—
​ ​
 
 ​ ​
 
Forfeited
 ​ ​
(9,565)
 ​ ​
1.90
​ ​
 
 ​ ​
 
 ​ ​
—
​ ​
—
​ ​
 
 ​ ​
 
Expired
 ​ ​
(23,275)
 ​ ​
26.00
​ ​
​ ​
​ ​
—
​ ​
—
​ ​
​ ​
Outstanding at March 31, 2022
 ​ ​
2,639,609
 ​ ​
$4.51
 ​ ​
7.83
 ​ ​
$—
 ​ ​
21,356,600
 ​ ​
$2.84
 ​ ​
4.13
 ​ ​
$—
Vested at March 31, 2022 or expected to vest in the future
 ​ ​
2,594,630
 ​ ​
$4.57
 ​ ​
7.80
 ​ ​
$—
 ​ ​
21,356,600
 ​ ​
$2.84
 ​ ​
4.13
 ​ ​
$—
Vested at March 31, 2022
 ​ ​
1,408,083
 ​ ​
$7.36
 ​ ​
6.41
 ​ ​
$—
 ​ ​
21,356,600
 ​ ​
$2.84
 ​ ​
4.13
 ​ ​
$—

The following table summarizes the activity for stock options and warrants for the year ended December 31, 2021:

 
 ​ ​
Stock Options
​ ​
Warrants
 
 ​ ​
Shares
​ ​
Weighted
Average
Exercise
Price
​ ​
Weighted
Average
Remaining
Contractual
Term
(Years)
​ ​
Aggregate
Intrinsic
Value (In
Thousands)
​ ​
Shares
​ ​
Weighted
Average
Exercise
Price
​ ​
Weighted
Average
Remaining
Contractual
Term
(Years)
​ ​
Aggregate
Intrinsic
Value (In
Thousands)
Outstanding at December 31, 2020
 ​ ​
963,700
 ​ ​
$14.64
 ​ ​
5.86
 ​ ​
$—
 ​ ​
2,638,355
 ​ ​
$2.18
 ​ ​
4.98
 ​ ​
$—
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Changes during the Year:
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
 ​ ​
 
Granted
 ​ ​
1,314,790
 ​ ​
$1.32
 ​ ​
 
 ​ ​
 
 ​ ​
19,519,393
 ​ ​
$2.90
 ​ ​
 
 ​ ​
 
Exercised
 ​ ​
(7,250)
 ​ ​
$3.28
 ​ ​
 
 ​ ​
(3)
 ​ ​
(801,148)
 ​ ​
$2.19
 ​ ​
 
 ​ ​
 
Forfeited
 ​ ​
(29,842)
 ​ ​
$2.18
 ​ ​
 
 ​ ​
 
 ​ ​
—
 ​ ​
$—
 ​ ​
 
 ​ ​
 
Expired
 ​ ​
(109,549)
 ​ ​
$34.12
 ​ ​
​ ​
​ ​
—
 ​ ​
$—
 ​ ​
​ ​
Outstanding at December 31, 2021
 ​ ​
2,131,849
 ​ ​
$5.64
 ​ ​
7.97
 ​ ​
$—
 ​ ​
21,356,600
 ​ ​
$2.84
 ​ ​
4.37
 ​ ​
$—
Vested at December 31, 2021 or expected to vest in the future
 ​ ​
2,120,643
 ​ ​
$5.66
 ​ ​
7.96
 ​ ​
$—
 ​ ​
21,356,600
 ​ ​
$2.84
 ​ ​
4.37
 ​ ​
$—
Exercisable at December 31, 2021
 ​ ​
1,122,783
 ​ ​
$9.26
 ​ ​
6.70
 ​ ​
$—
 ​ ​
21,356,600
 ​ ​
$2.84
 ​ ​
4.37
 ​ ​
$—
Schedule of Restricted Stock

During the three months ended March 31, 2022 and 2021, the Company issued restricted stock for services as follows ($ in thousands):
 
 ​ ​
Three Months Ended
March 31,
 
 ​ ​
2022
 ​ ​
2021
Number of restricted stock issued
 ​ ​
1,061,175
​ ​
300,450
Value of restricted stock issued
 ​ ​
$973
 ​ ​
$478

During the years ended December 31, 2021 and 2020, the Company issued restricted stock for services as follows ($ in thousands, except share data):
 
 ​ ​
2021
 ​ ​
2020
Number of Restricted Stock Issued
 ​ ​
612,950
 ​ ​
156,184
Value of Restricted Stock Issued
 ​ ​
$877.7
 ​ ​
$512.3
Schedule of Restricted Stock Units  

During the years ended December 31, 2021 and 2020, the Company issued restricted stock units for services as follows ($ in thousands, except share data):

 
 ​ ​
2021
 ​ ​
2020
Number of Restricted Stock Units Issued
 ​ ​
458,245
 ​ ​
325,853
Value of Restricted Stock Units Issued
 ​ ​
$728.6
 ​ ​
$863.0