Registration of securities issued in business combination transactions

RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS - Impact of restatement (FY) (Details)

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RESTATEMENT OF PREVIOUSLY ISSUED FINANCIAL STATEMENTS - Impact of restatement (FY) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Aug. 18, 2020
Jun. 30, 2020
Mar. 31, 2020
BALANCE SHEETS                        
Class A common stock subject to possible redemption   $ 230,000,000     $ 230,000,000   $ 230,000,000 $ 230,000,000 $ 230,000,000 $ 200,000,000    
Common stock         65     65   65    
Additional paid-in capital                 0      
Accumulated deficit $ (1,000) (20,735,459)     (19,823,320)   (20,735,459) (19,823,320) (21,431,991) (18,557,577)    
Total Stockholders' Equity (Deficit) (1,000) (20,734,819) $ (21,459,076) $ (16,789,641) (19,822,680) $ (21,459,076) (20,734,819) (19,822,680) (21,431,351) (18,556,937) $ 24,000 $ 24,000
STATEMENT OF CASH FLOWS                        
Initial classification of Class A common stock subject to possible redemption               230,000,000 230,000,000      
STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)                        
Class A common stock subject to possible redemption                 (25,517,456)      
Accretion to common stock subject to redemption amount         25,517,456              
Total Stockholders' Equity $ (1,000) (20,734,819) (21,459,076) (16,789,641) $ (19,822,680) (21,459,076) (20,734,819) $ (19,822,680) (21,431,351) (18,556,937) $ 24,000 $ 24,000
Class A Common Stock                        
BALANCE SHEETS                        
Common stock   $ 65         $ 65   $ 65      
STATEMENTS OF OPERATIONS                        
Weighted average shares outstanding, basic   23,650,000     10,858,152   23,650,000 3,645,803 8,674,180      
Weighted average shares outstanding, diluted 0 23,650,000     10,858,152   23,650,000 3,645,803 8,674,180      
Basic net income per common share $ 0.00 $ 0.02     $ (0.03)   $ 0.02 $ (0.05) $ (0.15)      
Diluted net income per common share $ 0.00 $ 0.02     $ (0.03)   $ 0.02 $ (0.05) $ (0.15)      
Class B Common Stock                        
BALANCE SHEETS                        
Common stock   $ 575         $ 575   $ 575      
STATEMENTS OF OPERATIONS                        
Weighted average shares outstanding, basic   5,750,000     5,301,630   5,750,000 4,918,796 5,127,732      
Weighted average shares outstanding, diluted 0 5,750,000     5,301,630   5,750,000 4,918,796 5,127,732      
Basic net income per common share $ 0.00 $ 0.02     $ (0.03)   $ 0.02 $ (0.05) $ (0.15)      
Diluted net income per common share $ 0.00 $ 0.02     $ (0.03)   $ 0.02 $ (0.05) $ (0.15)      
As Previously Reported                        
BALANCE SHEETS                        
Additional paid-in capital     7,089,593 2,420,210 $ 5,453,221 7,089,593   $ 5,453,221 $ 7,061,874 5,837,483    
Accumulated deficit     (2,090,494) 2,578,941 (454,099) (2,090,494)   (454,099) (2,062,769) (838,356)    
Total Stockholders' Equity (Deficit)     5,000,004 5,000,009 5,000,010 5,000,004   5,000,010 5,000,009 5,000,003    
STATEMENT OF CASH FLOWS                        
Initial classification of Class A common stock subject to possible redemption               204,793,060 204,793,060      
Change in value of Class A common stock subject to possible redemption       4,641,710   (27,720)   384,250 (1,224,420)      
STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)                        
Sale of 23,000,000 Units, net of underwriting discounts               204,482,544 204,482,544      
Change in value of common stock subject to possible redemption       (4,641,710)   4,669,430     1,608,670      
Class A common stock subject to possible redemption               (205,177,310) (205,177,310)      
Total Stockholders' Equity     5,000,004 5,000,009 5,000,010 5,000,004   5,000,010 5,000,009 5,000,003    
As Previously Reported | Class A Common Stock                        
BALANCE SHEETS                        
Common stock     $ 330 $ 283 $ 313 $ 330   $ 313 $ 329 301    
STATEMENTS OF OPERATIONS                        
Weighted average shares outstanding, basic     20,821,035   18,952,768 21,926,782   18,952,768 20,323,974      
Weighted average shares outstanding, diluted     20,821,035 21,693,414 18,952,768 21,926,782   18,952,768 20,323,974      
As Previously Reported | Class A Common Stock Subject to Redemption [Member]                        
BALANCE SHEETS                        
Class A common stock subject to possible redemption     $ 203,540,920 $ 208,210,350 $ 205,177,310 $ 203,540,920   $ 205,177,310 $ 203,568,640 176,443,060    
STATEMENT OF CASH FLOWS                        
Initial classification of Class A common stock subject to possible redemption               204,793,060 204,793,060      
Change in value of Class A common stock subject to possible redemption               384,250 $ (1,224,420)      
STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)                        
Class A common stock subject to possible redemption               $ (205,177,310)        
As Previously Reported | Class B Common Stock                        
STATEMENTS OF OPERATIONS                        
Weighted average shares outstanding, basic     8,485,715 9,043,136 3,374,881 8,809,768   3,424,425 2,318,726      
Weighted average shares outstanding, diluted     8,485,715   3,374,881 8,809,768   3,424,425 2,318,726      
Basic net income per common share     $ (0.54) $ 0.51         $ (0.89)      
Diluted net income per common share     $ (0.54)           $ (0.89)      
Adjustment                        
BALANCE SHEETS                        
Additional paid-in capital     $ (7,089,593) $ (2,420,210) $ (5,453,221) $ (7,089,593)   $ (5,453,221) $ (7,061,874) (5,837,483)    
Accumulated deficit     (19,369,222) (19,369,222) (19,369,221) (19,369,222)   (19,369,221) (19,369,222) (17,719,221)    
Total Stockholders' Equity (Deficit)     (26,459,080) (21,789,650) $ (24,822,690) (26,459,080)   (24,822,690) (26,431,360) (23,556,940)    
STATEMENTS OF OPERATIONS                        
Basic net income per common share         $ (0.03)              
Diluted net income per common share         $ (0.03)              
STATEMENT OF CASH FLOWS                        
Initial classification of Class A common stock subject to possible redemption               25,206,940 25,206,940      
Change in value of Class A common stock subject to possible redemption       (4,641,710)   27,720   (384,250) 1,224,420      
STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)                        
Sale of 23,000,000 Units, net of underwriting discounts               (204,482,544) (204,482,544)      
Change in value of common stock subject to possible redemption       (4,641,710)   (4,669,430)     (1,608,670)      
Class A common stock subject to possible redemption               205,177,310 205,177,310      
Accretion to common stock subject to redemption amount               (25,517,456) (25,517,456)      
Total Stockholders' Equity     (26,459,080) (21,789,650) $ (24,822,690) (26,459,080)   (24,822,690) (26,431,360) (23,556,940)    
Adjustment | Class A Common Stock                        
BALANCE SHEETS                        
Common stock     $ (265) $ (218) $ (248) $ (265)   $ (248) $ (264) (236)    
STATEMENTS OF OPERATIONS                        
Weighted average shares outstanding, basic     2,828,965   (8,094,616) 1,723,218   (15,306,965) (11,649,794)      
Weighted average shares outstanding, diluted     2,828,965 1,956,586 (8,094,616) 1,723,218   (15,306,965) (11,649,794)      
Basic net income per common share     $ (0.16)   $ (0.03)     $ (0.05) $ (0.15)      
Diluted net income per common share     $ (0.16) $ 0.16 $ (0.03)     $ (0.05) $ (0.15)      
Adjustment | Class A Common Stock Subject to Redemption [Member]                        
BALANCE SHEETS                        
Class A common stock subject to possible redemption     $ 26,459,080 $ 21,789,650 $ 24,822,690 $ 26,459,080   $ 24,822,690 $ 26,431,360 $ 23,556,940    
STATEMENT OF CASH FLOWS                        
Initial classification of Class A common stock subject to possible redemption               25,206,940 25,206,940      
Change in value of Class A common stock subject to possible redemption               (384,250) $ 1,224,420      
STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT)                        
Class A common stock subject to possible redemption               $ 205,177,310        
Adjustment | Class B Common Stock                        
STATEMENTS OF OPERATIONS                        
Weighted average shares outstanding, basic     (2,735,715) (3,293,136) (1,926,749) (3,059,768)   1,494,371 2,809,006      
Weighted average shares outstanding, diluted     (2,735,715)   (1,926,749) (3,059,768)   1,494,371 2,809,006      
Basic net income per common share     $ 0.38 $ (0.35) $ (0.03)     $ (0.05) $ 0.74      
Diluted net income per common share     $ 0.38   $ (0.03)     $ (0.05) $ 0.74