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STOCKHOLDER'S EQUITY AND SHARE-BASED COMPENSATION, FINTECH ACQUISITION CORP. II, Warrants (FY) (Details) - $ / shares
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Initial Public Offering [Member] | Maximum [Member]    
Warrants [Abstract]    
Number of business days to file registrant statement 20 days 20 days
Public Warrants [Member]    
Warrants [Abstract]    
Warrants exercisable period on completion of business combination   30 days
Warrants exercisable period from closing of Initial Public Offering   12 months
Warrants expiration period   5 years
Warrants redemption price (in dollars per share)   $ 0.01
Share price (in dollars per share)   $ 24.00
Number of trading days   20 days
Trading day threshold period   30 days
Public Warrants [Member] | Minimum [Member]    
Warrants [Abstract]    
Notice period to redeem warrants   30 days
Private Warrants [Member]    
Warrants [Abstract]    
Warrants exercisable period on completion of business combination   30 days
Period for warrants to become exercisable   5 years