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RELATED PARTY TRANSACTIONS, FINTECH ACQUISITION CORP. II, Promissory Note and Related Party Loans (FY) (Details) - USD ($)
6 Months Ended 7 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Promissory Note Related Party [Abstract]          
Outstanding expenses related formation and initial public offering $ 0 $ 231,846 $ 0 $ 231,846 $ 0
Sponsor [Member] | Working Capital Loans [Member]          
Promissory Note Related Party [Abstract]          
Outstanding expenses related formation and initial public offering       $ 231,846  
Related Party Transaction, Due from (to) Related Party [Abstract]          
Warrant, exercise price (in dollars per share)       $ 0.75  
Warrants conversion (in shares)       0.5  
Outstanding loan       $ 0 $ 0
Sponsor [Member] | Working Capital Loans [Member] | Maximum [Member]          
Related Party Transaction, Due from (to) Related Party [Abstract]          
Loan commitment amount       1,100,000  
Amounts released for working capital       $ 500,000  
Warrants to purchase shares (in shares)       733,333  
Loans converted into warrants       $ 1,100,000