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SUBSEQUENT EVENTS - FINTECH MERGER (Details) - USD ($)
$ / shares in Units, $ in Millions
Jul. 20, 2018
Jun. 30, 2018
Dec. 31, 2017
Fintech Merger [Abstract]      
Common shares, outstanding (in shares)   10 10
Subsequent Event [Member]      
Fintech Merger [Abstract]      
Common shares, outstanding (in shares) 36,182,783    
Warrants to purchase common stock (in shares) 8,959,999    
Shares reserved for issuance (in shares) 3,371,389    
Percentage of outstanding common stock owned 48.30%    
Subsequent Event [Member] | Stock Option [Member] | 2018 Equity Compensation Plan [Member]      
Fintech Merger [Abstract]      
Options granted (in shares) 2,763,219    
Subsequent Event [Member] | Restricted Stock Units [Member] | 2018 Equity Compensation Plan [Member]      
Fintech Merger [Abstract]      
Restricted stock units granted (in shares) 21,189    
Subsequent Event [Member] | FinTech [Member]      
Fintech Merger [Abstract]      
Number of shares redeemed (in shares) 4,938,232    
Common stock, redemption price per share (in dollars per share) $ 10.086957    
Common stock, redemption price $ 49.8    
Consideration paid in cash $ 102.0    
Consideration paid in equity (in shares) 17,200,000    
Percentage of outstanding common stock owned 51.70%