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Nature of Business and Significant Accounting Policies, Intangible assets and Goodwill (FY) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Impairment charges related to finite-lived intangible assets $ 3,800,000  
Overall discount rate 30.00%  
Amortization expense $ 540,000 $ 278,000
Goodwill [Abstract]    
Goodwill impairment loss $ 200,000  
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life 7 years  
Overall discount rate 30.00%  
Developed Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life 7 years  
Overall discount rate 30.00%  
Trade Names and Trademarks [Member]    
Finite-Lived Intangible Assets [Line Items]    
Estimated useful life 7 years  
Overall discount rate 30.00%