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Related Party Transactions - Narrative (FY) (Details) - IRRAS Sublease
$ in Millions
 1 Months Ended
Jan. 31, 2018
USD ($)
Related Party Transaction [Line Items]  
Future sublease payments receivable from related party $ 0.3
Director | Subsequent Event  
Related Party Transaction [Line Items]  
Sublease, term of contract 2 years
Future sublease payments receivable from related party $ 0.3