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Debt (Q3) (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
Aug. 01, 2016
Aug. 28, 2014
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
May 23, 2017
Loan and Security Agreement [Abstract]                    
Payments for debt issuance costs         $ 990,000 $ 0 $ 0 $ 219,042 $ 0  
Repayments of debt         20,000,000 $ 0 $ 0 $ 1,488,558 $ 533,729  
Outstanding debt         $ 0          
Original Loan Agreement [Member]                    
Loan and Security Agreement [Abstract]                    
Aggregate principal amount of borrowing capacity   $ 10,000,000                
Payments for debt issuance costs       $ 90,000            
Additional interest rate charged on due date   1.50%   1.50%            
Amended Loan Agreement [Member]                    
Loan and Security Agreement [Abstract]                    
Aggregate principal amount of borrowing capacity $ 20,000,000                  
Payments for debt issuance costs     $ 900,000              
Additional interest rate charged on due date 4.50%                  
Repayments of debt     20,000,000              
Payments for accrued interest     $ 100,000              
First Term Loan under Amended Loan Agreement [Member]                    
Loan and Security Agreement [Abstract]                    
Face amount $ 15,000,000                  
Second Term Loan under Amended Loan Agreement [Member]                    
Loan and Security Agreement [Abstract]                    
Face amount                   $ 5,000,000