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Equity, Warrants (Q3) (Details)
$ / shares in Units, $ in Thousands
2 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 10, 2017
USD ($)
$ / shares
shares
Nov. 03, 2016
USD ($)
$ / shares
shares
Jul. 26, 2016
USD ($)
$ / shares
shares
Mar. 31, 2017
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Feb. 15, 2017
Warrants and Rights Disclosure [Abstract]                      
Proceeds from exercise of warrants             $ 0 $ 1,981 $ 1,989 $ 0  
Warrants outstanding                 0 1,843  
Change in fair value of warrant liability         $ 0 $ 4 0 1,470 1,475 $ 818  
Risk-Free Interest Rate [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants measurement input   0.0133 0.0094                
Risk-Free Interest Rate [Member] | Minimum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants measurement input                   0.0147 0.0145
Risk-Free Interest Rate [Member] | Maximum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants measurement input                   0.0196 0.0199
Expected Warrant Option Life [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Expected warrant option life   5 years 6 months 3 years 6 months                
Expected Warrant Option Life [Member] | Minimum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Expected warrant option life                   3 years 1 month 6 days 2 years 10 months 2 days
Expected Warrant Option Life [Member] | Maximum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Expected warrant option life                   5 years 3 months 18 days 5 years 6 months
Replacement Warrants [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants outstanding         $ 500   $ 500   $ 500    
Replacement Warrants [Member] | Expected Dividend Yield [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants measurement input         0   0   0    
Replacement Warrants [Member] | Expected Stock Price Volatility [Member] | Minimum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants measurement input         0.4965   0.4965   0.4965    
Replacement Warrants [Member] | Expected Stock Price Volatility [Member] | Maximum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants measurement input         0.5038   0.5038   0.5038    
Replacement Warrants [Member] | Risk-Free Interest Rate [Member] | Minimum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants measurement input         0.0195   0.0195   0.0195    
Replacement Warrants [Member] | Risk-Free Interest Rate [Member] | Maximum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants measurement input         0.0197   0.0197   0.0197    
Replacement Warrants [Member] | Expected Warrant Option Life [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Expected warrant option life         5 years   5 years   5 years    
Series B Convertible Preferred Stock [Member] | Investor Warrants [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants issuance cost     $ 0                
Warrants to purchase shares of common stock (in shares) | shares     6,149                
Exercise price of warrants (in dollars per share) | $ / shares     $ 564                
Warrants exercisable period             36 months   36 months    
Period warrants became exercisable from closing date             6 months   6 months    
Series D Convertible Preferred Stock [Member] | Investor Warrants [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants issuance cost $ 0                    
Warrants to purchase shares of common stock (in shares) | shares 1,961                    
Exercise price of warrants (in dollars per share) | $ / shares $ 108                    
Warrants exercisable period             60 months   60 months    
Period warrants became exercisable from closing date             6 months   6 months    
Series C and D Convertible Preferred Stock [Member] | Investor Warrants [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants issuance cost   $ 0                  
Warrants to purchase shares of common stock (in shares) | shares   35,295                  
Exercise price of warrants (in dollars per share) | $ / shares   $ 108                  
Adjusted exercise price of warrants (in dollars per share) | $ / shares   $ 102                  
Series B, C And D Convertible Preferred Stock [Member] | Placement Agent Warrant [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants issuance cost             $ 0        
Warrants to purchase shares of common stock (in shares) | shares         2,605   2,605        
Expiration term of warrants             5 years        
Series B, C And D Convertible Preferred Stock [Member] | Placement Agent Warrant [Member] | Minimum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Exercise price of warrants (in dollars per share) | $ / shares         $ 126.0   $ 126.0        
Series B, C And D Convertible Preferred Stock [Member] | Placement Agent Warrant [Member] | Maximum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Exercise price of warrants (in dollars per share) | $ / shares         $ 810.0   $ 810.0        
Warrant Exercise Agreement [Member] | Original Warrants [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Proceeds from exercise of warrants       $ 2,000              
Warrants outstanding         $ 0   $ 0   $ 0    
Relinquished amount of warrants               $ 100 $ 100    
Warrant Exercise Agreement [Member] | Replacement Warrants [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Warrants to purchase shares of common stock (in shares) | shares       43,396              
Warrant Exercise Agreement [Member] | Replacement Warrants [Member] | Minimum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Exercise price of warrants (in dollars per share) | $ / shares       $ 34.6              
Warrant Exercise Agreement [Member] | Replacement Warrants [Member] | Maximum [Member]                      
Warrants and Rights Disclosure [Abstract]                      
Exercise price of warrants (in dollars per share) | $ / shares       $ 99.8