Summary of Significant Accounting Policies (FY) (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2018

Dec. 31, 2017

Summary of Significant Accounting Policies [Abstract]

Potentially Dilutive Securities Excluded from Computations of Diluted Weighted Average Shares Outstanding

The following potentially dilutive securities have been excluded from the computations of diluted weighted average shares outstanding as they would be anti-dilutive:

	As of September 30,
	2018		2017
Stock options to purchase Common Stock		7,149,374		6,387,495
Unvested Restricted Stock Units		601,394		–
Warrants to purchase Common Stock		78,596		376,682
Total		7,829,364		6,764,177

The following potentially dilutive securities have been excluded from the computations of diluted weighted average shares outstanding as they would be anti-dilutive:

	As of December 31,
	2017		2016		2015
Stock options to purchase Common Stock		6,462,795		5,316,511		4,302,267
Warrants to purchase Common Stock		374,653		541,415		600,184
Total		6,837,448		5,857,926		4,902,451