Stock-Based Compensation (Q3) (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2018

Dec. 31, 2017

Stock-Based Compensation [Abstract]

Classification of Stock-Based Compensation Expense

The following table presents the classification of stock-based compensation expense recognized for the periods below:

	Three months ended September 30,					Nine months ended September 30,
(in thousands)	2018			2017		2018		2017
Selling, general and administrative expense	$	440		$	106	$	1,446	$	351
Research and development expense		(3	)		5		98		43
Total stock-based compensation expense	$	437		$	111	$	1,544	$	394

The following table summarizes the stock-based compensation expense which was recognized in the consolidated statements of operations for the years ended December 31,

(Dollars in thousands)	2017		2016
Selling, general and administrative	$	452	$	630
Research and development		50		385
Total	$	502	$	1,015