Stock-Based Compensation (FY) (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2018

Dec. 31, 2017

Stock-Based Compensation [Abstract]

Summary 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

Summary of Plan Stock Option Activity

The following is a summary of the Plans’ stock option activity during the years ended December 31:

	2017					2016
	Options Outstanding			Weighted Average Exercise Price		Options Outstanding			Weighted Average Exercise Price
Beginning Balance		4,354		$	2,295.37		3,260		$	3,664.61
Granted		34,651		$	11.57		2,257		$	543.63
Exercised		—			—		—			—
Forfeited/expired		(2,643	)	$	2,666.48		(1,163	)	$	2,729.60
Outstanding at December 31		36,362		$	91.48		4,354		$	2,295.37
Vested at December 31		2,344		$	964.27		2,134		$	3,780.79

Schedule of Weighted Average Assumptions used in Black-Scholes Option Pricing Model

The following table provides the weighed average assumptions used in the Black-Scholes option pricing model for the years ended December 31:

	2017			2016
Expected dividend yield		0	%		0	%
Risk-free interest rate		1.97	%		1.71	%
Expected volatility		103	%		86	%
Expected life (in years)		6.25			6.25

Summary of Restricted Stock Award Activity

The following table summarizes restricted stock award activity during 2017 and 2016:

	2017					2016
	RSUs			Weighted Average Grant Price		RSUs			Weighted Average Grant Price
Nonvested, beginning balance		499		$	583.29		15		$	2,574.00
Granted		138		$	108.20		1,131		$	553.88
Vested		(392	)	$	132.70		(619	)	$	443.40
Forfeited		—			—		(28	)	$	426.00
Nonvested at December 31		245		$	521.23		499		$	583.29