Fair Value of Financial Instruments (Q3) (Tables)

9 Months Ended

12 Months Ended

Sep. 30, 2018

Dec. 31, 2017

Fair Value of Financial Instruments [Abstract]

Fair Value of Financial Instruments

	Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active Markets (Level 1)		Quoted Prices in Inactive Markets (Level 2)		Significant Unobservable Inputs (Level 3)
As of September 30, 2018: (unaudited)
Cash and cash equivalents	$	36,814,899	$	36,814,899	$	–	$	–
As of December 31, 2017:
Cash and cash equivalents	$	88,067,647	$	88,067,647	$	–	$	–

	Fair Value Measurements at Reporting Date Using
	Total		Quoted Prices in Active Markets (Level 1)		Quoted Prices in Inactive Markets (Level 2)		Significant Unobservable Inputs (Level 3)
As of December 31, 2017:
Cash and cash equivalents	$	88,067,647	$	88,067,647	$	-	$	-
As of December 31, 2016:
Cash and cash equivalents	$	106,398,919	$	106,398,919	$	-	$	-