Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Weighted Average Grant Date Fair Value [Abstract]
Stock-based compensation expense	$ 50	$ 9	$ 103	$ 9
Restricted Stock [Member]
Shares [Roll Forward]
Nonvested balance at beginning of period (in shares)			2,245
Issued (in shares)			11,444
Vested (in shares)			0
Forfeited (in shares)			0
Nonvested balance at end of period (in shares)	13,689		13,689		2,245
Weighted Average Grant Date Fair Value [Abstract]
Non-vested balance at beginning of period (in dollars per share)			$ 33.60
Issued (in dollars per share)			26.32
Vested (in dollars per share)			0
Forfeited (in dollars per share)			0
Non-vested balance at end of period (in dollars per share)	$ 27.51		$ 27.51		$ 33.60
Weighted-average remaining vesting period for recognition			1 year 6 months
Fair value of restricted stock granted			$ 301
Unrecognized stock-based compensation expense	$ 257		$ 257
2016 Stock Incentive Plan [Member]
Employee Service Share-based Compensation [Abstract]
Shares available for grant (in shares)	300,000		300,000
ESPP [Member]
Weighted Average Grant Date Fair Value [Abstract]
Discount from market price at date of purchase			5.00%		5.00%
Total stock purchases under the plan (in shares)			2,644
Shares reserved for issuance (in shares)	242,809		242,809
ESPP [Member] | Minimum [Member]
Weighted Average Grant Date Fair Value [Abstract]
Discount from market price at date of purchase			0.00%
ESPP [Member] | Maximum [Member]
Weighted Average Grant Date Fair Value [Abstract]
Discount from market price at date of purchase			15.00%