Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	No Par, Common Stock	Accumulated deficit	Accumulated Other Comprehensive Income (Loss)	Private placement	Private placement No Par, Common Stock
Balance at beginning of period (in shares) at Dec. 31, 2016		7,633,070
Balance at beginning of period at Dec. 31, 2016	$ 67,794	$ 80,342	$ (11,468)	$ (1,080)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(21,763)
Issuance of common stock in private placement (in shares)						800,000
Issuance of common stock in private placement					$ 5,000	$ 5,000
Common stock issuance costs	(13)	$ (13)
Restricted stock unit expense, net (in shares)		85,418
Restricted stock unit expense, net	650	$ 650
Other comprehensive income (loss)	826			826
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes				0
Balance at end of period (in shares) at Sep. 30, 2017		8,518,488.000
Balance at end of period at Sep. 30, 2017	52,494	$ 85,979	(33,231)	(254)
Balance at beginning of period at Jun. 30, 2017				(507)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(18,898)
Other comprehensive income (loss)	253
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes				0
Balance at end of period (in shares) at Sep. 30, 2017		8,518,488.000
Balance at end of period at Sep. 30, 2017	52,494	$ 85,979	(33,231)	(254)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of adoption of ASU No. 2016-01, net of taxes	0		556	(556)
Balance at beginning of period (in shares) at Dec. 31, 2017		8,520,328.000
Balance at beginning of period at Dec. 31, 2017	52,826	$ 86,199	(33,010)	(363)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(4,451)
Restricted stock unit expense, net (in shares)		82,375
Restricted stock unit expense, net	716	$ 716
Other comprehensive income (loss)	(2,552)
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes	0		(77)	77
Balance at end of period (in shares) at Sep. 30, 2018		8,602,703
Balance at end of period at Sep. 30, 2018	46,539	$ 86,915	(36,982)	(3,394)
Balance at beginning of period at Jun. 30, 2018				(3,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(3,551)
Other comprehensive income (loss)	(334)
Plus: cumulative effect of adoption of ASU No. 2018-02, net of taxes				0
Balance at end of period (in shares) at Sep. 30, 2018		8,602,703
Balance at end of period at Sep. 30, 2018	$ 46,539	$ 86,915	$ (36,982)	$ (3,394)