Unaudited Condensed Consolidated Statements of Stockholders' Equity and Non-Controlling Interest - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Accumulated deficit	Total stockholders equity	Non-controlling interest
Beginning Balance, Stockholders' equity at Dec. 31, 2017	$ 73,767	$ 16	$ 90,198	$ 1,871	$ (18,852)	$ 73,233	$ 534
Beginning Balances, Stockholders' equity (in shares) at Dec. 31, 2017		16,410
ASC 606 opening balance adjustment	342				342	342
Exercise of stock options and restricted stock grant	111		111			111
Exercise of stock options and restricted stock grant (in shares)		21
Stock-based compensation	363		363			363
Net income (loss)	141				107	107	34
Other comprehensive income(loss)	287			257		257	30
Ending Balances, Stockholders' equity at Mar. 31, 2018	75,011	$ 16	90,672	2,128	(18,403)	74,413	598
Ending Balances, Stockholders' equity (in shares) at Mar. 31, 2018		16,431
Beginning Balance, Stockholders' equity at Dec. 31, 2017	73,767	$ 16	90,198	1,871	(18,852)	73,233	534
Beginning Balances, Stockholders' equity (in shares) at Dec. 31, 2017		16,410
Net income (loss)	3,323
Ending Balances, Stockholders' equity at Sep. 30, 2018	77,770	$ 16	92,408	5	(15,190)	77,239	531
Ending Balances, Stockholders' equity (in shares) at Sep. 30, 2018		16,566
Beginning Balance, Stockholders' equity at Mar. 31, 2018	75,011	$ 16	90,672	2,128	(18,403)	74,413	598
Beginning Balances, Stockholders' equity (in shares) at Mar. 31, 2018		16,431
ASC 606 opening balance adjustment	(1)				(1)	(1)
Exercise of stock options and restricted stock grant	77		77			77
Exercise of stock options and restricted stock grant (in shares)		19
Stock-based compensation	377		377			377
Net income (loss)	1,355				1,416	1,416	(61)
Other comprehensive income(loss)	(2,549)			(2,527)		(2,527)	(22)
Ending Balances, Stockholders' equity at Jun. 30, 2018	74,270	$ 16	91,126	(399)	(16,988)	73,755	515
Ending Balances, Stockholders' equity (in shares) at Jun. 30, 2018		16,450
Exercise of stock options and restricted stock grant	665		665			665
Exercise of stock options and restricted stock grant (in shares)		116
Stock-based compensation	617		617			617
Net income (loss)	1,827				1,798	1,798	29
Other comprehensive income(loss)	391			404		404	(13)
Ending Balances, Stockholders' equity at Sep. 30, 2018	77,770	$ 16	92,408	5	(15,190)	77,239	531
Ending Balances, Stockholders' equity (in shares) at Sep. 30, 2018		16,566
Beginning Balance, Stockholders' equity at Dec. 31, 2018	$ 77,854	$ 16	93,192	(192)	(15,777)	77,239	615
Beginning Balances, Stockholders' equity (in shares) at Dec. 31, 2018	16,587	16,587
Stock-based compensation	$ 825		825			825
Stock-based compensation (in shares)		9
Net income (loss)	(1,457)				(1,638)	(1,638)	181
Other comprehensive income(loss)	(1,125)			(1,124)		(1,124)	(1)
Ending Balances, Stockholders' equity at Mar. 31, 2019	76,097	$ 16	94,017	(1,316)	(17,415)	75,302	795
Ending Balances, Stockholders' equity (in shares) at Mar. 31, 2019		16,596
Beginning Balance, Stockholders' equity at Dec. 31, 2018	$ 77,854	$ 16	93,192	(192)	(15,777)	77,239	615
Beginning Balances, Stockholders' equity (in shares) at Dec. 31, 2018	16,587	16,587
Purchase of non-controlling interest in subsidiary	$ (823)
Net income (loss)	(3,069)
Ending Balances, Stockholders' equity at Sep. 30, 2019	$ 114,396	$ 21	138,860	(5,445)	(19,040)	114,396
Ending Balances, Stockholders' equity (in shares) at Sep. 30, 2019	21,388	21,388
Beginning Balance, Stockholders' equity at Mar. 31, 2019	$ 76,097	$ 16	94,017	(1,316)	(17,415)	75,302	795
Beginning Balances, Stockholders' equity (in shares) at Mar. 31, 2019		16,596
Issuance of common stock in public offering, net of issuance costs	42,509	$ 5	42,504			42,509
Issuance of common stock in public offering, net of issuance costs (in shares)		4,718
Exercise of stock options and restricted stock grant	473		473			473
Exercise of stock options and restricted stock grant (in shares)		55
Stock-based compensation	811		811			811
Stock-based compensation (in shares)		11
Net income (loss)	2,384				2,408	2,408	(24)
Other comprehensive income(loss)	(1,725)			(1,748)		(1,748)	23
Ending Balances, Stockholders' equity at Jun. 30, 2019	120,549	$ 21	137,805	(3,064)	(15,007)	119,755	794
Ending Balances, Stockholders' equity (in shares) at Jun. 30, 2019		21,380
Purchase of non-controlling interest in subsidiary	(950)		(127)			(127)	(823)
Stock-based compensation	1,182		1,182			1,182
Stock-based compensation (in shares)		8
Net income (loss)	(3,996)				(4,033)	(4,033)	37
Other comprehensive income(loss)	(2,389)			(2,381)		(2,381)	$ (8)
Ending Balances, Stockholders' equity at Sep. 30, 2019	$ 114,396	$ 21	$ 138,860	$ (5,445)	$ (19,040)	$ 114,396
Ending Balances, Stockholders' equity (in shares) at Sep. 30, 2019	21,388	21,388