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, 2018	$ 77,854	$ 16	$ 93,192	$ (192)	$ (15,777)	$ 77,239	$ 615
Beginning Balances, Stockholders' equity (in shares) at Dec. 31, 2018		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
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
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
Net income (loss)	(13,300)
Ending Balances, Stockholders' equity at Dec. 31, 2019	$ 106,548	$ 21	139,700	(3,939)	(29,234)	106,548
Ending Balances, Stockholders' equity (in shares) at Dec. 31, 2019	21,419	21,419
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 awards and employee stock plan purchases	473		473			473
Exercise of stock awards and employee stock plan purchases (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
Beginning Balance, Stockholders' equity at Dec. 31, 2019	$ 106,548	$ 21	139,700	(3,939)	(29,234)	106,548
Beginning Balances, Stockholders' equity (in shares) at Dec. 31, 2019	21,419	21,419
Exercise of stock awards and employee stock plan purchases	$ 709		709			709
Exercise of stock awards and employee stock plan purchases (in shares)		94
Stock-based compensation	782		782			782
Net income (loss)	(8,771)				(8,771)	(8,771)
Other comprehensive income (loss)	(1,979)			(1,979)		(1,979)
Ending Balances, Stockholders' equity at Mar. 31, 2020	97,289	$ 21	141,191	(5,918)	(38,005)	97,289
Ending Balances, Stockholders' equity (in shares) at Mar. 31, 2020		21,513
Beginning Balance, Stockholders' equity at Dec. 31, 2019	$ 106,548	$ 21	139,700	(3,939)	(29,234)	106,548
Beginning Balances, Stockholders' equity (in shares) at Dec. 31, 2019	21,419	21,419
Net income (loss)	$ (9,042)
Ending Balances, Stockholders' equity at Sep. 30, 2020	$ 100,845	$ 22	144,272	(5,173)	(38,276)	100,845
Ending Balances, Stockholders' equity (in shares) at Sep. 30, 2020	21,622	21,622
Beginning Balance, Stockholders' equity at Mar. 31, 2020	$ 97,289	$ 21	141,191	(5,918)	(38,005)	97,289
Beginning Balances, Stockholders' equity (in shares) at Mar. 31, 2020		21,513
Exercise of stock awards and employee stock plan purchases	284		284			284
Exercise of stock awards and employee stock plan purchases (in shares)		46
Stock-based compensation	868		868			868
Net income (loss)	(156)				(156)	(156)
Other comprehensive income (loss)	(367)			(367)		(367)
Ending Balances, Stockholders' equity at Jun. 30, 2020	97,918	$ 21	142,343	(6,285)	(38,161)	97,918
Ending Balances, Stockholders' equity (in shares) at Jun. 30, 2020		21,559
Exercise of stock awards and employee stock plan purchases	270	$ 1	269			270
Exercise of stock awards and employee stock plan purchases (in shares)		39
Stock-based compensation	1,660		1,660			1,660
Stock-based compensation (in shares)		24
Net income (loss)	(115)				(115)	(115)
Other comprehensive income (loss)	1,112			1,112		1,112
Ending Balances, Stockholders' equity at Sep. 30, 2020	$ 100,845	$ 22	$ 144,272	$ (5,173)	$ (38,276)	$ 100,845
Ending Balances, Stockholders' equity (in shares) at Sep. 30, 2020	21,622	21,622