CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid In Capital	Retained Deficit	Accumulated  Other Comp. Loss
Beginning balance (in shares) at Dec. 31, 2018		30,512,843
Beginning balance at Dec. 31, 2018	$ 109,596	$ 318	$ (10,245)	$ 243,007	$ (76,013)	$ (47,471)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	761			761
Total comprehensive loss	9,780				9,986	(206)
Ending balance (in shares) at Mar. 31, 2019		30,512,843
Ending balance at Mar. 31, 2019	120,065	$ 318	(10,245)	243,768	(66,099)	(47,677)
Beginning balance (in shares) at Dec. 31, 2018		30,512,843
Beginning balance at Dec. 31, 2018	109,596	$ 318	(10,245)	243,007	(76,013)	(47,471)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive loss	19,063
Ending balance (in shares) at Sep. 30, 2019		30,581,274
Ending balance at Sep. 30, 2019	130,788	$ 319	(10,245)	245,207	(52,773)	(51,720)
Beginning balance (in shares) at Mar. 31, 2019		30,512,843
Beginning balance at Mar. 31, 2019	120,065	$ 318	(10,245)	243,768	(66,099)	(47,677)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense (in shares)		68,431
Share-based compensation expense	719	$ 1		718
Total comprehensive loss	8,101				6,146	1,955
Ending balance (in shares) at Jun. 30, 2019		30,581,274
Ending balance at Jun. 30, 2019	128,885	$ 319	(10,245)	244,486	(59,953)	(45,722)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	721			721
Total comprehensive loss	1,182				7,180	(5,998)
Ending balance (in shares) at Sep. 30, 2019		30,581,274
Ending balance at Sep. 30, 2019	$ 130,788	$ 319	(10,245)	245,207	(52,773)	(51,720)
Beginning balance (in shares) at Dec. 31, 2019	30,801,255	30,801,255
Beginning balance at Dec. 31, 2019	$ 128,688	$ 323	(11,230)	245,852	(60,307)	(45,950)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense (in shares)		46,014
Share-based compensation expense	862			862
Total comprehensive loss	(32,624)				(24,594)	(8,030)
Ending balance (in shares) at Mar. 31, 2020		30,847,269
Ending balance at Mar. 31, 2020	$ 96,926	$ 323	(11,230)	246,714	(84,901)	(53,980)
Beginning balance (in shares) at Dec. 31, 2019	30,801,255	30,801,255
Beginning balance at Dec. 31, 2019	$ 128,688	$ 323	(11,230)	245,852	(60,307)	(45,950)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense (in shares)		184,414
Share-based compensation expense	2,458	$ (13)		2,471
Total comprehensive loss	$ (35,801)				(32,913)	(2,888)
Ending balance (in shares) at Sep. 30, 2020	30,985,669	30,985,669
Ending balance at Sep. 30, 2020	$ 95,345	$ 310	(11,230)	248,323	(93,220)	(48,838)
Beginning balance (in shares) at Mar. 31, 2020		30,847,269
Beginning balance at Mar. 31, 2020	96,926	$ 323	(11,230)	246,714	(84,901)	(53,980)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense (in shares)		138,400
Share-based compensation expense	854	$ (14)		868
Total comprehensive loss	(9,919)				(12,497)	2,578
Ending balance (in shares) at Jun. 30, 2020		30,985,669
Ending balance at Jun. 30, 2020	87,861	$ 309	(11,230)	247,582	(97,398)	(51,402)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation expense	742	$ 1		741
Total comprehensive loss	$ 6,742				4,178	2,564
Ending balance (in shares) at Sep. 30, 2020	30,985,669	30,985,669
Ending balance at Sep. 30, 2020	$ 95,345	$ 310	$ (11,230)	$ 248,323	$ (93,220)	$ (48,838)