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		30,513,000
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	9,780				9,986	(206)
Ending balance (in shares) at Mar. 31, 2019		30,513,000
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		30,513,000
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	17,881
Ending balance (in shares) at Jun. 30, 2019		30,581,000
Ending balance at Jun. 30, 2019	128,885	$ 319	(10,245)	244,486	(59,953)	(45,722)
Beginning balance (in shares) at Mar. 31, 2019		30,513,000
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)		68,000
Total comprehensive loss	8,101				6,146	1,955
Ending balance (in shares) at Jun. 30, 2019		30,581,000
Ending balance at Jun. 30, 2019	$ 128,885	$ 319	(10,245)	244,486	(59,953)	(45,722)
Beginning balance (in shares) at Dec. 31, 2019	30,801,255	30,801,000
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)		46,000
Share-based compensation expense	862			862
Total comprehensive loss	(32,624)				(24,594)	(8,030)
Ending balance (in shares) at Mar. 31, 2020		30,847,000
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	30,801,000
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)		184,000
Share-based compensation expense	1,716	$ (14)		1,730
Total comprehensive loss	$ (42,543)				(37,091)	(5,452)
Ending balance (in shares) at Jun. 30, 2020	30,985,669	30,985,000
Ending balance at Jun. 30, 2020	$ 87,861	$ 309	(11,230)	247,582	(97,398)	(51,402)
Beginning balance (in shares) at Mar. 31, 2020		30,847,000
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)		138,000
Share-based compensation expense	854			868
Total comprehensive loss	$ (9,919)				(12,497)	2,578
Ending balance (in shares) at Jun. 30, 2020	30,985,669	30,985,000
Ending balance at Jun. 30, 2020	$ 87,861	$ 309	$ (11,230)	$ 247,582	$ (97,398)	$ (51,402)