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, 2019		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 income (expense) (in shares)		46,014
Share-based compensation income (expense)	862			862
Total comprehensive income (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
Beginning balance at Dec. 31, 2019	128,688	$ 323	(11,230)	245,852	(60,307)	(45,950)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	(35,801)
Ending balance (in shares) at Sep. 30, 2020		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 income (expense) (in shares)		138,400
Share-based compensation income (expense)	854	$ (14)		868
Total comprehensive income (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 income (expense)	742	$ 1		741
Total comprehensive income (loss)	6,742				4,178	2,564
Ending balance (in shares) at Sep. 30, 2020		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 Dec. 31, 2020	31,249,811	31,249,811
Beginning balance at Dec. 31, 2020	$ 95,370	$ 313	(11,893)	249,312	(97,356)	(45,006)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation income (expense) (in shares)		132,034
Share-based compensation income (expense)	967	$ 2		965
Total comprehensive income (loss)	6,278				8,490	(2,212)
Ending balance (in shares) at Mar. 31, 2021		31,381,845
Ending balance at Mar. 31, 2021	$ 102,615	$ 315	(11,893)	250,277	(88,866)	(47,218)
Beginning balance (in shares) at Dec. 31, 2020	31,249,811	31,249,811
Beginning balance at Dec. 31, 2020	$ 95,370	$ 313	(11,893)	249,312	(97,356)	(45,006)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	$ 20,329
Ending balance (in shares) at Sep. 30, 2021	31,569,749	31,569,749
Ending balance at Sep. 30, 2021	$ 120,658	$ 316	(11,966)	254,341	(76,260)	(45,773)
Beginning balance (in shares) at Mar. 31, 2021		31,381,845
Beginning balance at Mar. 31, 2021	102,615	$ 315	(11,893)	250,277	(88,866)	(47,218)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation income (expense) (in shares)		187,904
Share-based compensation income (expense)	2,129	$ 1	(73)	2,201
Total comprehensive income (loss)	6,893				5,095	1,798
Ending balance (in shares) at Jun. 30, 2021		31,569,749
Ending balance at Jun. 30, 2021	111,637	$ 316	(11,966)	252,478	(83,771)	(45,420)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation income (expense)	1,863			1,863
Total comprehensive income (loss)	$ 7,158				7,511	(353)
Ending balance (in shares) at Sep. 30, 2021	31,569,749	31,569,749
Ending balance at Sep. 30, 2021	$ 120,658	$ 316	$ (11,966)	$ 254,341	$ (76,260)	$ (45,773)