CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Common Stock Adjusted Balance	Common Stock	Additional Paid-in Capital Adjusted Balance	Additional Paid-in Capital	Accumulated Other Comprehensive Loss Adjusted Balance	Accumulated Other Comprehensive Loss	Accumulated Deficit Cumulative effect of a change in accounting	Accumulated Deficit Adjusted Balance	Accumulated Deficit	Treasury Stock Adjusted Balance	Treasury Stock	Cumulative effect of a change in accounting	Adjusted Balance	Total
Balance (ASU 2016-02) at Dec. 31, 2018							$ 1,547					$ 1,547
Balance at Dec. 31, 2018	$ 371	$ 371	$ 343,955	$ 343,955	$ (4,531)	$ (4,531)		$ (359,476)	$ (361,023)	$ (696)	$ (696)		$ (20,377)	$ (21,924)
Balance (in shares) at Dec. 31, 2018	36,921	36,921
Increase (Decrease) in Stockholders' Equity
Net income (loss)									(6,951)					(6,951)
Share based compensation expense				3,265										3,265
Issuance of common stock upon vesting of restricted stock units		$ 3		(3)
Issuance of common stock upon vesting of restricted stock units (in shares)		350
Effect of shares withheld to cover taxes				(3,626)										(3,626)
Total other comprehensive loss						(2,930)								(2,930)
Balance at Mar. 31, 2019		$ 374		343,591		(7,461)			(366,427)		(696)			(30,619)
Balance (in shares) at Mar. 31, 2019		37,271
Balance (ASU 2016-02) at Dec. 31, 2018							1,547					1,547
Balance at Dec. 31, 2018	$ 371	$ 371	343,955	343,955	(4,531)	(4,531)		(359,476)	(361,023)	(696)	(696)		(20,377)	(21,924)
Balance (in shares) at Dec. 31, 2018	36,921	36,921
Increase (Decrease) in Stockholders' Equity
Net income (loss)														8,775
Total other comprehensive loss														(9,246)
Balance at Sep. 30, 2019		$ 375		350,579		(13,777)			(350,701)		(696)			(14,220)
Balance (in shares) at Sep. 30, 2019		37,362
Balance at Mar. 31, 2019		$ 374		343,591		(7,461)			(366,427)		(696)			(30,619)
Balance (in shares) at Mar. 31, 2019		37,271
Increase (Decrease) in Stockholders' Equity
Net income (loss)									10,035					10,035
Share based compensation expense				3,450										3,450
Issuance of common stock upon vesting of restricted stock units		$ 1		(1)
Issuance of common stock upon vesting of restricted stock units (in shares)		64
Effect of shares withheld to cover taxes				(28)										(28)
Total other comprehensive loss						(4,682)								(4,682)
Balance at Jun. 30, 2019		$ 375		347,012		(12,143)			(356,392)		(696)			(21,844)
Balance (in shares) at Jun. 30, 2019		37,335
Increase (Decrease) in Stockholders' Equity
Net income (loss)									5,691					5,691
Share based compensation expense				3,374										3,374
Issuance in connection with the exercise of stock options				249										249
Issuance in connection with the exercise of stock options (in shares)		20
Issuance of common stock upon vesting of restricted stock units (in shares)		7
Effect of shares withheld to cover taxes				(56)										(56)
Total other comprehensive loss						(1,634)								(1,634)
Balance at Sep. 30, 2019		$ 375		350,579		(13,777)			(350,701)		(696)			(14,220)
Balance (in shares) at Sep. 30, 2019		37,362
Balance (ASU 2016-13) at Dec. 31, 2019							(238)					(238)
Balance at Dec. 31, 2019	$ 376	$ 376	354,326	354,326	(12,551)	(12,551)		(332,189)	(331,951)	(696)	(696)		9,266	$ 9,504
Balance (in shares) at Dec. 31, 2019	37,460	37,460												37,460,052
Increase (Decrease) in Stockholders' Equity
Net income (loss)									(15,748)					$ (15,748)
Share based compensation expense				3,501										3,501
Issuance of common stock upon vesting of restricted stock units		$ 4		(4)
Issuance of common stock upon vesting of restricted stock units (in shares)		354
Effect of shares withheld to cover taxes				(4,146)										(4,146)
Total other comprehensive loss						(8,873)								(8,873)
Balance at Mar. 31, 2020		$ 380		353,677		(21,424)			(347,937)		(696)			(16,000)
Balance (in shares) at Mar. 31, 2020		37,814
Balance (ASU 2016-13) at Dec. 31, 2019							$ (238)					$ (238)
Balance at Dec. 31, 2019	$ 376	$ 376	$ 354,326	354,326	$ (12,551)	(12,551)		$ (332,189)	(331,951)	$ (696)	(696)		$ 9,266	$ 9,504
Balance (in shares) at Dec. 31, 2019	37,460	37,460												37,460,052
Increase (Decrease) in Stockholders' Equity
Net income (loss)														$ 22,121
Total other comprehensive loss														(7,849)
Balance at Sep. 30, 2020		$ 383		363,082		(20,400)			(310,068)		(696)			$ 32,301
Balance (in shares) at Sep. 30, 2020		38,135												38,134,602
Balance at Mar. 31, 2020		$ 380		353,677		(21,424)			(347,937)		(696)			$ (16,000)
Balance (in shares) at Mar. 31, 2020		37,814
Increase (Decrease) in Stockholders' Equity
Net income (loss)									31,054					31,054
Share based compensation expense				8,984										8,984
Issuance in connection with the exercise of stock options				38										38
Issuance in connection with the exercise of stock options (in shares)		3
Issuance of common stock upon vesting of restricted stock units		$ 3		(3)
Issuance of common stock upon vesting of restricted stock units (in shares)		316
Effect of shares withheld to cover taxes				(2,682)										(2,682)
Total other comprehensive loss						(546)								(546)
Balance at Jun. 30, 2020		$ 383		360,014		(21,970)			(316,883)		(696)			20,848
Balance (in shares) at Jun. 30, 2020		38,133
Increase (Decrease) in Stockholders' Equity
Net income (loss)									6,815					6,815
Share based compensation expense				3,081										3,081
Issuance of common stock upon vesting of restricted stock units (in shares)		2
Effect of shares withheld to cover taxes				(13)										(13)
Total other comprehensive loss						1,570								1,570
Balance at Sep. 30, 2020		$ 383		$ 363,082		$ (20,400)			$ (310,068)		$ (696)			$ 32,301
Balance (in shares) at Sep. 30, 2020		38,135												38,134,602