Condensed Consolidated Statements of Changes In Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Including Portion Attributable to Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2019	$ 355	$ 371,311	$ (235,474)	$ (2,408)
Vesting of restricted stock	2	(2)
Stock option exercises		158
Stock-based compensation expense		4,726
Net loss			(68,136)
Restricted stock vesting and withholding			(483)
Foreign currency translation adjustment				(6,234)	$ (6,234)
Balance at Sep. 30, 2020	357	376,193	(304,093)	(8,642)	63,815
Balance at Jun. 30, 2020	356	374,461	(292,892)	(10,017)
Vesting of restricted stock	1	(1)
Stock option exercises		0
Stock-based compensation expense		1,733
Net loss			(11,078)
Restricted stock vesting and withholding			(123)
Foreign currency translation adjustment				1,375	1,375
Balance at Sep. 30, 2020	357	376,193	(304,093)	(8,642)	63,815
Balance at Dec. 31, 2020	364	379,917	(321,412)	(5,086)
Vesting of restricted stock	5	(5)
Stock option exercises		0
Stock-based compensation expense		8,574
Net loss			(13,482)
Restricted stock vesting and withholding			(905)
Foreign currency translation adjustment				(1,588)	(1,588)
Balance at Sep. 30, 2021	369	388,486	(335,799)	(6,674)	46,382
Balance at Jun. 30, 2021	367	384,776	(333,853)	(5,062)
Vesting of restricted stock	2	(2)
Stock option exercises		0
Stock-based compensation expense		3,712
Net loss			(1,829)
Restricted stock vesting and withholding			(117)
Foreign currency translation adjustment				(1,612)	(1,612)
Balance at Sep. 30, 2021	$ 369	$ 388,486	$ (335,799)	$ (6,674)	$ 46,382