CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Beginning balance at Dec. 31, 2018	$ 7,824	$ 140	$ 952,626	$ (926,092)	$ (20,442)	$ 1,592
Beginning balance (in shares) at Dec. 31, 2018		14,015,615
Comprehensive income (loss):
Net (loss) income	(29,535)			(29,982)		447
Translation adjustments	50				30	20
Stock-based compensation expense	2,831		2,831
Exercise of stock options	77	$ 1	76
Exercise of stock options (in shares)		24,500
Vesting of restricted stock units/awards		$ 2	(2)
Vesting of restricted stock units/awards (in shares)		201,631
Vested restricted stock cancelled for employee minimum income taxes	(628)	$ (1)	(627)
Vested restricted stock cancelled for employee minimum income taxes (in shares)		(70,185)
Ending balance at Jun. 30, 2019	(19,381)	$ 142	954,904	(956,074)	(20,412)	2,059
Ending balance (in shares) at Jun. 30, 2019		14,171,561
Beginning balance at Mar. 31, 2019	(11,439)	$ 141	953,679	(947,452)	(19,472)	1,665
Beginning balance (in shares) at Mar. 31, 2019		14,069,520
Comprehensive income (loss):
Net (loss) income	(8,287)			(8,622)		335
Translation adjustments	(881)				(940)	59
Stock-based compensation expense	1,538		1,538
Exercise of stock options	59	$ 1	58
Exercise of stock options (in shares)		18,750
Vesting of restricted stock units/awards		$ 1	(1)
Vesting of restricted stock units/awards (in shares)		133,432
Vested restricted stock cancelled for employee minimum income taxes	(371)	$ (1)	(370)
Vested restricted stock cancelled for employee minimum income taxes (in shares)		(50,141)
Ending balance at Jun. 30, 2019	(19,381)	$ 142	954,904	(956,074)	(20,412)	2,059
Ending balance (in shares) at Jun. 30, 2019		14,171,561
Beginning balance at Dec. 31, 2019	(34,632)	$ 142	956,647	(974,291)	(19,318)	2,188
Beginning balance (in shares) at Dec. 31, 2019		14,224,787
Comprehensive income (loss):
Net (loss) income	(7,507)			(7,482)		(25)
Translation adjustments	(3,070)				(2,515)	(555)
Stock-based compensation expense	1,094		1,094
Exercise of stock options	15		15
Exercise of stock options (in shares)		5,000
Vesting of restricted stock units/awards (in shares)		17,089
Vested restricted stock cancelled for employee minimum income taxes	(10)		(10)
Vested restricted stock cancelled for employee minimum income taxes (in shares)		(1,047)
Ending balance at Jun. 30, 2020	(44,110)	$ 142	957,746	(981,773)	(21,833)	1,608
Ending balance (in shares) at Jun. 30, 2020		14,245,829
Beginning balance at Mar. 31, 2020	(38,603)	$ 142	957,254	(976,554)	(21,099)	1,654
Beginning balance (in shares) at Mar. 31, 2020		14,240,126
Comprehensive income (loss):
Net (loss) income	(5,167)			(5,219)		52
Translation adjustments	(832)				(734)	(98)
Stock-based compensation expense	477		477
Exercise of stock options	15		15
Exercise of stock options (in shares)		5,000
Vesting of restricted stock units/awards (in shares)		1,000
Vested restricted stock cancelled for employee minimum income taxes (in shares)		(297)
Ending balance at Jun. 30, 2020	$ (44,110)	$ 142	$ 957,746	$ (981,773)	$ (21,833)	$ 1,608
Ending balance (in shares) at Jun. 30, 2020		14,245,829