CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-in-Capital	Treasury Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Balance at Dec. 31, 2016	$ 44	$ 228,692	$ (8,216)	$ (7,800)	$ (155,684)	$ 57,036
Balance (in shares) at Dec. 31, 2016	44,203
Increase (Decrease) in Stockholders' Equity
Net income attributable to ISG					(2,130)	(2,130)
Other comprehensive income				2,134		2,134
Equity securities repurchased			(2,853)			(2,853)
Proceeds from issuance of ESPP		(136)	808			672
Issuance of treasury shares		(7,100)	7,100
Accretion of noncontrolling interest		30				30
Issuance of common stock for contingent earn-out		721				721
Issuance of common stock for contingent earn-out (in shares)	287
Purchase of non-controlling interest		488				488
Stock based compensation		7,439				7,439
Balance at Dec. 31, 2017	$ 44	230,134	(3,161)	(5,666)	(157,814)	$ 63,537
Balance (in shares) at Dec. 31, 2017	44,490					44,490
Increase (Decrease) in Stockholders' Equity
Net income attributable to ISG					5,677	$ 5,677
Other comprehensive income				(1,489)		(1,489)
Impact of change in accounting policy					2,039	2,039
Equity securities repurchased			(3,063)			(3,063)
Proceeds from issuance of ESPP		(9)	833			824
Issuance of treasury shares		(5,188)	5,188
Issuance of common stock for contingent earn-out		1,200				1,200
Issuance of common stock for contingent earn-out (in shares)	290
Issuance of common stock	$ 1	(1)
Issuance of common stock (in shares)	697
Stock based compensation		9,862				9,862
Balance at Dec. 31, 2018	$ 45	$ 235,998	$ (203)	$ (7,155)	$ (150,098)	$ 78,587
Balance (in shares) at Dec. 31, 2018	45,477					45,477