Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests
Beginning balance, Shares at Dec. 31, 2013			10,915,851
Beginning balance at Dec. 31, 2013		$ 257,885	$ 109	$ 881,497	$ (606,157)	$ (11,138)	$ (6,565)	$ 139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	[1]	(128,234)			(128,252)			18
Translation adjustment		(940)				(882)		(58)
Change in fair value of effective cash flow hedges (net of taxes)		26				26
Equity interest in INOVA Geophysical's other comprehensive income (loss)		(841)				(841)
Unrealized net gain (loss) on available-for-sale securities		28				28
Stock-based compensation expense		$ 8,707		8,707
Exercise of stock options, Shares		1,900	1,900
Exercise of stock options		$ 95	$ 0	95
Vesting of restricted stock units/ awards, Shares			44,162
Vesting of restricted stock units/awards		0	$ 1	(1)
Restricted stock cancelled for employee minimum income taxes, Shares			(9,075)
Restricted stock cancelled for employee minimum income taxes		(350)	$ 0	(350)
Issuance of stock for the ESPP, Shares			12,768
Issuance of stock for the ESPP		482	$ 0	482
Ending balance, Shares at Dec. 31, 2014			10,965,606.000
Ending balance at Dec. 31, 2014		135,712	$ 110	889,284	(734,409)	(12,807)	(6,565)	99
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net		(1,146)		(1,146)
Net income (loss)	[1]	(25,118)			(25,122)			4
Translation adjustment		(1,996)				(1,974)		(22)
Unrealized net gain (loss) on available-for-sale securities		0
Stock-based compensation expense		$ 5,486		5,486
Exercise of stock options, Shares		0
Vesting of restricted stock units/ awards, Shares			29,191
Vesting of restricted stock units/awards		$ 0	$ 0	0
Purchase of treasury shares, Shares			(296,488)
Purchase of treasury shares		(1,989)	$ (3)				(1,986)
Restricted stock cancelled for employee minimum income taxes, Shares			(6,208)
Restricted stock cancelled for employee minimum income taxes		(126)	$ 0	(126)
Issuance of stock for the ESPP, Shares			10,588
Issuance of stock for the ESPP		215	$ 0	215
Purchase of subsidiary shares from noncontrolling interest		(144)		(144)
Ending balance, Shares at Dec. 31, 2015			10,702,689.000
Ending balance at Dec. 31, 2015		112,040	$ 107	894,715	(759,531)	(14,781)	(8,551)	81
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)		(64,727)			(65,148)			421
Translation adjustment		(6,960)				(6,967)		7
Unrealized net gain (loss) on available-for-sale securities		0
Stock-based compensation expense		$ 3,267		3,267
Exercise of stock options, Shares		0
Vesting of restricted stock units/ awards, Shares			40,495
Vesting of restricted stock units/awards		$ 0	$ 0	0
Purchase of treasury shares, Shares			(155,304)
Purchase of treasury shares		(964)	$ (1)				(963)
Restricted stock cancelled for employee minimum income taxes, Shares			(4,973)
Restricted stock cancelled for employee minimum income taxes		(22)	$ 0	(22)
Issuance of stock for the ESPP, Shares			4,100
Issuance of stock for the ESPP		23	$ 0	23
Issuance of stock in bond exchange, Shares			1,205,440
Issuance of stock in bond exchange		10,741	$ 12	1,215			9,514
Ending balance, Shares at Dec. 31, 2016			11,792,447.000
Ending balance at Dec. 31, 2016		$ 53,398	$ 118	$ 899,198	$ (824,679)	$ (21,748)	$ 0	$ 509

[1] Net income attributable to noncontrolling interests for 2015 and 2014 excludes less than $(0.1) million and $0.7 million, respectively, related to the redeemable noncontrolling interests, which is reported in the mezzanine equity section of the Consolidated Balance Sheet.