CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 62,540		$ 33,065	$ 29,563
Accounts receivable, net	10,577		29,548
Unbilled receivables	12,937		11,815
Inventories, net	11,862		12,187
Prepaid expenses and other current assets	4,462		6,012
Total current assets	102,378		92,627
Deferred income tax asset, net	7,987		8,734
Property, plant and equipment, net	11,920		13,188
Multi-client data library, net	51,935		60,384
Goodwill	18,029		23,585			$ 22,915
Right-of-use assets	40,467		32,546
Other assets	3,513		2,130
Total assets	236,229		233,194
Current liabilities:
Current maturities of long-term debt	23,685		2,107
Accounts payable	37,254		49,316
Accrued expenses	25,606		30,328
Accrued multi-client data library royalties	21,316		18,831
Deferred revenue	4,058		4,551
Current maturities of operating lease liabilities	8,355		11,055
Total current liabilities	120,274		116,188
Long-term debt, net of current maturities	119,234		119,352
Operating lease liabilities, net of current maturities	40,409		30,833
Other long-term liabilities	422		1,453
Total liabilities	280,339		267,826
Deficit:
Common stock, $0.01 par value; authorized 26,666,667 shares; outstanding 14,245,829 and 14,224,787 shares at June 30, 2020 and December 31, 2019, respectively.	142		142
Additional paid-in capital	957,746		956,647
Accumulated deficit	(981,773)		(974,291)
Accumulated other comprehensive loss	(21,833)		(19,318)
Total stockholders’ deficit	(45,718)		(36,820)
Noncontrolling interest	1,608		2,188
Total deficit	(44,110)	$ (38,603)	(34,632)	$ (19,381)	$ (11,439)	$ 7,824
Total liabilities and deficit	$ 236,229		$ 233,194