CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 51,056		$ 33,065	$ 27,894
Accounts receivable, net	8,288		29,548
Unbilled receivables	9,629		11,815
Inventories, net	11,873		12,187
Prepaid expenses and other current assets	5,861		6,012
Total current assets	86,707		92,627
Deferred income tax asset, net	8,092		8,734
Property, plant and equipment, net	11,227		13,188
Multi-client data library, net	53,289		60,384
Goodwill	18,684		23,585			$ 22,915
Right-of-use assets	37,730		32,546
Other assets	2,136		2,130
Total assets	217,865		233,194
Current liabilities:
Current maturities of long-term debt	23,527		2,107
Accounts payable	35,107		49,316
Accrued expenses	29,197		30,328
Accrued multi-client data library royalties	20,534		18,831
Deferred revenue	2,156		4,551
Current maturities of operating lease liabilities	6,727		11,055
Total current liabilities	117,248		116,188
Long-term debt, net of current maturities	119,349		119,352
Operating lease liabilities, net of current maturities	40,380		30,833
Other long-term liabilities	412		1,453
Total liabilities	277,389		267,826
Deficit:
Common stock, $0.01 par value; authorized 26,666,667 shares; outstanding 14,315,453 and 14,224,787 shares at September 30, 2020 and December 31, 2019, respectively.	144		142
Additional paid-in capital	958,189		956,647
Accumulated deficit	(998,380)		(974,291)
Accumulated other comprehensive loss	(21,012)		(19,318)
Total stockholders’ deficit	(61,059)		(36,820)
Noncontrolling interest	1,535		2,188
Total deficit	(59,524)	$ (44,110)	(34,632)	$ (23,106)	$ (19,381)	$ 7,824
Total liabilities and deficit	$ 217,865		$ 233,194