CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 33,065	$ 33,551	$ 52,056
Accounts receivable, net	29,548	26,128
Unbilled receivables	11,815	44,032
Inventories, net	12,187	14,130
Prepaid expenses and other current assets	6,012	7,782
Total current assets	92,627	125,623
Deferred income tax asset	8,734	7,191
Property, plant and equipment, net	13,188
Property, plant and equipment, net		13,041
Multi-client data library, net	60,384	73,544
Goodwill	23,585	22,915	24,089
Right-of-use assets	32,546	47,803
Other assets	2,130	2,435
Total assets	233,194	292,552
Current liabilities:
Current maturities of long-term debt	2,107	2,228
Accounts payable	49,316	34,913
Accrued expenses	30,328	31,411
Accrued multi-client data library royalties	18,831	29,256
Deferred revenue	4,551	7,710
Current maturities of operating lease liabilities	11,055	12,214
Total current liabilities	116,188	117,732
Long-term debt, net of current maturities	119,352	119,513
Operating lease liabilities, net of current maturities	30,833	45,592
Other long-term liabilities	1,453	1,891
Total liabilities	267,826	284,728
(Deficit) Equity:
Common stock, $0.01 par value; authorized 26,666,667 shares; outstanding 14,224,787 and 14,015,615 shares at December 31, 2019 and 2018, respectively.	142	140
Additional paid-in capital	956,647	952,626
Accumulated deficit	(974,291)	(926,092)
Accumulated other comprehensive loss	(19,318)	(20,442)
Total stockholders’ (deficit) equity	(36,820)	6,232
Noncontrolling interests	2,188	1,592
Total (deficit) equity	(34,632)	7,824	$ 30,806	$ 53,398
Total liabilities and (deficit) equity	$ 233,194	$ 292,552