Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 34,228	$ 37,486
Accounts receivable, net	8,457	8,045
Unbilled receivables	4,085	11,262
Inventories, net	11,031	11,267
Prepaid expenses and other current assets	7,387	7,116
Total current assets	65,188	75,176
Deferred income tax asset, net	7,743	0
Property, plant and equipment, net	9,063	9,511
Multi-client data library, net	50,300	50,914
Goodwill	19,773	19,565
Right-of-use assets	33,330	35,501
Other assets	4,250	2,926
Total assets	189,647	193,593
Current liabilities:
Current maturities of long-term debt	29,233	143,731
Accounts payable	28,242	33,418
Accrued expenses	17,737	16,363
Accrued multi-client data library royalties	20,677	21,359
Deferred revenue	4,454	3,648
Current maturities of operating lease liabilities	8,408	7,570
Total current liabilities	108,751	226,089
Long-term debt, net of current maturities	112,737	0
Operating lease liabilities, net of current maturities	36,318	38,372
Other long-term liabilities	212	222
Total liabilities	258,018	264,683
Deficit:
Common stock, $0.01 par value; authorized 26,666,667 shares; outstanding 17,344,187 and 14,333,101 shares at March 31, 2021 and December 31, 2020, respectively.	173	143
Additional paid-in capital	968,633	958,584
Accumulated deficit	(1,018,679)	(1,011,516)
Accumulated other comprehensive loss	(19,575)	(19,913)
Total stockholders’ deficit	(69,448)	(72,702)
Noncontrolling interests	1,077	1,612
Total deficit	(68,371)	(71,090)
Total liabilities and stockholders' deficit	$ 189,647	$ 193,593