CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net loss	$ (51,301)	$ (28,036)
Adjustments to reconcile net loss to cash (used in) provided by operating activities:
Depreciation and amortization (other than multi-client data library)	6,902	13,199
Amortization of multi-client data library	32,544	34,245
Stock-based compensation expense	2,508	1,694
Accrual for loss contingency related to legal proceedings	0	5,000
Deferred income taxes	(2,310)	(900)
Change in operating assets and liabilities:
Accounts receivable	(4,383)	(18,200)
Unbilled receivables	13,156	(12,398)
Inventories	(646)	831
Accounts payable, accrued expenses and accrued royalties	(9,567)	1,011
Deferred revenue	1,479	7,092
Other assets and liabilities	4,294	6,156
Net cash (used in) provided by operating activities	(7,324)	9,694
Cash flows from investing activities:
Cash invested in multi-client data library	(19,911)	(16,576)
Purchase of property, plant, equipment and seismic rental assets	(510)	(1,021)
Proceeds from sale of fixed assets and rental assets	197	0
Net cash used in investing activities	(20,224)	(17,597)
Cash flows from financing activities:
Payments under revolving line of credit	(10,000)	0
Payments on notes payable and long-term debt	(30,071)	(4,320)
Costs associated with issuance of debt	(565)	0
Net proceeds from issuance of stock	46,999	0
Dividend payment to non-controlling interest	(200)	0
Other financing activities	(924)	(257)
Net cash provided by (used in) financing activities	5,239	(4,577)
Effect of change in foreign currency exchange rates on cash, cash equivalents and restricted cash	296	(271)
Net decrease in cash, cash equivalents and restricted cash	(22,013)	(12,751)
Cash, cash equivalents and restricted cash at beginning of period	52,419	53,433
Cash, cash equivalents and restricted cash at end of period	$ 30,406	$ 40,682