CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net loss	$ (32,864)	$ (51,301)
Adjustments to reconcile net loss to cash provided by (used in) operating activities:
Depreciation and amortization (other than multi-client data library)	2,903	6,902
Amortization of multi-client data library	29,787	32,544
Stock-based compensation expense	3,736	2,508
Deferred income taxes	(1,248)	(2,310)
Changes in operating assets and liabilities:
Accounts receivable	2,115	(4,383)
Unbilled receivables	12,772	13,156
Inventories	729	(646)
Accounts payable, accrued expenses and accrued royalties	1,528	(9,567)
Deferred revenue	(2,398)	1,479
Other assets and liabilities	2,244	4,294
Net cash provided by (used in) operating activities	19,304	(7,324)
Cash flows from investing activities:
Investment in multi-client data library	(21,225)	(19,911)
Purchase of property, plant and equipment	(1,272)	(313)
Net cash used in investing activities	(22,497)	(20,224)
Cash flows from financing activities:
Payments under revolving line of credit	(15,000)	(10,000)
Borrowings under revolving line of credit	15,000	0
Payments on notes payable and long-term debt	(1,960)	(30,071)
Net proceeds from issuance of stock	0	46,999
Dividend payment to noncontrolling interest	0	(200)
Other financing activities	(655)	(1,489)
Net cash (used in) provided by financing activities	(2,615)	5,239
Effect of change in foreign currency exchange rates on cash, cash equivalents and restricted cash	151	296
Net decrease in cash, cash equivalents and restricted cash	(5,657)	(22,013)
Cash, cash equivalents and restricted cash at beginning of period	33,854	52,419
Cash, cash equivalents and restricted cash at end of period	$ 28,197	$ 30,406