Condensed Consolidated Balance Sheets (Unaudited) $ in Thousands, € in Millions	Jun. 30, 2016 EUR (€)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Current assets:
Cash and cash equivalents		$ 52,433	$ 84,933	$ 117,060	$ 173,608
Accounts receivable, net		20,094	44,365
Unbilled receivables		22,011	19,937
Inventories		34,377	32,721
Prepaid expenses and other current assets		17,461	14,807
Total current assets		146,376	196,763
Property, plant, equipment and seismic rental equipment, net		58,412	72,027
Multi-client data library, net		118,547	132,237
Goodwill	€ 15.7	24,025	26,274
Intangible assets, net		3,947	4,810
Other assets		2,514	2,977
Total assets		353,821	435,088
Current liabilities:
Current maturities of long-term debt		20,371	7,912
Accounts payable		26,969	29,799
Accrued expenses		27,284	34,287
Accrued multi-client data library royalties		23,473	25,045
Deferred revenue		7,666	6,560
Total current liabilities		105,763	103,603
Long-term debt, net of current maturities		145,130	175,080
Other long-term liabilities		44,051	44,365
Total liabilities		294,944	323,048
Equity:
Common stock, $0.01 par value; authorized 26,666,667 shares; outstanding 11,786,220 and 10,702,689 shares at June 30, 2016 and December 31, 2015, respectively, net of treasury stock		118	107
Additional paid-in capital		897,476	894,715
Accumulated deficit		(819,887)	(759,531)
Accumulated other comprehensive loss		(18,980)	(14,781)
Treasury stock, at cost, zero and 353,124 shares at June 30, 2016 and December 31, 2015 respectively		0	(8,551)
Total stockholders' equity		58,727	111,959
Noncontrolling interest		150	81
Total equity		58,877	112,040
Total liabilities and equity		$ 353,821	$ 435,088