Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Summary of segment information
Net revenues	$ 22,731	$ 41,775	$ 79,145	$ 78,731
Gross profit (loss)	$ 4,584	$ 19,583	$ 32,928	$ 29,495
Gross margin (percent)	20.00%	47.00%	42.00%	37.00%
Income (loss) from operations	$ (5,472)	$ (2,553)	$ 854	$ (18,490)
Interest expense, net	(3,414)	(3,111)	(6,635)	(6,223)
Other income (expense), net	6,771	96	7,200	(696)
Income (loss) before income taxes	(2,115)	(5,568)	1,419	(25,409)
Operating segments | E&P Technology & Services
Summary of segment information
Net revenues	15,226	28,523	61,740	55,626
Gross profit (loss)	$ 2,264	$ 12,357	$ 25,994	$ 17,797
Gross margin (percent)	15.00%	43.00%	42.00%	32.00%
Income (loss) from operations	$ 442	$ 5,237	$ 18,394	$ 3,622
Operating segments | E&P Technology & Services | Total multi-client revenues
Summary of segment information
Net revenues	11,553	22,812	53,125	46,231
Operating segments | E&P Technology & Services | New Venture
Summary of segment information
Net revenues	4,686	5,018	6,127	18,489
Operating segments | E&P Technology & Services | Data Library
Summary of segment information
Net revenues	6,867	17,794	46,998	27,742
Operating segments | E&P Technology & Services | Imaging and Reservoir Services
Summary of segment information
Net revenues	3,673	5,711	8,615	9,395
Operating segments | E&P Operations Optimization
Summary of segment information
Net revenues	7,505	13,252	17,405	23,105
Gross profit (loss)	$ 2,320	$ 7,226	$ 6,934	$ 11,698
Gross margin (percent)	31.00%	55.00%	40.00%	51.00%
Income (loss) from operations	$ (474)	$ 2,644	$ (3,733)	$ 2,814
Operating segments | E&P Operations Optimization | Optimization Software & Services
Summary of segment information
Net revenues	3,377	5,720	7,804	10,753
Operating segments | E&P Operations Optimization | Devices
Summary of segment information
Net revenues	4,128	7,532	9,601	12,352
Support and other
Summary of segment information
Income (loss) from operations	$ (5,440)	$ (10,434)	$ (13,807)	$ (24,926)