Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Summary of segment information
Net revenues	$ 16,234	$ 53,239	$ 95,379	$ 131,970
Gross profit (loss)	$ 1,289	$ 25,288	$ 34,217	$ 54,783
Gross margin (percent)	8.00%	47.00%	36.00%	42.00%
Income (loss) from operations	$ (11,164)	$ 3,858	$ (10,310)	$ (14,632)
Interest expense, net	(3,669)	(3,155)	(10,304)	(9,378)
Other income (expense), net	(525)	(242)	6,675	(938)
Income (loss) before income taxes	(15,358)	461	(13,939)	(24,948)
Operating segments | E&P Technology & Services
Summary of segment information
Net revenues	10,093	40,241	71,833	95,867
Gross profit (loss)	$ (1,092)	$ 18,316	$ 24,902	$ 36,113
Gross margin (percent)	(11.00%)	46.00%	35.00%	38.00%
Income (loss) from operations	$ (4,591)	$ 11,878	$ 13,803	$ 15,500
Operating segments | E&P Technology & Services | Total multi-client revenues
Summary of segment information
Net revenues	6,298	33,193	59,423	79,424
Operating segments | E&P Technology & Services | New Venture
Summary of segment information
Net revenues	1,213	5,905	7,340	24,394
Operating segments | E&P Technology & Services | Data Library
Summary of segment information
Net revenues	5,085	27,288	52,083	55,030
Operating segments | E&P Technology & Services | Imaging and Reservoir Services
Summary of segment information
Net revenues	3,795	7,048	12,410	16,443
Operating segments | E&P Operations Optimization
Summary of segment information
Net revenues	6,141	12,998	23,546	36,103
Gross profit (loss)	$ 2,381	$ 6,972	$ 9,315	$ 18,670
Gross margin (percent)	39.00%	54.00%	40.00%	52.00%
Income (loss) from operations	$ (232)	$ 2,994	$ (3,965)	$ 5,808
Operating segments | E&P Operations Optimization | Optimization Software & Services
Summary of segment information
Net revenues	3,007	6,895	10,811	17,648
Operating segments | E&P Operations Optimization | Devices
Summary of segment information
Net revenues	3,134	6,103	12,735	18,455
Support and other
Summary of segment information
Income (loss) from operations	$ (6,341)	$ (11,014)	$ (20,148)	$ (35,940)