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Industry Segments - Geographic information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting Information [Line Items]                      
Number of Operating Segments | Segment                 1    
Revenue $ 21,942 $ 24,013 $ 23,700 $ 20,595 $ 35,001 $ 23,255 $ 24,340 $ 11,950 $ 90,250 $ 94,546 $ 100,252
Assets (1) [1] 76,141       117,631       76,141 117,631 163,966
United States [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 63,782 75,353 74,592
Assets (1) [1] 61,690       99,339       61,690 99,339 132,264
Canada [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 25,456 17,790 25,660
Assets (1) [1] 13,597       18,028       13,597 18,028 31,586
Mexico [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 1,012 1,403 0
Assets (1) [1] $ 854       $ 264       $ 854 $ 264 $ 116
[1] Assets include net seismic data library and net property and equipment.