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Industry Segments - Geographic information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
Segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting Information [Line Items]                      
Number of Operating Segments | Segment                 1    
Revenue $ 35,001 $ 23,255 $ 24,340 $ 11,950 $ 13,962 $ 31,242 $ 30,722 $ 24,326 $ 94,546 $ 100,252 $ 198,037
Assets (1) [1] 117,631       163,966       117,631 163,966 168,936
United States [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 75,353 74,592 156,722
Assets (1) [1] 99,339       132,264       99,339 132,264 121,424
Canada [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 17,790 25,660 41,315
Assets (1) [1] 18,028       31,586       18,028 31,586 47,512
Mexico [Member]                      
Segment Reporting Information [Line Items]                      
Revenue                 1,403 0 0
Assets (1) [1] $ 264       $ 116       $ 264 $ 116 $ 0
[1] Assets include net seismic data library and net property and equipment.