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Exit and Disposal Activities	3 Months Ended
Exit and Disposal Activities	Dec. 31, 2017
Restructuring And Related Activities [Abstract]
Exit and Disposal Activities	14. Exit and Disposal Activities In December 2017, the Company initiated a program to reduce operating costs in light of expected and continuing low levels of seismic product demand. The program is expected to produce approximately $6 million of annualized cash savings. The majority of the cost reductions were realized through a reduction of over 60 employees from the Company’s Houston area workforce. In connection with the workforce reductions, the Company incurred $0.7 million of termination costs in its first quarter of fiscal year 2018. The termination costs were recorded to both cost of revenue and operating expenses in the consolidated statement of operations. No further termination costs are expected and there are no outstanding liabilities related to this program as of December 31, 2017.