Revenue from Contracts with Customers - Revenue Disaggregation (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2020	Jan. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 29,572	$ 25,768
Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	28,839	24,992
Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	733	776
Seamap | Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	21,270	15,213
Seamap | Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	733	776
Klein | Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	7,468	6,515
Klein | Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	0	0
SAP | Revenue recognized at a point in time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	101	3,264
SAP | Revenue recognized over time
Disaggregation of Revenue [Line Items]
Total revenue from contracts with customers	$ 0	$ 0