Balance Sheet (Tables)

6 Months Ended

Jul. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Accounts and Contracts Receivables

	As of July 31, 2019								As of January 31, 2019
	Current			Long-term		Total			Current			Long-term		Total
Accounts receivable	$	12,722		$	90	$	12,812		$	14,195		$	712	$	14,907
Less allowance for doubtful accounts	(2,073		)	—		(2,073		)	(2,113		)	—		(2,113		)
Accounts receivable net of allowance for doubtful accounts	$	10,649		$	90	$	10,739		$	12,082		$	712	$	12,794

Schedule of Inventories

	July 31, 2019			January 31, 2019
	(in thousands)
Inventories:
Raw materials	$	7,060		$	5,446
Finished goods	2,300			5,229
Work in progress	4,857			1,322
	14,217			11,997
Less allowance for obsolescence	(1,102		)	(1,223		)
Total inventories, net	$	13,115		$	10,774

Schedule of Seismic Equipment Lease Pool and Property and Equipment

	July 31, 2019			January 31, 2019
	(in thousands)
Seismic equipment lease pool and property and equipment:
Seismic equipment lease pool	$	143,894		$	147,519
Land and buildings	4,055			4,041
Furniture and fixtures	10,205			9,897
Autos and trucks	570			571
	158,724			162,028
Accumulated depreciation and amortization	(146,883		)	(147,873		)
Total seismic equipment lease pool and property and equipment, net	$	11,841		$	14,155