Acquisition of Assets (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
Feb. 28, 2018	Apr. 30, 2019
Preferred Stock
Allocation of purchase price:
Stock issued during period (in shares)	174,046	152,290
Preferred stock dividend rate	9.00%
Value of shares issued	$ 4,000	$ 3,500
Hydroscience
Purchase Price:
Cash	3,000
Release of claims against Hydroscience	1,144
Transaction costs	312
Total purchase price	4,456
Allocation of purchase price:
Inventory	206
Tangible assets (mainly manufacturing equipment)	350
Intangible assets (including patents, designs & software)	3,900
Total purchase price	$ 4,456

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Business Combination, Consideration Transferred, Accounts Receivable Forgiven

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tangible Assets

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Purchase Price [Abstract]

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets acquired at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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The amount of inventory recognized as of the acquisition date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The percentage rate used to calculate dividend payments on preferred stock.

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Number of shares of stock issued during the period pursuant to acquisitions.

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