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Business Combination - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands		6 Months Ended
	Oct. 16, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Sep. 30, 2017
Business Acquisition [Line Items]
Acquisition, net of cash acquired		$ 2,991	$ 0
Common stock, par value (in dollars per share)		$ 0.001			$ 0.001
Acquisition-related contingent consideration		$ 3,703			$ 354
ICAR Vision Systems, S.L.
Business Acquisition [Line Items]
Acquisition, net of cash acquired	$ 3,000
Stock issued as consideration	584,291
Common stock issued during acquisition, value	$ 5,600
Common stock, par value (in dollars per share)	$ 0.001
Acquisition-related contingent consideration				$ 2,900
Contingent consideration, change in amount of contingent consideration liability		$ 700
Business acquisition, transaction costs	$ 500
Escrow deposit	1,500
ICAR Vision Systems, S.L. | Contingent Consideration, Fourth Quarter Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high	1,500
ICAR Vision Systems, S.L. | Contingent Consideration, Earnout Consideration
Business Acquisition [Line Items]
Contingent consideration arrangement, range of outcomes, high	$ 3,800

X

- Definition

Amount of direct costs of the business combination including legal, accounting, and other costs incurred to consummate the business acquisition.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
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- Definition

Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

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- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Face amount or stated value per share of common stock.

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The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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