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Business Combination - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 16, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | 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 |  | $ 3,120 |  | $ 354
ICAR Vision Systems, S.L. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquisition, net of cash acquired | $ 3,000 |  |  |
Shares issued as consideration for acquisition | 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 recognized in acquisition-related costs and expenses |  | $ 300 |  |
Cash payment into an escrow fund to serve as collateral and partial security for working capital adjustments and certain indemnification rights | $ 1,500 |  |  |
Business acquisitions expenses | 400 |  |  |
ICAR Vision Systems, S.L. | Q4 Consideration |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration | 1,500 |  |  |
ICAR Vision Systems, S.L. | Earnout Consideration |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Contingent consideration | $ 3,800 |  |  |

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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3213-108585 + Details
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