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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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- Definition

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

Amount after tax, before reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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Basis of Presentation - Additional Information (Detail)		3 Months Ended
Basis of Presentation - Additional Information (Detail)	Jul. 31, 2017 USD ($)	Mar. 31, 2018 USD ($) Segment	Mar. 31, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Nature Of Operations [Line Items]
Number of operating segments \| Segment		2
Net foreign exchange losses resulting from foreign currency transactions included in other income		$ 69,000	$ 12,000
Adjustment to retained earnings				$ 100,000	$ 92,000
Retained Earnings [Member]
Nature Of Operations [Line Items]
Adjustment to retained earnings					$ 92,000
Retained Earnings [Member] \| ASU 2014-09 [Member] \| Adoption of Topic 606 [Member]
Nature Of Operations [Line Items]
Changes to retained earnings		$ 0
Engineering Services [Member]
Nature Of Operations [Line Items]
Proceeds from sale of business	$ 1,450,000