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Purchase Price at the Date of Acquisition (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jun. 30, 2017	Mar. 31, 2018
Business Acquisition [Line Items]
Working capital adjustment		$ 200
Integrated Photonics, Inc
Business Acquisition [Line Items]
Net cash paid at acquisition	$ 40,098
Working capital adjustment	848
Fair value of cash earnout arrangement	2,215
Purchase price	$ 43,161

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Potential earn-out payments.

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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.

+ 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

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-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
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