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Etratech Acquisition - Additional Information (Detail) - USD ($) $ in Thousands |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Nov. 01, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 68,845 | $ 68,845 | $ 69,685
Etratech Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Product revenues |  | 15,201 | 30,389 |
Net income |  | 678 | 426 |
Net assets acquired | $ 65,009 |  |  |
Cash acquired on acquisition | 670 |  |  |
Gross contractual amount due of accounts receivable | 12,654 |  |  |
Goodwill | 14,881 |  |  |
Goodwill not deductible for income taxes | 8,651 |  |  |
Intangible assets before foreign currency adjustment | $ 33,362 |  |  |
Fluctuations in foreign currency exchange rates that reduced intangible assets value |  |  | 1,027 |
Amortization of intangibles |  | $ 889 | $ 1,847 |

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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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