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Acquisition of Rivierawaves - Additional Information (Detail) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2015 | Jul. 04, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Business Acquisition [Line Items] |  |  |  |
Estimated contingent consideration |  |  |  | $ 3,603
RivieraWaves |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of voting interests acquired |  | 100.00% |  |
Cost of acquired entity, purchase price |  | $ 18,378 |  |
Cost of acquired entity cash paid at closing |  | 14,678 |  |
Business acquisition, description of contingent consideration arrangements |  |  | The remaining amount of $3,700 payable upon the satisfaction of certain milestones (the "Contingent Consideration"). |
Business acquisition, contingent consideration liability |  | 3,700 |  |
Estimated contingent consideration |  |  |  | $ 3,603
Contingent consideration paid |  |  | $ 3,700 |
Business acquisition, acquisition-related costs |  | 310 |  |
Business acquisition, description of acquired entity |  |  | In addition, as part of the acquisition, the Company established an employee retention plan for the RivieraWaves employees at a cost of approximately $3,400, to be payable on a semiannual basis for a period of two years after the Closing Date. |
Employee retention plan cost |  | $ 3,400 |  |
Payment for employee retention | $ 971 |  |  |
Employee retention plan payment period |  | 2 years |  |

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- Definition With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information. + 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 (a) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + 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 (c) -URI http://asc.fasb.org/extlink&oid=56956515&loc=d3e1392-128463 + Details
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