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Table Of Stock-based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | $ 10,347 us-gaap_ShareBasedCompensation | $ 10,262 us-gaap_ShareBasedCompensation | $ 11,802 us-gaap_ShareBasedCompensation
Cost of Sales |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | 282 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 308 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember | 375 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_CostOfSalesMember
Research and Development Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | 6,773 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 6,351 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember | 7,055 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_ResearchAndDevelopmentExpenseMember
Selling and Marketing Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | 1,746 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 2,197 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember | 2,494 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingAndMarketingExpenseMember
General and Administrative Expense |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |
Share-based compensation expense | $ 1,546 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 1,406 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember | $ 1,878 us-gaap_ShareBasedCompensation / us-gaap_IncomeStatementLocationAxis = us-gaap_GeneralAndAdministrativeExpenseMember

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Period Type: | duration

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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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Data Type: | na
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Period Type: |

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Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |