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Summary of Activity Related to ESPP (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 [Line Items] |  |  |
Balance at beginning of period | $ 3 us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount | $ 3 us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount | $ 8 us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount
Employee purchases | 494 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 518 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan | 474 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Cost of common stock issued | (494)us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | (518)us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | (479)us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Balance at End of Period | $ 3 us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount | $ 3 us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount | $ 3 us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount

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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition An entity will typically disclose the amount of any repurchase obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate change in value for stock issued during the period as a result of employee stock purchase plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration