XML 87 R135.htm IDEA: XBRL DOCUMENT v2.4.1.9

Summary of Activity Related to ESPP (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	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	$ 3us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount	$ 3us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount	$ 8us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount
Employee purchases	494us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	518us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	474us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Cost of common stock issued	(494)us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense	(518)us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense	(479)us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Balance at End of Period	$ 3us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount	$ 3us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount	$ 3us-gaap_EmployeeStockOwnershipPlanESOPRepurchaseObligationAmount

X

- 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

X

- 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

X

- Details

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

X

- 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

Name:	us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration