Summary of Deferred Revenue (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Deferred Revenue Arrangement [Line Items]
Undelivered elements (training, installation, and product and support services)	$ 1,661	$ 1,723
Extended warranty contracts	1,524	1,506
Total deferred revenue	3,185	3,229
Less long-term amounts:
Extended warranty contracts	(1)	(3)
Total deferred revenue, long-term	(1)	(3)
Total deferred revenue, current portion	$ 3,184	$ 3,226

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Amount of deferred revenue from sales of extended warranty contracts expected to be earned within one year.

+ References

No definition available.

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Amount of deferred revenue from sales of extended warranty contracts expected to be earned after one year.

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No definition available.

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Amount of deferred revenue from sales of training, installation, product and support services expected to be earned within one year.

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No definition available.

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- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

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-Subparagraph (SAB TOPIC 13.A.4(a).Q1)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section 45

-Paragraph 8

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-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6935-107765

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 13

-Section A

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-Name Accounting Research Bulletin (ARB)

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-Chapter 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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