Segment Information and Major Customers - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012 Customer Segment	Dec. 31, 2011 Customer	Dec. 31, 2010 Customer
Segment Reporting Information [Line Items]
Number of operating reportable segments	2
Inter-segment revenues	$ 0
Number of product categories	3
Threshold percentage of revenue generated by major customers	10.00%	10.00%	10.00%
Number of other customers who accounted for more than threshold percentage of revenue	1	0	0
Percentage of sales to service provider	41.00%	44.00%	49.00%
Long-lived assets	80,200,000	75,300,000
Company One [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	23.00%
Company Three [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	0.00%	10.00%	20.00%
Company Two [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage	0.00%	25.00%	18.00%
Company Four [Member]
Segment Reporting Information [Line Items]
Concentration risk, percentage			11.00%
US [Member]
Segment Reporting Information [Line Items]
Long-lived assets	73,900,000	73,900,000
Outside US [Member]
Segment Reporting Information [Line Items]
Long-lived assets	$ 6,300,000	$ 1,400,000

Number of operating reportable segments.

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- Definition

Number of other customers accounted for more than threshold percentage of revenue.

+ References

No definition available.

+ Details

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- Definition

Number of product categories.

+ References

No definition available.

+ Details

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- Definition

Percentage Of Sales To Major Customers

+ References

No definition available.

+ Details

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- Definition

Threshold percentage of revenue generated by major customers.

+ References

No definition available.

+ Details

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- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

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- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 38

-Subparagraph b(1)

-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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- Definition

Amount of revenue from transactions with other operating segments of the same entity.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph b

-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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