Concentration risk number of customers.

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- Definition

Number of major customers.

+ References

No definition available.

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- Definition

Number of money market mutual fund invested.

+ References

No definition available.

+ Details

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- Definition

Percentage of tax benefit realized upon settlement.

+ References

No definition available.

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- Definition

Sale of business cash and noncash consideration.

+ References

No definition available.

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- Definition

Summary of significant accounting policies.

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.4)
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-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524

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- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Antidilution
-URI http://asc.fasb.org/extlink&oid=6505113

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Diluted Earnings Per Share
-URI http://asc.fasb.org/extlink&oid=6510752

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Contingent Stock Agreement
-URI http://asc.fasb.org/extlink&oid=6508534

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-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 958
-SubTopic 225
-Section 45
-Paragraph 11
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Impairment
-URI http://asc.fasb.org/extlink&oid=6515133

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-Name Accounting Standards Codification
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- Definition

Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=51661791&loc=d3e1205-110223

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Definition

Amount of undistributed earnings (loss) allocated to participating securities for the basic earnings (loss) per share or per unit calculation under the two-class method.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 45
-Paragraph 60B
-Subparagraph (b)
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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands, shares in Millions		12 Months Ended
	Apr. 30, 2013 USD ($)	Dec. 31, 2015 USD ($) Investment Customer shares	Dec. 31, 2014 USD ($) Investment Customer shares	Dec. 31, 2013 USD ($) Customer shares
Summary Of Significant Accounting Policies [Line Items]
Proceeds from sale of business	$ 54,500
Cash in banks		$ 22,200	$ 32,900
Money market mutual funds		$ 86,900	$ 71,800
Number of money market mutual fund invested \| Investment		3	3
Receivables, allowance		$ 2,365	$ 2,336
Impairment of property and equipment		0	0	$ 0
Undistributed earnings (loss) allocable to participating securities		200	300	200
Share-based expense		$ 5,200	$ 4,300	$ 6,200
Percentage of tax benefit realized upon settlement		50.00%
Number of customers \| Customer		3	3	3
Sales \| Customer Concentration Risk
Summary Of Significant Accounting Policies [Line Items]
Number of customers \| Customer		4	4	4
Concentration risks percentage		77.00%	73.00%	65.00%
Sales \| Customer Concentration Risk \| Customer 1
Summary Of Significant Accounting Policies [Line Items]
Concentration risks percentage		31.00%	35.00%	34.00%
Sales \| Customer Concentration Risk \| Customer 2
Summary Of Significant Accounting Policies [Line Items]
Concentration risks percentage		26.00%	25.00%	20.00%
Sales \| Customer Concentration Risk \| Customer 3
Summary Of Significant Accounting Policies [Line Items]
Concentration risks percentage		14.00%
Accounts Receivable \| Credit Concentration Risk
Summary Of Significant Accounting Policies [Line Items]
Number of customers \| Customer		4	4
Concentration risks percentage		79.00%	77.00%
Accounts Receivable \| Credit Concentration Risk \| Two Major Customers
Summary Of Significant Accounting Policies [Line Items]
Concentration risks percentage		69.00%	62.00%	61.00%
Number of major customers \| Customer		2	2	2
Share-based awards
Summary Of Significant Accounting Policies [Line Items]
Anti-dilutive securities not included in the computation of diluted earnings per share \| shares		0.7	0.6	2.4
Network Equipment And Tools And Test Equipment
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, years		5 years
Computer equipment
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, years		3 years
Computer software
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, years		3 years
Furniture and fixtures
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, years		3 years
Leasehold Improvements
Summary Of Significant Accounting Policies [Line Items]
Estimated useful lives, description		Five years or the life of the lease, whichever is less