Ixia (XXIA) 10-Q/A 23 Jun 14 2013 Q1 Quarterly report (amended) Financial data

Document_And_Entity_Informatio

Document And Entity Information	3 Months Ended
	Mar. 31, 2013	Apr. 24, 2013
Document and Entity Information [Abstract]	'	'
Entity Registrant Name	'Ixia	'
Document Type	'10-Q	'
Current Fiscal Year End Date	'--12-31	'
Entity Common Stock, Shares Outstanding	'	75,270,635
Amendment Flag	'true	'
Amendment Description	'As used in this Amendment No. 2 on Form 10-Q/A for the quarter ended March 31, 2013 (the "Form 10-Q/A"), the terms "Company," "our," "us" or "we" refer to Ixia, a California corporation. This Form 10-Q/A amends the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, as originally filed with the Securities and Exchange Commission (the "SEC") on May 10, 2013 (the "Original Filing"), as well as Amendment No. 1 on Form 10-Q/A to the Original Filing, as filed with the SEC on August 9, 2013 ("Amendment No. 1"). This Form 10-Q/A is being filed to restate our unaudited condensed consolidated financial statements for the quarter ended March 31, 2013 and to make related revisions to certain other disclosures in the Original Filing and in Amendment No. 1. The restatement of our financial statements in this Form 10-Q/A reflects the correction of certain identified errors related to revenue that affected the timing of the Company's recognition of revenue for transactions that impacted the first quarter of 2013. The errors relate to (i) our inappropriate assessment of certain multiple-element arrangement sales transactions and (ii) an arrangement involving the extension of payment terms beyond our customary terms. The restatement also reflects the correction of errors related to the income tax effects of such revenue errors as well as the correction of certain other tax items in the quarter ended March 31, 2013. Further explanation regarding the restatement is set forth in Note 13 to the unaudited condensed consolidated financial statements included in this Form 10-Q/A. The following sections in the Original Filing (and in Amendment No. 1 in the case of Part I - Item 4) are revised in this Form 10-Q/A to reflect the restatement: Part I - Item 1 - Financial Statements (Unaudited)Part 1 - Item 2 - Management's Discussion and Analysis of Financial Condition and Results of OperationsPart I - Item 4 - Controls and Procedures Part II - Item 1A - Risk FactorsPart II - Item 6 - Exhibits Our principal executive officer and principal financial officer have also provided new certifications as required by Sections 302 and 906 of the Sarbanes-Oxley Act of 2002. The certifications are included in this Form 10-Q/A as Exhibits 31.1, 31.2 and 32.1. For the convenience of the reader, this Form 10-Q/A sets forth the information in the Original Filing in its entirety, as such information, as well as the information in Amendment No. 1, are modified and superseded where necessary to reflect the restatement and related revisions. Except as provided above, this Amendment No. 2 does not reflect events occurring after the filing of the Original Filing and does not amend or otherwise update any information in the Original Filing. Accordingly, this Form 10-Q/A should be read in conjunction with our filings with the SEC subsequent to the date on which we filed the Original Filing with the SEC (i.e., May 10, 2013).	'
Entity Central Index Key	'0001120295	'
Entity Current Reporting Status	'No	'
Entity Voluntary Filers	'No	'
Entity Filer Category	'Accelerated Filer	'
Entity Well-known Seasoned Issuer	'No	'
Document Period End Date	31-Mar-13	'
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q1	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$65,337	$47,508
Short-term investments in marketable securities	139,753	126,851
Accounts receivable, net	99,853	103,523
Inventories	36,305	37,220
Prepaid expenses and other current assets	46,357	42,942
Total current assets	387,605	358,044
Investments in marketable securities	3,167	3,119
Property and equipment, net	29,205	28,763
Intangible assets, net	147,099	157,003
Goodwill	260,457	260,457
Other assets	13,623	11,863
Total assets	841,156	819,249
Current liabilities:	'	'
Accounts payable	12,445	12,114
Accrued expenses and other	44,208	52,525
Deferred revenues	66,603	66,096
Total current liabilities	123,256	130,735
Deferred revenues	10,602	8,695
Other liabilities	36,984	32,321
Convertible senior notes	200,000	200,000
Total liabilities	370,842	371,751
Shareholders’ equity:	'	'
Common stock, without par value; 200,000 shares authorized at March 31, 2013 and December 31, 2012; 75,219 and 74,126 shares issued and outstanding as of March 31, 2013 and December 31, 2012, respectively	166,728	158,933
Additional paid-in capital	176,360	168,980
Retained earnings	125,116	117,296
Accumulated other comprehensive income	2,110	2,289
Total shareholders’ equity	470,314	447,498
Total liabilities and shareholders’ equity	$841,156	$819,249

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $)	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	75,219	74,126
Common stock, shares outstanding	75,219	74,126
Common stock, without par value (in Dollars per share)	'	'

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
Share data in Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013		Mar. 31, 2012
Revenues:	'		'
Products	$95,511,000		$69,607,000
Services	25,948,000		17,051,000
Total revenues	121,459,000		86,658,000
Costs and operating expenses:(1)	'		'
Cost of revenues - products (2)	21,387,000	[1]	14,782,000	[1]
Cost of revenues - services	3,025,000		2,130,000
Research and development	29,712,000		20,851,000
Sales and marketing	35,041,000		24,607,000
General and administrative	12,058,000		11,516,000
Amortization of intangible assets	10,138,000		4,045,000
Acquisition and other related	1,272,000		425,000
Restructuring	58,000		'
Total costs and operating expenses	112,691,000		78,356,000
Income from operations	8,768,000		8,302,000
Interest income and other, net	207,000		110,000
Interest expense	-1,943,000		-1,800,000
Income before income taxes	7,032,000		6,612,000
Income tax expense (benefit)	-788,000		1,445,000
Net income	7,820,000		5,167,000
Earnings per share:	'		'
Basic (in Dollars per share)	$0.10		$0.07
Diluted (in Dollars per share)	$0.10		$0.07
Weighted average number of common and common equivalent shares outstanding:	'		'
Basic (in Shares)	74,718		70,580
Diluted (in Shares)	76,919		72,954
Cost of Revenues - Products [Member]	'		'
Costs and operating expenses:(1)	'		'
Amortization of intangible assets	$6,500,000		$2,700,000
[1]	Cost of revenues - products excludes amortization of intangible assets, related to product lines and purchased technologies of $6.5 million and $2.7 million for the three months ended March 31, 2013 and 2012, respectively, which is included in Amortization of intangible assets.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Operations (Unaudited) (Parentheticals) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Amortization of intangible assets	$10,138	$4,045
Cost of Revenues - Products [Member]	'	'
Stock-based compensation	153	96
Amortization of intangible assets	6,500	2,700
Cost of Revenues - Services [Member]	'	'
Stock-based compensation	58	37
Research and Development Expense [Member]	'	'
Stock-based compensation	2,448	1,279
Selling and Marketing Expense [Member]	'	'
Stock-based compensation	2,015	1,023
General and Administrative Expense [Member]	'	'
Stock-based compensation	$2,205	$1,666

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Net income	$7,820	$5,167
Other comprehensive income, net of tax:	'	'
Change in unrealized gains and losses on investments	144	1,084
Cumulative translation adjustment	-323	-297
Total other comprehensive income (loss), net of tax	-179	787
Comprehensive income	$7,641	$5,954

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:	'	'
Net income	$7,820	$5,167
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation	3,794	3,700
Amortization of intangible assets	10,138	4,045
Stock-based compensation	6,880	4,101
Deferred income taxes	-1,813	-317
Tax benefit from stock options transactions	500	657
Excess tax benefits from stock-based compensation	-555	-597
Changes in operating assets and liabilities, net of effect of acquisitions:	'	'
Accounts receivable, net	3,670	2,000
Inventories	915	443
Prepaid expenses and other current assets	-3,954	60
Other assets	1,739	101
Accounts payable	331	4,943
Accrued expenses and other	-8,324	4,619
Deferred revenues	2,414	4,881
Other liabilities	3,031	54
Net cash provided by operating activities	26,586	33,857
Cash flows from investing activities:	'	'
Purchases of property and equipment	-4,559	-4,754
Purchases of available-for-sale securities	-40,216	-81,173
Proceeds from available-for-sale securities	27,501	52,417
Purchases of other intangible assets	-234	-206
Payments in connection with acquisitions, net of cash acquired	401	'
Net cash used in investing activities	-17,107	-33,716
Cash flows from financing activities:	'	'
Proceeds from exercise of stock options	7,795	5,947
Excess tax benefits from stock-based compensation	555	597
Net cash provided by financing activities	8,350	6,544
Net increase in cash and cash equivalents	17,829	6,685
Cash and cash equivalents at beginning of period	47,508	42,729
Cash and cash equivalents at end of period	$65,337	$49,414

Note_1_Business

Note 1 - Business	3 Months Ended
	Mar. 31, 2013
Disclosure Text Block [Abstract]	'
Nature of Operations [Text Block]	'
	1.           Business
	Ixia was incorporated on May 27, 1997 as a California corporation. We are a leading provider of converged Internet Protocol (IP) network test and network visibility solutions. Equipment manufacturers, service providers, enterprises, and government agencies use our solutions to design, verify, and monitor a broad range of Ethernet, Wi-Fi, 3G and 4G/LTE equipment and networks. Our product solutions consist of our hardware platforms, such as our chassis, interface cards and appliances, software application tools, and services, including our warranty and maintenance offerings and professional services. We operated within one business segment during the periods presented in the accompanying condensed consolidated financial statements.

Note_2_Basis_of_Presentation_a

Note 2 - Basis of Presentation and Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2013
Disclosure Text Block [Abstract]	'
Basis of Presentation and Significant Accounting Policies [Text Block]	'
	2.           Basis of Presentation and Recent Accounting Pronouncements
	Basis of Presentation
	The accompanying condensed consolidated financial statements as of March 31, 2013 and for the three months ended March 31, 2013 and 2012, are unaudited and reflect all adjustments (consisting only of normal recurring adjustments) which are, in the opinion of management, necessary for a fair statement of our financial position, operating results, and cash flows for the interim periods presented. The results of operations for the current interim period presented is not necessarily indicative of results to be expected for the full year ending December 31, 2013 or any other future period.
	These condensed consolidated financial statements have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission. Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) have been condensed or omitted pursuant to such rules and regulations. The condensed consolidated balance sheet as of December 31, 2012 has been derived from our audited consolidated financial statements included in the Annual Report on Form 10-K for the year ended December 31, 2012, but does not include all disclosures required by U.S. GAAP. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2012 (the “2012 Form 10-K”).
	Reclassifications
	Certain reclassifications have been made to prior period consolidated financial statements to conform to the current presentation. Income taxes payable is now presented within Accrued expenses and other on our consolidated balance sheets and consolidated statements of cash flows.
	Recent Accounting Pronouncements
	In June 2011, the FASB issued disclosure guidance related to the presentation of the Statement of Comprehensive Income. This guidance eliminated the then current option to report other comprehensive income and its components in the statement of changes in equity. Under this guidance, we are required to present either a single continuous statement of comprehensive income or a consolidated statement of operations immediately followed by a statement of comprehensive income. Although this guidance changes the presentation of comprehensive income, there are no changes to the components that are recognized in net income or other comprehensive income under the previous guidance. We adopted this guidance in the first quarter of 2012 on a retrospective basis. There was no impact to our consolidated financial results as the adoption of this guidance related only to changes in financial statement presentation. In February 2013, FASB issued finalized disclosure guidance related to the amounts reclassified from accumulated other comprehensive income. Under this guidance, we are required to show reclassifications from accumulated other comprehensive income either in a single note or parenthetically on the face of the statement of operations provided that all of the required information is presented in a single location with the effect of significant amounts reclassified by component and the financial statement line items affected by the reclassification. The effective date for this disclosure guidance is for fiscal years beginning after December 15, 2012. We adopted this new guidance prospectively in the quarter ended March 31, 2013. The adoption of this new guidance did not have a material impact on our consolidated financial position, results of operations and cash flows.

Note_3_Acquisitions

Note 3 - Acquisitions	3 Months Ended
	Mar. 31, 2013
Business Combinations [Abstract]	'
Business Combination Disclosure [Text Block]	'
	3.           Acquisitions
	Anue Systems, Inc.
	On June 1, 2012, we completed our acquisition of all of the outstanding shares of capital stock and all other equity interests of Anue Systems, Inc. (“Anue”). Anue provides solutions to monitor and test complex networks, including Anue’s Net Tool Optimizer solution that efficiently aggregates and filters network traffic to help optimize network monitoring tool usage. With this acquisition, we have expanded our addressable market, broadened our product portfolio and grown our customer base. In addition, we expect to leverage Anue’s existing sales channels and assembled workforce, including its experienced development team. These factors, among others, contributed to a purchase price in excess of the estimated fair value of Anue’s net identifiable assets acquired (see summary of net assets below), and, as a result, we have recorded goodwill in connection with this transaction.
	The aggregate cash consideration paid totaled $152.4 million and is subject to certain post-closing adjustments including an adjustment based on the final amount of Anue’s closing net working capital. The acquisition was funded from our existing cash and sale of investments.
	Acquisition and other related costs, including integration activities, approximated $223,000 for the three months ended March 31, 2013. These acquisition and other related costs have been expensed as incurred, and have been included within the Acquisition and Other Related line item on our condensed consolidated statements of operations.
	The following table summarizes the preliminary allocation of the purchase price to the estimated fair values of the assets acquired and liabilities assumed at the date of acquisition (in thousands):
	Cash and cash equivalents	$	3,659
	Accounts receivable		11,843
	Inventories		4,380
	Prepaid and other assets		2,980
	Fixed assets		1,600
	Identifiable intangible assets		74,700
	Goodwill		91,376
	Total assets acquired		190,538
	Accounts payable, accrued expenses and other liabilities		(8,115	)
	Deferred revenues		(6,997	)
	Deferred tax liability, net		(22,986	)
	Net assets acquired	$	152,440
	During the fourth quarter of 2012, we increased our purchase price for Anue from $151.9 million to $152.4 million due to the updated computations of Anue’s net working capital and net taxes payable as of the closing date. We also updated the allocation of our purchase price to adjust certain deferred tax balances.
	The preliminary purchase price allocation is pending the completion of certain items, such as the final net working capital adjustment and the final tax attributes that will be finalized upon the filing of certain pre-acquisition tax returns.
	The identifiable intangible assets of $74.7 million consist of $45.0 million of acquired technology, $21.9 million of customer relationships, $4.0 million for the trade name, $2.1 million related to non-compete agreements and $1.7 million of other identifiable intangible assets. The fair values of the identifiable intangible assets have been estimated using the income approach, which includes the discounted cash flow and relief-from-royalty methods. These intangible assets will be amortized using a straight-line method over their expected useful lives ranging from six months to six years. The goodwill recorded in connection with this transaction is not deductible for U.S. income tax purposes.
	BreakingPoint Systems, Inc.
	On August 24, 2012, we completed our acquisition of all of the outstanding shares of capital stock of BreakingPoint Systems, Inc. (“BreakingPoint”). BreakingPoint is a leader in security testing, and its solutions provide global visibility into emerging threats and applications, along with advance insight into the resiliency of an organization’s information technology infrastructure under operationally relevant conditions and malicious attacks. With this acquisition, we have expanded our addressable market, broadened our product portfolio and grown our customer base. In addition, we expect to leverage BreakingPoint’s existing sales channels and assembled workforce, including its experienced product development and sales teams. These factors, among others, contributed to a purchase price in excess of the estimated fair value of BreakingPoint’s net identifiable assets acquired (see summary of net assets below), and, as a result, we have recorded goodwill in connection with this transaction.
	The aggregate cash consideration paid totaled $163.7 million, and was funded from our existing cash and sale of investments.
	Acquisition and other related costs, including integration activities, approximated $1.0 million for the three months ended March 31, 2013. These acquisition and other related costs have been expensed as incurred, and have been included within the Acquisition and Other Related line item on our condensed consolidated statements of operations.
	In connection with the acquisition, we may be obligated to pay up to $3.8 million to certain pre-acquisition employees of BreakingPoint over a weighted average period of less than two years provided they remain employees of Ixia. As of March 31, 2013, we have paid $1.1 million related to this obligation, of which $662,000 has been included within the Acquisition and Other Related line item on our condensed consolidated statements of operations for the three months ended March 31, 2013. The remaining accrual was included as a component of Accrued expenses and other in our consolidated balance sheets.
	The following table summarizes the preliminary allocation of the purchase price to the estimated fair values of the assets acquired and liabilities assumed at the date of acquisition (in thousands):
	Cash and cash equivalents	$	13,417
	Accounts receivable		4,552
	Inventories		3,156
	Prepaid and other assets		796
	Fixed assets		936
	Identifiable intangible assets		65,600
	Goodwill		102,652
	Total assets acquired		191,109
	Accounts payable, accrued expenses and other liabilities		(6,889	)
	Deferred revenues		(6,387	)
	Deferred tax liability, net		(14,146	)
	Net assets acquired	$	163,687
	During the fourth quarter of 2012, we reduced our purchase price for BreakingPoint from $164.1 million to $163.7 million as a result of the final computation of BreakingPoint’s closing net working capital. We also updated the allocation of our purchase price to adjust the values of certain intangible assets, to decrease the accrual for vacation and to modify certain deferred tax balances.
	The preliminary purchase price allocation is pending the completion of certain items, such as the final tax attributes that will be determined upon the filing of certain pre-acquisition tax returns.
	The identifiable intangible assets of $65.6 million consist of $22.7 million of acquired technology, $20.6 million of customer relationships, $16.6 million of service agreements, $2.9 million for the trade name, $2.2 million related to non-compete agreements and $600,000 of other identifiable intangible assets. The fair values of the identifiable intangible assets have been estimated using the income approach, which includes the discounted cash flow and relief-from-royalty methods. These intangible assets will be amortized using a straight-line method over their expected useful lives ranging from two weeks to six years. The goodwill recorded in connection with this transaction is not deductible for U.S. income tax purposes.
	Pro Forma and Post Acquisition Results (Unaudited)
	The following table summarizes the unaudited pro forma total revenues and net income of the combined entities, including Ixia, had the acquisitions of Anue and BreakingPoint occurred on January 1, 2011 (in thousands):
		Three Months Ended
		March 31,
		2012
	Total revenues	$	108,829
	Net income		1,253
	The pro forma combined results in the table above have been prepared for comparative purposes only and include acquisition related adjustments for, among others items, reductions in revenues related to the estimated fair value adjustment to deferred revenues, certain acquisition related costs, amortization of identifiable intangible assets, and the related income tax effects for these adjustments. The pro forma combined results, as well as those of Anue and BreakingPoint included in the Company’s results subsequent to the acquisition date, do not purport to be indicative of the results of operations which would have resulted had the acquisition been effective at the beginning of the applicable periods noted above, or the future results of operations of the combined entity.

Note_4_Restructuring

Note 4 - Restructuring	3 Months Ended
	Mar. 31, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring and Related Activities Disclosure [Text Block]	'
	4.     Restructuring
	During the third quarter of 2012, our management approved, committed to and initiated a plan to restructure our operations following our August 24, 2012 acquisition of BreakingPoint (“BreakingPoint Restructuring”). The BreakingPoint Restructuring included a net reduction in force of approximately 29 positions (primarily impacting our research and development team in Melbourne, Australia). For the year ended December 31, 2012, we recognized restructuring costs of approximately $4.1 million, and of this amount, $2.7 million primarily related to one-time employee termination benefits consisting of severance and other related costs and $1.4 million related to facility costs associated with the closure of our office in Melbourne, Australia and other costs, which were recorded to the Restructuring line item within our consolidated statement of operations. There were no restructuring activities prior to the third quarter of 2012.
	As of December 31, 2012, $1.0 million of such costs were accrued to the Accrued expenses and other line item within our consolidated balance sheets. The BreakingPoint Restructuring was substantially completed during the fourth quarter of 2012.
	As of March 31, 2013, $650,000 of such costs were accrued to the Accrued expenses and other line item within our consolidated balance sheets. These costs relate primarily to lease termination costs which are expected to be paid by the end of the second quarter of 2015.
	Activity related to our restructuring plan is as follows (in thousands):
	Accrual at December 31, 2011	$	-
	Charges		4,077
	Payments		(2,275	)
	Non-cash items		(776	)
	Accrual at December 31, 2012		1,026
	Charges		58
	Payments		(310	)
	Non-cash items		(124	)
	Accrual at March 31, 2013	$	650

Note_5_Convertible_Senior_Note

Note 5 - Convertible Senior Notes	3 Months Ended
	Mar. 31, 2013
Disclosure Text Block [Abstract]	'
Long-term Debt [Text Block]	'
	5.     Convertible Senior Notes
	On December 7, 2010, we issued $200.0 million in aggregate principal amount of 3.00% Convertible Senior Notes (the “Notes”) due December 15, 2015 unless earlier repurchased or converted. The interest is payable semi-annually on June 15 and December 15 of each year, beginning on June 15, 2011.  The Notes are governed by the terms of an indenture agreement (the "Indenture") dated December 7, 2010 between the Company and Wells Fargo Bank, National Association, as trustee.
	The Notes are convertible at any time prior to the close of business on the third business day immediately preceding the maturity date at the holder’s option, into shares of our common stock at an initial conversion rate of 51.4536 shares per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $19.43 per share. The conversion rate is subject to adjustment for certain events that occur prior to maturity, such as a change in control transaction as defined in the Indenture.
	The Notes bear interest at a rate of 3.00% per year, payable semiannually in arrears on June 15 and December 15 of each year, which payments began on June 15, 2011. We may in certain instances be required to pay additional interest if the Notes are not freely tradable by the holders thereof (other than our affiliates) beginning six months after the date of issuance and in connection with events of default, including events of default relating to our failure to comply with our reporting obligations to the trustee and the SEC. After a default under the Indenture, if the trustee or the holders of at least 25% in aggregate principal amount of the Notes give us notice of, and direct us to cure, the default and the default is not cured within 60 days thereafter, then unless a waiver is obtained from the holders of more than 50% in aggregate principal amount of the Notes, an event of default will occur under the Indenture. Upon any such event of default, we may elect that for the first 180 days (or such lesser amount of time during which the event of default continues), the sole remedy be the payment of additional interest at an annual rate equal to 0.50%. In the event that such additional interest becomes payable because of our failure to timely file certain reports with the SEC and the trustee, the filing of such reports should cure the event of default and the interest rate will be reduced (so long as no other events of default then exist). If we elect to pay such additional interest and the event of default is not cured within the 180-day period, or if we do not make such an election to pay additional interest when the event of default first occurs, the trustee or the holders of at least 25% in aggregate principal amount of the Notes may declare the Notes to be due and payable immediately.
	As of March 31, 2013, the estimated fair value of our Notes was approximately $258.3 million. The fair values of the Notes were estimated using market prices of the Notes, which are based on Level 2 inputs (i.e. inputs, other than the quoted prices in active markets that are observable either directly or indirectly).
	Senior Secured Revolving Credit Facility
	On December 21, 2012, we entered into a credit agreement (the “Credit Facility Agreement”) establishing a senior secured revolving credit facility (the “Credit Facility”) with certain institutional lenders that provides for an aggregate loan amount of up to $150.0 million. The Credit Facility is expected to mature on December 21, 2016, but may mature on September 14, 2015 if we do not have available liquidity (domestic cash and investments, plus availability under the Credit Facility) of $25.0 million in excess of the amount required to repay our Notes of $200.0 million in full beginning on June 15, 2015. If we satisfy this requirement between June 15, 2015 and September 14, 2015, but fail to do so after September 15, 2015 and prior to December 15, 2015, the maturity date is the date on which the requirement is no longer satisfied.
	The Credit Facility Agreement requires the Company to comply with certain covenants, including maintaining (i) an interest coverage ratio (as defined in the Credit Facility Agreement) of greater than 3.50 to 1.00, measured quarterly on a trailing twelve months basis and (ii) a maximum leverage ratio (as defined in the Credit Facility Agreement) of not greater than 3.50 to 1.00 through June 30, 2014 and 3.00 to 1.00 thereafter, measured quarterly on a trailing twelve months basis. The Credit Facility Agreement also requires us to timely provide certain periodic financial statements to the lenders.
	The Credit Facility Agreement also provides for customary events of default (subject to grace and cure periods in certain cases) including, without limitation, (a) failure to pay (with no grace period for the nonpayment of principal); (b) defaults under other documents executed and delivered in connection with the Credit Facility agreement; (c) bankruptcy or the commencement of insolvency proceedings, including the appointment of a receiver; (d) changes of control; and (e) failure to perform or observe covenants contained in the Credit Facility Agreement or related documents, including a covenant in the Credit Facility Agreement to comply with the Indenture governing our Notes that includes our obligation to timely file with the trustee under the Indenture the periodic financial and other reports that we are required to file with the SEC. Upon the occurrence of an event of default, the principal and accrued interest under the Credit Facility then outstanding may be declared due and payable. An event of default related to certain events of bankruptcy, insolvency or reorganization with respect to the Company will automatically cause the acceleration of payment of the unpaid principal and accrued interest of all outstanding loans.

Note_6_Selected_Balance_Sheet_

Note 6 - Selected Balance Sheet Data	3 Months Ended
	Mar. 31, 2013
Disclosure Text Block Supplement [Abstract]	'
Supplemental Balance Sheet Disclosures [Text Block]	'
	6.            Selected Balance Sheet Data
	Investments in Marketable Securities
	Investments in marketable securities as of March 31, 2013 consisted of the following (in thousands):
		Amortized		Gross Unrealized		Gross Unrealized			Fair
		Cost		Gains		Losses			Value
	Available-for-sale – short-term:
	U.S. Treasury, government and agency debt securities	$	53,089	$	41	$	—		$	53,130
	Corporate debt securities		85,387		1,254		(18	)		86,623
			138,476		1,295		(18	)		139,753
	Available-for-sale – long-term:
	Auction rate securities		820		2,347		—			3,167
			820		2,347		—			3,167
	Total	$	139,296	$	3,642	$	(18	)	$	142,920
	Investments in marketable securities as of December 31, 2012 consisted of the following (in thousands):
		Amortized		Gross Unrealized		Gross Unrealized			Fair
		Cost		Gains		Losses			Value
	Available-for-sale – short-term:
	U.S. Treasury, government and agency debt securities	$	77,823	$	48	$	(1	)	$	77,870
	Corporate debt securities		47,933		1,068		(20	)		48,981
			125,756		1,116		(21	)		126,851
	Available-for-sale – long-term:
	Auction rate securities		820		2,301		(2	)		3,119
			820		2,301		(2	)		3,119
	Total	$	126,576	$	3,417	$	(23	)	$	129,970
	As of March 31, 2013 and December 31, 2012, our available-for-sale securities had a weighted remaining contractual maturity of 1.31 and 1.36 years, respectively. For the three months ended March 31, 2013 and 2012, gross realized gains and gross realized losses were not significant.
	The amortized cost and fair value of our investments at March 31, 2013, by contractual years-to-maturity, are as follows (in thousands):
		Amortized Cost		Fair Value
	Due in less than 1 year	$	49,988	$	50,073
	Due within 1-2 years		57,163		57,300
	Due within 2-5 years		30,992		31,048
	Due after 5 years		1,153		4,499
	Total	$	139,296	$	142,920
	Accounts receivable, net
	Accounts receivable, net included an allowance for doubtful accounts of $1.8 million and $1.4 million as of March 31, 2013 and December 31, 2012, respectively.
	Inventories
	Inventories consist of the following (in thousands):
		March 31,		December 31,
		2013		2012
	Raw materials	$	3,265	$	4,530
	Work in process		18,779		14,144
	Finished goods		14,261		18,546
		$	36,305	$	37,220
	Goodwill and Other Intangible Assets
	The following table presents the 2012 and 2013 activity for our goodwill (in thousands):
	Balance at January 1, 2012:	$	66,429
	Acquisition of Anue		91,376
	Acquisition of BreakingPoint		102,652
	Balance at December 31, 2012:	$	260,457
	Adjustments		-
	Balance at March 31, 2013	$	260,457
	We have not had any historical goodwill impairment charges.
	The following table presents our purchased intangible assets (in thousands) as of March 31, 2013:
		Weighted
		Average
		Useful Life		Gross		Accumulated			Net
		(in years)				Amortization
	Other intangible assets:
	Technology		5.4	$	141,215	$	(72,222	)	$	68,993
	Customer relationships		6		70,376		(21,179	)		49,197
	Service agreements		5.7		22,700		(6,268	)		16,432
	Non-compete agreements		4.2		5,700		(1,864	)		3,836
	Trademark		5.3		8,976		(2,674	)		6,302
	Other		3.9		3,651		(1,312	)		2,339
			$	252,618	$	(105,519	)	$	147,099
The following table presents our purchased intangible assets (in thousands) as of December 31, 2012:
	Weighted
	Average
	Useful Life		Gross		Accumulated			Net
	(in years)				Amortization
Other intangible assets:
Technology		5.4	$	141,215	$	(66,704	)	$	74,511
Customer relationships		6		70,376		(18,289	)		52,087
Service agreements		5.7		22,700		(5,272	)		17,428
Non-compete agreements		4.2		5,700		(1,520	)		4,180
Trademark		5.3		8,976		(2,333	)		6,643
Other		3.8		3,416		(1,262	)		2,154
			$	252,383	$	(95,380	)	$	157,003
The estimated future amortization expense of purchased intangible assets as of March 31, 2013 is as follows (in thousands):
2013	$	29,674
2014		33,961
2015		29,277
2016		25,935
2017		18,907
Thereafter		9,345
	$	147,099

Note_7_Shareholders_Equity

Note 7 - Shareholders' Equity	3 Months Ended
	Mar. 31, 2013
Stockholders' Equity Note [Abstract]	'
Stockholders' Equity Note Disclosure [Text Block]	'
	7.            Shareholders’ Equity
	Accumulated Other Comprehensive Income
	We sold available-for-sale securities in the three months ended March 31, 2013 and 2012. The gains and losses were reclassified from accumulated other comprehensive income and included within our Interest income and other, net line item on our condensed consolidated statements of operations. The reclassification amounts for the three months ended March 31, 2013 were not significant. Prior to the reclassification for the sale of available-for-sale securities, noted above, we had a net unrealized gain arising during the periods of $166,000 for the three months ended March 31, 2013. The tax impact of unrealized gains and losses was $105,000 for the three months ended March 31, 2013.

Note_8_Earnings_Per_Share

Note 8 - Earnings Per Share	3 Months Ended
	Mar. 31, 2013
Earnings per share: [Abstract]	'
Earnings Per Share [Text Block]	'
	8.             Earnings Per Share
	The following table sets forth the computation of basic and diluted earnings per share for the three months ended March 31, 2013 and 2012 (in thousands, except per share data):
		Three months ended
		March 31,
		2013		2012
	Basic presentation:
	Numerator for basic earnings per share:
	Net income	$	7,820	$	5,167
	Denominator for basic earnings per share:
	Weighted average common shares outstanding		74,718		70,580
	Basic earnings per share	$	0.1	$	0.07
	Diluted presentation:
	Numerator for diluted earnings per share:
	Net income	$	7,820	$	5,167
	Interest expense on convertible senior notes, net of tax		—		—
	Net income used for diluted earnings per share	$	7,820	$	5,167
	Denominator for dilutive earnings per share:
	Weighted average common shares outstanding		74,718		70,580
	Effect of dilutive securities:
	Stock options and other share-based awards		2,201		2,374
	Convertible senior notes		—		—
	Dilutive potential common shares		76,919		72,954
	Diluted earnings per share	$	0.1	$	0.07
	The diluted earnings per share computation for the three months ended March 31, 2013 and 2012, excludes (i) the weighted average number of shares underlying our outstanding Notes of 10.3 million shares as such shares are considered anti-dilutive because the related interest expense on a per common share “if converted” basis exceeds basic earnings per share and (ii) the weighted average number of shares underlying our employee stock options and other share-based awards of 1.3 million shares and 1.5 million shares, respectively, which were anti-dilutive because, in general, the exercise price of these awards exceeded the average closing sales price per share of our common stock during the applicable period.

Note_9_Concentrations

Note 9 - Concentrations	3 Months Ended
	Mar. 31, 2013
Risks and Uncertainties [Abstract]	'
Concentration Risk Disclosure [Text Block]	'
	9.            Concentrations
	Significant Customers
	The following customers accounted for more than 10% of total revenue for the three months ended March 31, 2013, in the case of Customer A, and for the three months ended March 31, 2013 and 2012, in the case of Customer B:
		Three months ended
		March 31,
		2013			2012
	Customer A		18.6	%		*
	Customer B		11.5	%		17.1	%
	* Less than 10%
	As of March 31, 2013 and December 31, 2012, the percentage of total receivables for Customer B above was as follows:
		March 31,			December 31,
		2013			2012
	Customer B		11.5	%		*
	* Less than 10%
	International Data
	For the three months ended March 31, 2013 and 2012, the percentage of total international revenues based on customer location consisted of the following:
		Three months ended
		March 31,
		2013			2012
	International revenues		37.8	%		49.1	%
	Within international revenues disclosed above, the percentage of total revenues from product shipments to Japan for the three months ended March 31, 2013 and 2012 were as follows:
		Three months ended
		March 31,
		2013			2012
	Japan		12.4	%		14	%

Note_10_Fair_Value_Measurement

Note 10 - Fair Value Measurements	3 Months Ended
	Mar. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures [Text Block]	'
	10.          Fair Value Measurements
	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in the principal or most advantageous market for an asset or liability in an orderly transaction between market participants at the measurement date. The hierarchy below lists three levels of fair value based on the extent to which inputs used in measuring fair value are observable in the market. We categorize each of our fair value measurements in one of these three levels based on the lowest level input that is significant to the fair value measurement in its entirety. This hierarchy prioritizes the inputs into three broad levels as follows:
	Level 1.	Observable inputs such as quoted prices in active markets;
	Level 2.	Inputs, other than quoted prices in active markets, that are observable either directly or indirectly; and
	Level 3.	Unobservable inputs in which there is little or no market data, which require the reporting entity to develop its own assumptions.
	Financial assets carried at fair value as of March 31, 2013 and December 31, 2012 are classified in the table below in one of the three categories described above (in thousands):
			31-Mar-13								31-Dec-12
			Fair Value		Quoted		Significant		Significant		Fair Value		Quoted		Significant		Significant
					Prices in		Other		Unobservable				Prices in		Other		Unobservable
					Active		Observable		Inputs				Active		Observable		Inputs
					Markets for		Inputs		(Level 3)				Markets for		Inputs		(Level 3)
					Identical		(Level 2)						Identical		(Level 2)
					Assets								Assets
					(Level 1)								(Level 1)
	Cash equivalents:
	Money market funds		$	156	$	156	$	—	$	—	$	185	$	185	$	—	$	—
	Corporate debt securities			18,994		—		18,994		—		—		—		—		—
	Short-term investments:
	U.S. Treasury, government and agency debt securities			53,130		—		53,130		—		77,870		—		77,870		—
	Corporate debt securities			86,623		—		86,623		—		48,981		—		48,981		—
	Long-term investments:
	Auction rate securities			3,167		—		—		3,167		3,119		—		—		3,119
	Total financial assets		$	162,070	$	156	$	158,747	$	3,167	$	130,155	$	185	$	126,851	$	3,119
	To estimate the fair value of our money market funds, U.S. treasury, government and agency debt securities and corporate debt securities, we use the estimated fair value per our investment brokerage/custodial statements. To the extent deemed necessary, we may also obtain non-binding market quotes to corroborate the estimated fair values reflected in our investment brokerage/custodial statements.
	As of March 31, 2013, we held $3.2 million of auction rate securities which we classify as Level 3 because they are valued using valuation models with unobservable inputs. Given the disruption in the auction process, there is no longer an actively quoted market price for these securities. Accordingly, we utilized models to estimate the fair values of these auction rate securities based on, certain unobservable inputs and other items, including: (i) the underlying structure of each security; (ii) the present value of future principal, interest and/or dividend payments discounted at the appropriate rate considering the market rate and conditions; (iii) consideration of the probabilities of default, auction failure, or repurchase at par for each period; and (iv) credit quality and estimates of the recovery rates in the event of default for each security. These estimated fair values could change significantly based on, among other events: (i) a further deterioration in market conditions for these securities; (ii) further declines in the credit quality of our auction rate securities or of the issuers of our auction rate securities; or (iii) a cessation of dividend payments or default on interest or principal payments by the issuer of the securities. Significant increases or decreases in any of these unobservable inputs in isolation may result in a significantly lower or higher fair value measurement.
	There were no transfers of assets between levels within the fair value hierarchy for the three-month period ended March 31, 2013.
	The following table summarizes the activity for the three months ended March 31, 2013 and 2012 for our auction rate securities where fair value measurements are estimated utilizing Level 3 inputs (in thousands):
			Three months ended
			March 31,
			2013		2012
	Beginning balance		$	3,119	$	2,774
	Unrealized gain recorded in other comprehensive income			48		180
	Realized gain recorded in earnings			—		—
	Settlements			—		—
	Ending balance		$	3,167	$	2,954
	There were no unrealized losses recorded in earnings for Level 3 assets still held at March 31, 2013.

Note_11_Commitments_and_Contin

Note 11 - Commitments and Contingencies	3 Months Ended
	Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies Disclosure [Text Block]	'
	11.          Commitments and Contingencies
	Litigation
	On June 15, 2012, Catapult, our wholly owned subsidiary, issued a demand for indemnification to Tekelec pursuant to the Asset Purchase Agreement between Tekelec and Catapult dated July 15, 2002 (the “APA”) under which Catapult had succeeded to Tekelec’s relationship with Tucana, a former distributor of Catapult. Catapult demanded indemnification for the full amount of Catapult’s costs, including attorneys’ fees and expenses, incurred in defending against and resolving Tucana’s claims.
	Because Catapult’s demand for indemnification was not resolved within the 30-day period provided for by the APA, on July 16, 2012, Catapult demanded arbitration of its indemnification claim against Tekelec. The arbitration hearing took place before three arbitrators on January 14 and 15, 2013. The arbitrators issued their final award on January 31, 2013 granting Catapult its full indemnity claim against Tekelec in the amount of approximately $1.2 million. The $1.2 million of proceeds were received in the first quarter of 2013 and were reflected in our results of operations as a component of the General and administrative line item on our condensed consolidated statements of operations.
	We are not aware of any pending legal proceedings that, individually or in the aggregate, could have a material adverse effect on our business, results of operations, cash flows or financial position. We may in the future be a party to litigation arising in the ordinary course of business, including claims that we allegedly infringe upon third party patents or other intellectual property rights. Such claims, even if without merit, could result in the expenditure of significant financial and managerial resources.

Note_12_Income_Taxes

Note 12 - Income Taxes	3 Months Ended
	Mar. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Tax Disclosure [Text Block]	'
	12.          Income Taxes
	As of March 31, 2013 and December 31, 2012, current deferred tax assets totaled $24.0 million and $24.2 million, respectively, and were included within the Prepaid expenses & other current assets line item in our condensed consolidated balance sheets.
	During the 2013 first quarter, the Company recorded a $2.0 million tax benefit due to the retroactive renewal of the 2012 federal R&D tax credit.

Note_13_Restatements

Note 13 - Restatements	3 Months Ended
	Mar. 31, 2013
Accounting Changes and Error Corrections [Abstract]	'
Accounting Changes and Error Corrections [Text Block]	'
	13.          Restatements
	Quarterly financial statements as of and for the quarter ended March 31, 2013
	Subsequent to the initial filing of the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2013, we have restated herein our unaudited interim condensed consolidated financial statements as of and for the quarter ended March 31, 2013 to reflect certain corrections in the manner in which we recognize revenue related to certain sales transactions that impacted the first quarter of 2013.  The errors identified by the Company in its revenue recognition practices are described below:
		●	For certain sales transactions, the Company entered into an extended maintenance and warranty arrangement that included a fixed fee to cover products owned by the customer at the date of execution of the arrangement as well as extended maintenance and warranty coverage on any additional products purchased by the customers over the multi-year term of the applicable arrangement.  The Company did not properly defer revenues on the additional product purchases to correctly account for the fixed fee, multi-year extended maintenance and warranty arrangement.  As a result, the Company improperly recognized product revenues when the additional products were shipped rather than deferring a portion of the consideration and recognizing the related revenues over the remaining term of the applicable fixed fee, multi-year extended maintenance and warranty arrangement.
		●	For certain other sales transactions, the Company (i) recognized product revenues prematurely in advance of delivering certain product functionality or other deliverables that were committed to be provided to the customers or (ii) recognized product revenues prematurely based on an incorrect assessment of certain multiple-element arrangement sales transactions that included professional services that were provided based on a purchase order that was separate from the product purchase order but that was negotiated concurrently with the customer.
		●	The Company entered into a sales arrangement that included extended payment terms beyond the Company’s customary terms.  Revenue for this transaction should have been, but was not, recognized when the payments became due, as opposed to when the products were shipped.
			These corrections in our revenue recognition resulted in the movements of revenue between accounting periods, and do not have any impact on the total revenue to be recognized over the life of the applicable arrangements.
	The previously filed interim condensed consolidated financial statements for the quarter ended March 31, 2013 have been restated to reflect the correction of these errors, which impact revenue from products, revenue from services and current deferred revenue. All other adjustments relate to the applicable income tax effects of these errors as well as the correction of other cumulative tax errors which existed as of March 31, 2013. Such other cumulative tax errors resulted in $639,000 of out-of-period adjustments which increased the Company’s income tax benefit for the quarter ended March 31, 2013, and increased prepaid expenses and other assets, other assets, and other liabilities by amounts shown in the following table.
	Restated condensed consolidated balance sheet amounts
			As of March 31, 2013
			As Previously			Restatement
			Reported			Adjustments			Restated
			(in thousands)
	Prepaid expenses and other current assets		$	43,790		$	2,567		$	46,357
	Total current assets			385,038			2,567			387,605
	Other assets			11,814			1,809			13,623
	Total assets			836,780			4,376			841,156
	Deferred revenues - current			65,280			1,323			66,603
	Total current liabilities			121,933			1,323			123,256
	Other liabilities			33,646			3,338			36,984
	Total liabilities			366,181			4,661			370,842
	Retained earnings			125,401			(285	)		125,116
	Total shareholders’ equity			470,599			(285	)		470,314
	Total liabilities and shareholders’ equity		$	836,780		$	4,376		$	841,156
	Restated condensed consolidated statement of operations amounts
			For the Three Months Ended March 31, 2013
			As Previously			Restatement
			Reported			Adjustments			Restated
			(in thousands, except per share data)
	Revenues:
	Products		$	96,636		$	(1,125	)	$	95,511
	Services			26,147			(199	)		25,948
	Total revenues			122,783			(1,324	)		121,459
	Income from operations			10,092			(1,324	)		8,768
	Income before income taxes			8,356			(1,324	)		7,032
	Income tax expense (benefit)			251			(1,039	)		(788	)
	Net income			8,105			(285	)		7,820
	Earnings per share:
	Basic		$	0.11		$	(0.01	)	$	0.1
	Diluted		$	0.11		$	(0.01	)	$	0.1
	Restated condensed consolidated statements of comprehensive income amounts
			For the Three Months Ended March 31, 2013
			As Previously			Restatement			Restated
			Reported			Adjustments
			(in thousands)
	Net Income		$	8,105		$	(285	)	$	7,820
	Comprehensive Income		$	7,927		$	(286	)	$	7,641
	Restated condensed consolidated statements of cash flows amounts
	The correction of the errors described above did not impact our total cash flows from operating activities, investing activities or financing activities within our consolidated statement of cash flows, but did result in corrections of the following line items within cash flows from operations activities:
			For the Three Months Ended March 31, 2013
			As Previously			Restatement			Restated
			Reported			Adjustments
			(in thousands)
	Net Income		$	8,105		$	(285	)	$	7,820
	Deferred Income Taxes			(1,561	)		(252	)		(1,813	)
	Prepaid Expenses and Other Current Assets			(1,387	)		(2,567	)		(3,954	)
	Other Assets			48			1,691			1,739
	Deferred Revenues			1,091			1,323			2,414
	Other Liabilities			2,941			90			3,031
	Quarterly financial statements as of and for the quarter ended March 31, 2012
	In our 2012 Form 10-K, we restated, among other previously issued financial statements, our consolidated financial statements for the quarter ended March 31, 2012 to reflect certain corrections in the manner in which we recognized revenue related to our warranty and software maintenance contracts, including a previous implied warranty and software maintenance arrangement with one of our customers. Specifically, we made the following two corrections to our revenue recognition practices to properly report revenue in prior periods:
		●	Accounting Practice Errors – We now recognize revenue related to our warranty and software maintenance contracts on the effective date of each such contract rather than in the first calendar month following the effective date of the contract as though the warranty and maintenance period commenced on the first day of such month. We also now recognize revenue related to back maintenance fees when evidence of an arrangement exists rather than commencing in the first calendar month following the effective date of the contract as though the warranty and maintenance period commenced on the first day of such month.
		●	Implied Arrangement Error - We now cease to defer revenue for any implied warranty and software maintenance arrangement upon the receipt from the applicable customer of the first substantive contract for extended warranty and software maintenance services, and we will recognize the applicable previously deferred revenue related to the implied arrangement, provided all other revenue recognition criteria have been met. The Company’s historical practice was to continue to defer revenue for implied warranty and software maintenance arrangements (despite the receipt of an initial substantive extended warranty and software maintenance contract) until we could establish a pattern that we were able to enforce our warranty and software maintenance contracts as evidenced by, among other items, (i) the consistent receipt of extended renewal orders from the specific customer for warranty and software maintenance services and (ii) senior management’s assertion that warranty and software maintenance services would not be provided to the customer if existing contracts were canceled or were not renewed.
The 2012 changes in our revenue recognition practices resulted in movements of revenue between accounting periods, and do not have any impact on the total revenue to be recognized over the life of a warranty and software maintenance contract or arrangement, although the timing of the recognition of such revenue commences earlier and ends earlier than would be the case under the Company’s previously used accounting treatment.
This Quarterly Report on Form 10-Q/A for the quarter ended March 31, 2013 (this “Form 10-Q/A”) reflects the impact of the prior restatement on the applicable unaudited quarterly financial information for the three months ended March 31, 2012. Our previously filed Quarterly Report on Form 10-Q for the quarter ended March 31, 2012 has not been and will not be amended.
Certain line items included in this Form 10-Q/A have been restated to reflect the corrections of these errors, which impact revenues from products, revenues from services and deferred revenues (current and non-current). All other adjustments related to the applicable income tax effects of these errors. The following tables reconcile the amounts as originally reported in our Quarterly Report on Form 10-Q for the quarter ended March 31, 2012 to the corresponding amounts as restated and included in Note 15, Restatement, in our 2012 Form 10-K and as reported herein.
Restated consolidated statement of operations amounts
		For the Three Months Ended
		31-Mar-12
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands, except per share data)
Revenues:
Products
Implied arrangement error		$	—		$	564		$	—
			69,043			564			69,607
Services
Accounting practice error			—			688			—
Implied arrangement error			—			(237	)		—
			16,600			451			17,051
Total revenues			85,643			1,015			86,658
Income from operations			7,287			1,015			8,302
Income before income taxes			5,597			1,015			6,612
Income tax expense			1,215			230			1,445
Net income			4,382			785			5,167
Earnings per share:
Basic		$	0.06		$	0.01		$	0.07
Diluted		$	0.06		$	0.01		$	0.07
Restated consolidated statements of comprehensive income amounts
		For the Three Months Ended
		31-Mar-12
		As			Restatement			Restated
		Previously			Adjustments
		Reported
		(in thousands)
Net income		$	4,382		$	785		$	5,167
Comprehensive income		$	5,169		$	785		$	5,954
Restated consolidated statements of cash flows amounts
The correction of the errors described above did not impact our total cash flows from operating activities, investing activities or financing activities within our consolidated statement of cash flows, but did result in corrections of the following line items within cash flows from operating activities:
		For the Three Months Ended
		31-Mar-12
		As			Restatement			Restated
		Previously			Adjustments
		Reported
		(in thousands)
Net income		$	4,382		$	785		$	5,167
Accrued expenses and other			4,389			230			4,619
Deferred revenues			5,896			(1,015	)		4,881

Note_3_Acquisitions_Tables

Note 3 - Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2013
Business Combinations [Abstract]	'
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	'
	Cash and cash equivalents	$	3,659
	Accounts receivable		11,843
	Inventories		4,380
	Prepaid and other assets		2,980
	Fixed assets		1,600
	Identifiable intangible assets		74,700
	Goodwill		91,376
	Total assets acquired		190,538
	Accounts payable, accrued expenses and other liabilities		(8,115	)
	Deferred revenues		(6,997	)
	Deferred tax liability, net		(22,986	)
	Net assets acquired	$	152,440
	Cash and cash equivalents	$	13,417
	Accounts receivable		4,552
	Inventories		3,156
	Prepaid and other assets		796
	Fixed assets		936
	Identifiable intangible assets		65,600
	Goodwill		102,652
	Total assets acquired		191,109
	Accounts payable, accrued expenses and other liabilities		(6,889	)
	Deferred revenues		(6,387	)
	Deferred tax liability, net		(14,146	)
	Net assets acquired	$	163,687
Business Acquisition, Pro Forma Information [Table Text Block]	'
		Three Months Ended
		March 31,
		2012
	Total revenues	$	108,829
	Net income		1,253

Note_4_Restructuring_Tables

Note 4 - Restructuring (Tables)	3 Months Ended
	Mar. 31, 2013
Restructuring and Related Activities [Abstract]	'
Restructuring and Related Costs [Table Text Block]	'
	Accrual at December 31, 2011	$	-
	Charges		4,077
	Payments		(2,275	)
	Non-cash items		(776	)
	Accrual at December 31, 2012		1,026
	Charges		58
	Payments		(310	)
	Non-cash items		(124	)
	Accrual at March 31, 2013	$	650

Note_6_Selected_Balance_Sheet_1

Note 6 - Selected Balance Sheet Data (Tables)	3 Months Ended
	Mar. 31, 2013
Disclosure Text Block Supplement [Abstract]	'
Available-for-sale Securities [Table Text Block]	'
		Amortized		Gross Unrealized		Gross Unrealized			Fair
		Cost		Gains		Losses			Value
	Available-for-sale – short-term:
	U.S. Treasury, government and agency debt securities	$	53,089	$	41	$	—		$	53,130
	Corporate debt securities		85,387		1,254		(18	)		86,623
			138,476		1,295		(18	)		139,753
	Available-for-sale – long-term:
	Auction rate securities		820		2,347		—			3,167
			820		2,347		—			3,167
	Total	$	139,296	$	3,642	$	(18	)	$	142,920
		Amortized		Gross Unrealized		Gross Unrealized			Fair
		Cost		Gains		Losses			Value
	Available-for-sale – short-term:
	U.S. Treasury, government and agency debt securities	$	77,823	$	48	$	(1	)	$	77,870
	Corporate debt securities		47,933		1,068		(20	)		48,981
			125,756		1,116		(21	)		126,851
	Available-for-sale – long-term:
	Auction rate securities		820		2,301		(2	)		3,119
			820		2,301		(2	)		3,119
	Total	$	126,576	$	3,417	$	(23	)	$	129,970
Investments Classified by Contractual Maturity Date [Table Text Block]	'
		Amortized Cost		Fair Value
	Due in less than 1 year	$	49,988	$	50,073
	Due within 1-2 years		57,163		57,300
	Due within 2-5 years		30,992		31,048
	Due after 5 years		1,153		4,499
	Total	$	139,296	$	142,920
Schedule of Inventory, Current [Table Text Block]	'
		March 31,		December 31,
		2013		2012
	Raw materials	$	3,265	$	4,530
	Work in process		18,779		14,144
	Finished goods		14,261		18,546
		$	36,305	$	37,220
Schedule of Goodwill [Table Text Block]	'
	Balance at January 1, 2012:	$	66,429
	Acquisition of Anue		91,376
	Acquisition of BreakingPoint		102,652
	Balance at December 31, 2012:	$	260,457
	Adjustments		-
	Balance at March 31, 2013	$	260,457
Schedule of Finite-Lived Intangible Assets [Table Text Block]	'
		Weighted
		Average
		Useful Life		Gross		Accumulated			Net
		(in years)				Amortization
	Other intangible assets:
	Technology		5.4	$	141,215	$	(72,222	)	$	68,993
	Customer relationships		6		70,376		(21,179	)		49,197
	Service agreements		5.7		22,700		(6,268	)		16,432
	Non-compete agreements		4.2		5,700		(1,864	)		3,836
	Trademark		5.3		8,976		(2,674	)		6,302
	Other		3.9		3,651		(1,312	)		2,339
				$	252,618	$	(105,519	)	$	147,099
		Weighted
		Average
		Useful Life		Gross		Accumulated			Net
		(in years)				Amortization
	Other intangible assets:
	Technology		5.4	$	141,215	$	(66,704	)	$	74,511
	Customer relationships		6		70,376		(18,289	)		52,087
	Service agreements		5.7		22,700		(5,272	)		17,428
	Non-compete agreements		4.2		5,700		(1,520	)		4,180
	Trademark		5.3		8,976		(2,333	)		6,643
	Other		3.8		3,416		(1,262	)		2,154
				$	252,383	$	(95,380	)	$	157,003
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	'
	2013	$	29,674
	2014		33,961
	2015		29,277
	2016		25,935
	2017		18,907
	Thereafter		9,345
		$	147,099

Note_8_Earnings_Per_Share_Tabl

Note 8 - Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2013
Earnings per share: [Abstract]	'
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	'
		Three months ended
		March 31,
		2013		2012
	Basic presentation:
	Numerator for basic earnings per share:
	Net income	$	7,820	$	5,167
	Denominator for basic earnings per share:
	Weighted average common shares outstanding		74,718		70,580
	Basic earnings per share	$	0.1	$	0.07
	Diluted presentation:
	Numerator for diluted earnings per share:
	Net income	$	7,820	$	5,167
	Interest expense on convertible senior notes, net of tax		—		—
	Net income used for diluted earnings per share	$	7,820	$	5,167
	Denominator for dilutive earnings per share:
	Weighted average common shares outstanding		74,718		70,580
	Effect of dilutive securities:
	Stock options and other share-based awards		2,201		2,374
	Convertible senior notes		—		—
	Dilutive potential common shares		76,919		72,954
	Diluted earnings per share	$	0.1	$	0.07

Note_9_Concentrations_Tables

Note 9 - Concentrations (Tables)	3 Months Ended
	Mar. 31, 2013
Sales Revenue, Goods, Net [Member]	'
Note 9 - Concentrations (Tables) [Line Items]	'
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	'
		Three months ended
		March 31,
		2013			2012
	Customer A		18.6	%		*
	Customer B		11.5	%		17.1	%
		Three months ended
		March 31,
		2013			2012
	International revenues		37.8	%		49.1	%
		Three months ended
		March 31,
		2013			2012
	Japan		12.4	%		14	%
Accounts Receivable [Member]	'
Note 9 - Concentrations (Tables) [Line Items]	'
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	'
		March 31,			December 31,
		2013			2012
	Customer B		11.5	%		*

Note_10_Fair_Value_Measurement1

Note 10 - Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value, Assets Measured on Recurring Basis [Table Text Block]	'
		31-Mar-13								31-Dec-12
		Fair Value		Quoted		Significant		Significant		Fair Value		Quoted		Significant		Significant
				Prices in		Other		Unobservable				Prices in		Other		Unobservable
				Active		Observable		Inputs				Active		Observable		Inputs
				Markets for		Inputs		(Level 3)				Markets for		Inputs		(Level 3)
				Identical		(Level 2)						Identical		(Level 2)
				Assets								Assets
				(Level 1)								(Level 1)
	Cash equivalents:
	Money market funds	$	156	$	156	$	—	$	—	$	185	$	185	$	—	$	—
	Corporate debt securities		18,994		—		18,994		—		—		—		—		—
	Short-term investments:
	U.S. Treasury, government and agency debt securities		53,130		—		53,130		—		77,870		—		77,870		—
	Corporate debt securities		86,623		—		86,623		—		48,981		—		48,981		—
	Long-term investments:
	Auction rate securities		3,167		—		—		3,167		3,119		—		—		3,119
	Total financial assets	$	162,070	$	156	$	158,747	$	3,167	$	130,155	$	185	$	126,851	$	3,119
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]	'
		Three months ended
		March 31,
		2013		2012
	Beginning balance	$	3,119	$	2,774
	Unrealized gain recorded in other comprehensive income		48		180
	Realized gain recorded in earnings		—		—
	Settlements		—		—
	Ending balance	$	3,167	$	2,954

Note_13_Restatements_Tables

Note 13 - Restatements (Tables)	3 Months Ended
	Mar. 31, 2013
Accounting Changes and Error Corrections [Abstract]	'
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]	'
		As of March 31, 2013
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands)
	Prepaid expenses and other current assets	$	43,790		$	2,567		$	46,357
	Total current assets		385,038			2,567			387,605
	Other assets		11,814			1,809			13,623
	Total assets		836,780			4,376			841,156
	Deferred revenues - current		65,280			1,323			66,603
	Total current liabilities		121,933			1,323			123,256
	Other liabilities		33,646			3,338			36,984
	Total liabilities		366,181			4,661			370,842
	Retained earnings		125,401			(285	)		125,116
	Total shareholders’ equity		470,599			(285	)		470,314
	Total liabilities and shareholders’ equity	$	836,780		$	4,376		$	841,156
		For the Three Months Ended March 31, 2013
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands, except per share data)
	Revenues:
	Products	$	96,636		$	(1,125	)	$	95,511
	Services		26,147			(199	)		25,948
	Total revenues		122,783			(1,324	)		121,459
	Income from operations		10,092			(1,324	)		8,768
	Income before income taxes		8,356			(1,324	)		7,032
	Income tax expense (benefit)		251			(1,039	)		(788	)
	Net income		8,105			(285	)		7,820
	Earnings per share:
	Basic	$	0.11		$	(0.01	)	$	0.1
	Diluted	$	0.11		$	(0.01	)	$	0.1
		For the Three Months Ended March 31, 2013
		As Previously			Restatement			Restated
		Reported			Adjustments
		(in thousands)
	Net Income	$	8,105		$	(285	)	$	7,820
	Comprehensive Income	$	7,927		$	(286	)	$	7,641
		For the Three Months Ended March 31, 2013
		As Previously			Restatement			Restated
		Reported			Adjustments
		(in thousands)
	Net Income	$	8,105		$	(285	)	$	7,820
	Deferred Income Taxes		(1,561	)		(252	)		(1,813	)
	Prepaid Expenses and Other Current Assets		(1,387	)		(2,567	)		(3,954	)
	Other Assets		48			1,691			1,739
	Deferred Revenues		1,091			1,323			2,414
	Other Liabilities		2,941			90			3,031
		For the Three Months Ended
		31-Mar-12
		As Previously			Restatement
		Reported			Adjustments			Restated
		(in thousands, except per share data)
	Revenues:
	Products
	Implied arrangement error	$	—		$	564		$	—
			69,043			564			69,607
	Services
	Accounting practice error		—			688			—
	Implied arrangement error		—			(237	)		—
			16,600			451			17,051
	Total revenues		85,643			1,015			86,658
	Income from operations		7,287			1,015			8,302
	Income before income taxes		5,597			1,015			6,612
	Income tax expense		1,215			230			1,445
Net income		4,382			785			5,167
Earnings per share:
Basic	$	0.06		$	0.01		$	0.07
Diluted	$	0.06		$	0.01		$	0.07
	For the Three Months Ended
	31-Mar-12
	As			Restatement			Restated
	Previously			Adjustments
	Reported
	(in thousands)
Net income	$	4,382		$	785		$	5,167
Comprehensive income	$	5,169		$	785		$	5,954
	For the Three Months Ended
	31-Mar-12
	As			Restatement			Restated
	Previously			Adjustments
	Reported
	(in thousands)
Net income	$	4,382		$	785		$	5,167
Accrued expenses and other		4,389			230			4,619
Deferred revenues		5,896			(1,015	)		4,881

Note_3_Acquisitions_Details

Note 3 - Acquisitions (Details) (USD $)

3 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

3 Months Ended

12 Months Ended

0 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Mar. 31, 2013

Jun. 01, 2012

Jun. 01, 2012

Jun. 01, 2012

Jun. 01, 2012

Jun. 01, 2012

Jun. 01, 2012

Mar. 31, 2013

Dec. 31, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Aug. 24, 2012

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2012

Mar. 31, 2013

Dec. 31, 2012

Jun. 01, 2012

Aug. 24, 2012

Jun. 01, 2012

Aug. 24, 2012

Payments to Pre-Acquisition Employees of BreakingPoint [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

Anue Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

Customer Relationships [Member]

Customer Relationships [Member]

Noncompete Agreements [Member]

Noncompete Agreements [Member]

Other Intangible Assets [Member]

Other Intangible Assets [Member]

Service Agreements [Member]

Service Agreements [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

BreakingPoint Systems, Inc. [Member]

Developed Technology Rights [Member]

Customer Relationships [Member]

Trade Names [Member]

Noncompete Agreements [Member]

Other Intangible Assets [Member]

Developed Technology Rights [Member]

Customer Relationships [Member]

Trade Names [Member]

Noncompete Agreements [Member]

Other Intangible Assets [Member]

Service Agreements [Member]

Anue Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

Anue Systems, Inc. [Member]

BreakingPoint Systems, Inc. [Member]

Note 3 - Acquisitions (Details) [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments to Acquire Businesses, Gross

'

'

'

'

'

'

'

'

$152,400,000

'

'

'

'

'

'

'

'

$163,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Acquisition Related Costs

1,272,000

425,000

662,000

'

'

'

'

'

'

223,000

'

'

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Consideration Transferred

'

'

'

'

'

'

'

'

151,900,000

'

152,400,000

'

'

'

'

'

'

164,100,000

'

163,700,000

'

'

'

'

'

'

'

'

'

'

'

'

Finite-lived Intangible Assets Acquired

'

'

'

45,000,000

21,900,000

4,000,000

2,100,000

1,700,000

74,700,000

'

'

22,700,000

20,600,000

2,900,000

2,200,000

600,000

16,600,000

65,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquired Finite-lived Intangible Assets, Weighted Average Useful Life

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'6 years

'6 years

'4 years 73 days

'4 years 73 days

'3 years 328 days

'3 years 292 days

'5 years 255 days

'5 years 255 days

'6 months

'14 days

'6 years

'6 years

Business Acquisition, Potential Cash Payment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Potential Cash Payment, Payment Period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'2 years

Payments to Certain Pre-acquisition Employees

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Note_3_Acquisitions_Details_Pr

Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price (USD $)	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 01, 2012	Aug. 24, 2012
In Thousands, unless otherwise specified				Anue Systems, Inc. [Member]	BreakingPoint Systems, Inc. [Member]
Note 3 - Acquisitions (Details) - Preliminary Allocation of Purchase Price [Line Items]	'	'	'	'	'
Cash and cash equivalents	'	'	'	$3,659	$13,417
Accounts receivable	'	'	'	11,843	4,552
Inventories	'	'	'	4,380	3,156
Prepaid and other assets	'	'	'	2,980	796
Fixed assets, net	'	'	'	1,600	936
Identifiable intangible assets	'	'	'	74,700	65,600
Goodwill	260,457	260,457	66,429	91,376	102,652
Total assets acquired	'	'	'	190,538	191,109
Accounts payable, accrued expenses and other liabilities	'	'	'	-8,115	-6,889
Deferred revenues	'	'	'	-6,997	-6,387
Deferred tax liability, net	'	'	'	-22,986	-14,146
Net assets acquired	'	'	'	$152,440	$163,687

Note_3_Acquisitions_Details_Pr1

Note 3 - Acquisitions (Details) - Pro Forma Revenues and Net Income of the Combined Entity (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2013
Pro Forma Revenues and Net Income of the Combined Entity [Abstract]	'
Total revenues	$108,829
Net income	$1,253

Note_4_Restructuring_Details

Note 4 - Restructuring (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Note 4 - Restructuring (Details) [Line Items]	'	'	'	'
Restructuring and Related Cost, Number of Positions Eliminated	'	29	'	'
Restructuring Charges	$58,000	'	$4,077,000	'
Restructuring Reserve	650,000	'	1,026,000	0
Employee Severance [Member]	'	'	'	'
Note 4 - Restructuring (Details) [Line Items]	'	'	'	'
Restructuring Charges	'	'	2,700,000	'
Facility Closing [Member]	'	'	'	'
Note 4 - Restructuring (Details) [Line Items]	'	'	'	'
Restructuring Charges	'	'	$1,400,000	'

Note_4_Restructuring_Details_A

Note 4 - Restructuring (Details) - Activity Related to Restructuring Plan (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Activity Related to Restructuring Plan [Abstract]	'	'
Accrual at	$1,026,000	$0
Charges	58,000	4,077,000
Payments	-310,000	-2,275,000
Non-cash items	-124,000	-776,000
Accrual at	$650,000	$1,026,000

Note_5_Convertible_Senior_Note1

Note 5 - Convertible Senior Notes (Details) (USD $)	1 Months Ended	24 Months Ended				1 Months Ended		22 Months Ended
	Dec. 21, 2012	Dec. 07, 2012	Mar. 31, 2013	Dec. 31, 2012	Dec. 07, 2010	Dec. 21, 2012	Dec. 21, 2012	Mar. 31, 2013	Mar. 31, 2013
						Through June 30, 2014 [Member]	After June 30, 2014 [Member]	Defualt Rate [Member]	Fair Value, Inputs, Level 2 [Member]
Note 5 - Convertible Senior Notes (Details) [Line Items]	'	'	'	'	'	'	'	'	'
Convertible Notes Payable, Noncurrent (in Dollars)	'	'	$200,000,000	$200,000,000	$200,000,000	'	'	'	'
Debt Instrument, Interest Rate, Stated Percentage	'	'	'	'	3.00%	'	'	'	'
Debt Instrument, Convertible, Conversion Ratio	'	51.4536	'	'	'	'	'	'	'
Debt Instrument Convertible Principal Amount (in Dollars)	'	1,000	'	'	'	'	'	'	'
Debt Instrument, Convertible, Conversion Price (in Dollars per share)	'	$19.43	'	'	'	'	'	'	'
Minimum Aggregate Principal Amount of Outstanding Notes Threshold	'	'	'	'	25.00%	'	'	'	'
Debt Instrument, Basis Spread on Variable Rate	'	'	'	'	'	'	'	0.50%	'
Convertible Debt, Fair Value Disclosures (in Dollars)	'	'	'	'	'	'	'	'	258,300,000
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)	150,000,000	'	'	'	'	'	'	'	'
Debt Covenants Available Liquidity (in Dollars)	$25,000,000	'	'	'	'	'	'	'	'
Debt Covenants Interest Coverage Ratio	3.5	'	'	'	'	'	'	'	'
Debt Covenants Maximum Leverage Ratio	'	'	'	'	'	3.5	3	'	'

Note_6_Selected_Balance_Sheet_2

Note 6 - Selected Balance Sheet Data (Details) (USD $)	3 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Disclosure Text Block Supplement [Abstract]	'	'
Available-for-sale Securities, Weighted Remaining Contractual Maturity	'1 year 113 days	'1 year 131 days
Allowance for Doubtful Other Receivables, Current	$1.80	$1.40

Note_6_Selected_Balance_Sheet_3

Note 6 - Selected Balance Sheet Data (Details) - Investments in Marketable Securities (USD $)	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$139,296	$126,576
Gross Unrealized Gains	3,642	3,417
Gross Unrealized Losses	-18	-23
Fair Value	142,920	129,970
US Treasury and Government [Member] | Short-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	53,089	77,823
Gross Unrealized Gains	41	48
Gross Unrealized Losses	'	-1
Fair Value	53,130	77,870
US Treasury and Government [Member] | Long-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Fair Value	53,130	77,870
Corporate Debt Securities [Member] | Short-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	85,387	47,933
Gross Unrealized Gains	1,254	1,068
Gross Unrealized Losses	-18	-20
Fair Value	86,623	48,981
Auction Rate Securities [Member] | Long-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	820	820
Gross Unrealized Gains	2,347	2,301
Gross Unrealized Losses	'	-2
Fair Value	3,167	3,119
Short-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	138,476	125,756
Gross Unrealized Gains	1,295	1,116
Gross Unrealized Losses	-18	-21
Fair Value	139,753	126,851
Long-term Investments [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	820	820
Gross Unrealized Gains	2,347	2,301
Gross Unrealized Losses	'	-2
Fair Value	$3,167	$3,119

Note_6_Selected_Balance_Sheet_4

Note 6 - Selected Balance Sheet Data (Details) - Amortized Cost and Fair Value of Investments (USD $)	Mar. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost and Fair Value of Investments [Abstract]	'
Due in less than 1 year	$49,988
Due in less than 1 year	50,073
Due within 1-2 years	57,163
Due within 1-2 years	57,300
Due within 2-5 years	30,992
Due within 2-5 years	31,048
Due after 5 years	1,153
Due after 5 years	4,499
Total	139,296
Total	$142,920

Note_6_Selected_Balance_Sheet_5

Note 6 - Selected Balance Sheet Data (Details) - Inventories (USD $)	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventories [Abstract]	'	'
Raw materials	$3,265	$4,530
Work in process	18,779	14,144
Finished goods	14,261	18,546
	$36,305	$37,220

Note_6_Selected_Balance_Sheet_6

Note 6 - Selected Balance Sheet Data (Details) - Activity for Goodwill (USD $)	3 Months Ended		12 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2011	Dec. 31, 2012	Jun. 01, 2012	Dec. 31, 2012	Aug. 24, 2012
			Anue Systems, Inc. [Member]	Anue Systems, Inc. [Member]	BreakingPoint Systems, Inc. [Member]	BreakingPoint Systems, Inc. [Member]
Goodwill [Line Items]	'	'	'	'	'	'
Goodwill	$260,457	$66,429	'	$91,376	'	$102,652
Adjustments	0	'	'	'	'	'
Acquisition	'	'	91,376	'	102,652	'
Goodwill	$260,457	$66,429	'	$91,376	'	$102,652

Note_6_Selected_Balance_Sheet_7

Note 6 - Selected Balance Sheet Data (Details) - Purchased Intangible Assets (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Other intangible assets:	'	'
Gross	$252,618	$252,383
Accumulated Amortization	-105,519	-95,380
Net	147,099	157,003
Technology-Based Intangible Assets [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'5 years 146 days	'5 years 146 days
Gross	141,215	141,215
Accumulated Amortization	-72,222	-66,704
Net	68,993	74,511
Customer Relationships [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'6 years	'6 years
Gross	70,376	70,376
Accumulated Amortization	-21,179	-18,289
Net	49,197	52,087
Service Agreements [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'5 years 255 days	'5 years 255 days
Gross	22,700	22,700
Accumulated Amortization	-6,268	-5,272
Net	16,432	17,428
Noncompete Agreements [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'4 years 73 days	'4 years 73 days
Gross	5,700	5,700
Accumulated Amortization	-1,864	-1,520
Net	3,836	4,180
Trademarks [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'5 years 109 days	'5 years 109 days
Gross	8,976	8,976
Accumulated Amortization	-2,674	-2,333
Net	6,302	6,643
Other Intangible Assets [Member]	'	'
Other intangible assets:	'	'
Weighted Average Useful Life	'3 years 328 days	'3 years 292 days
Gross	3,651	3,416
Accumulated Amortization	-1,312	-1,262
Net	$2,339	$2,154

Note_6_Selected_Balance_Sheet_8

Note 6 - Selected Balance Sheet Data (Details) - Estimated Future Amortization Expense of Purchased Intangible Assets (USD $)	Mar. 31, 2013
In Thousands, unless otherwise specified
Estimated Future Amortization Expense of Purchased Intangible Assets [Abstract]	'
2013	$29,674
2014	33,961
2015	29,277
2016	25,935
2017	18,907
Thereafter	9,345
	$147,099

Note_7_Shareholders_Equity_Det

Note 7 - Shareholders' Equity (Details) (USD $)	3 Months Ended
	Mar. 31, 2013
Stockholders' Equity Note [Abstract]	'
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments, Net of Tax	$166,000
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$105,000

Note_8_Earnings_Per_Share_Deta

Note 8 - Earnings Per Share (Details)	3 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Convertible Debt Securities [Member]	'	'
Note 8 - Earnings Per Share (Details) [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	10.3	10.3
Stock Opions and Other Share Based Awards [Member]	'	'
Note 8 - Earnings Per Share (Details) [Line Items]	'	'
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	1.3	1.5

Note_8_Earnings_Per_Share_Deta1

Note 8 - Earnings Per Share (Details) - Computation of Basic and Diluted Earnings Per Share (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Computation of Basic and Diluted Earnings Per Share [Abstract]	'	'
Net income (in Dollars)	$7,820	$5,167
Weighted average common shares outstanding	74,718	70,580
Basic earnings per share (in Dollars per share)	$0.10	$0.07
Net income used for diluted earnings per share (in Dollars)	$7,820	$5,167
Stock options and other share-based awards	2,201	2,374
Dilutive potential common shares	76,919	72,954
Diluted earnings per share (in Dollars per share)	$0.10	$0.07

Note_9_Concentrations_Details

Note 9 - Concentrations (Details)	Mar. 31, 2013
Risks and Uncertainties [Abstract]	'
Revenue Concentration Benchmark	10.00%

Note_9_Concentrations_Details_

Note 9 - Concentrations (Details) - Revenue Concentrations (Sales Revenue, Goods, Net [Member])	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Customer A [Member] | Customer Concentration Risk [Member]	'	'
Concentration Risk [Line Items]	'	'
Percentage of revenue	18.60%	'	[1]
Customer B [Member] | Customer Concentration Risk [Member]	'	'
Concentration Risk [Line Items]	'	'
Percentage of revenue	11.50%	17.10%
Geographic Concentration Risk [Member] | International [Member]	'	'
Concentration Risk [Line Items]	'	'
Percentage of revenue	37.80%	49.10%
Geographic Concentration Risk [Member] | JAPAN	'	'
Concentration Risk [Line Items]	'	'
Percentage of revenue	12.40%	14.00%
[1]	Less than 10%

Note_9_Concentrations_Details_1

Note 9 - Concentrations (Details) - Receivable Concentrations (Customer B [Member], Customer Concentration Risk [Member], Accounts Receivable [Member])	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Customer B [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]	'	'
Concentration Risk [Line Items]	'	'
Customer B	11.50%	'	[1]
[1]	Less than 10%

Note_10_Fair_Value_Measurement2

Note 10 - Fair Value Measurements (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Note 10 - Fair Value Measurements (Details) [Line Items]	'	'
Available-for-sale Securities	$142,920	$129,970
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member]	'	'
Note 10 - Fair Value Measurements (Details) [Line Items]	'	'
Available-for-sale Securities	3,167	3,119
Auction Rate Securities [Member] | Long-term Investments [Member]	'	'
Note 10 - Fair Value Measurements (Details) [Line Items]	'	'
Available-for-sale Securities	3,167	3,119
Long-term Investments [Member]	'	'
Note 10 - Fair Value Measurements (Details) [Line Items]	'	'
Available-for-sale Securities	$3,167	$3,119

Note_10_Fair_Value_Measurement3

Note 10 - Fair Value Measurements (Details) - Financial Assets Carried at Fair Value (USD $)	Mar. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Short-term investments:	'	'
Investments	$142,920	$129,970
Total financial assets	162,070	130,155
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Equivalents [Member]	'	'
Cash equivalents:	'	'
Cash equivalents	156	185
Money Market Funds [Member] | Cash Equivalents [Member]	'	'
Cash equivalents:	'	'
Cash equivalents	156	185
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Equivalents [Member]	'	'
Cash equivalents:	'	'
Cash equivalents	18,994	'
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	86,623	48,981
Corporate Debt Securities [Member] | Cash Equivalents [Member]	'	'
Cash equivalents:	'	'
Cash equivalents	18,994	'
Corporate Debt Securities [Member] | Short-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	86,623	48,981
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	53,130	77,870
US Treasury and Government [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	53,130	77,870
US Treasury and Government [Member] | Short-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	53,130	77,870
Auction Rate Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	3,167	3,119
Auction Rate Securities [Member] | Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	3,167	3,119
Fair Value, Inputs, Level 1 [Member]	'	'
Short-term investments:	'	'
Total financial assets	156	185
Fair Value, Inputs, Level 2 [Member]	'	'
Short-term investments:	'	'
Total financial assets	158,747	126,851
Fair Value, Inputs, Level 3 [Member]	'	'
Short-term investments:	'	'
Total financial assets	3,167	3,119
Long-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	3,167	3,119
Short-term Investments [Member]	'	'
Short-term investments:	'	'
Investments	$139,753	$126,851

Note_10_Fair_Value_Measurement4

Note 10 - Fair Value Measurements (Details) - Summary of Activity for Auction Rate Securities (Auction Rate Securities [Member], USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2013	Mar. 31, 2012
Auction Rate Securities [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Beginning balance	$3,119	$2,774
Unrealized gain recorded in other comprehensive income	48	180
Ending balance	$3,167	$2,954

Note_11_Commitments_and_Contin1

Note 11 - Commitments and Contingencies (Details) (USD $)	1 Months Ended	3 Months Ended
In Millions, unless otherwise specified	Jan. 31, 2013	Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'	'
Litigation Settlement, Amount	$1.20	'
Proceeds from Legal Settlements	'	$1.20

Note_12_Income_Taxes_Details

Note 12 - Income Taxes (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Note 12 - Income Taxes (Details) [Line Items]	'	'	'
Deferred Tax Assets, Net of Valuation Allowance, Current	$24,000,000	'	$24,200,000
Income Tax Expense (Benefit)	-788,000	1,445,000	'
Retroactive Renewal of the 2012 Federal R&D Tax Credit [Member]	'	'	'
Note 12 - Income Taxes (Details) [Line Items]	'	'	'
Income Tax Expense (Benefit)	($2,000,000)	'	'

Note_13_Restatements_Details

Note 13 - Restatements (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Note 13 - Restatements (Details) [Line Items]	'	'
Income Tax Expense (Benefit)	($788,000)	$1,445,000
Scenario, Adjustment [Member] | Out-of-period Adjustment [Member]	'	'
Note 13 - Restatements (Details) [Line Items]	'	'
Income Tax Expense (Benefit)	-639,000	'
Scenario, Adjustment [Member]	'	'
Note 13 - Restatements (Details) [Line Items]	'	'
Income Tax Expense (Benefit)	($1,039,000)	$230,000

Note_13_Restatements_Details_R

Note 13 - Restatements (Details) - Restated Financial Statements (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Prepaid expenses and other current assets	$46,357,000	'	$42,942,000
Total current assets	387,605,000	'	358,044,000
Other assets	13,623,000	'	11,863,000
Total assets	841,156,000	'	819,249,000
Deferred revenues - current	66,603,000	'	66,096,000
Total current liabilities	123,256,000	'	130,735,000
Other liabilities	36,984,000	'	32,321,000
Total liabilities	370,842,000	'	371,751,000
Retained earnings	125,116,000	'	117,296,000
Total shareholders’ equity	470,314,000	'	447,498,000
Total liabilities and shareholders’ equity	841,156,000	'	819,249,000
Revenues:	'	'	'
Products	95,511,000	69,607,000	'
Services	25,948,000	17,051,000	'
Total revenues	121,459,000	86,658,000	'
Income from operations	8,768,000	8,302,000	'
Income before income taxes	7,032,000	6,612,000	'
Income tax expense	-788,000	1,445,000	'
Net income	7,820,000	5,167,000	'
Deferred Income Taxes	-1,813,000	-317,000	'
Prepaid Expenses and Other Current Assets	-3,954,000	60,000	'
Other Assets	1,739,000	'	'
Deferred Revenues	2,414,000	4,881,000	'
Other Liabilities	3,031,000	4,619,000	'
Products	'	'	'
Comprehensive Income	7,641,000	5,954,000	'
Earnings per share:	'	'	'
Basic (in Dollars per share)	$0.10	$0.07	'
Diluted (in Dollars per share)	$0.10	$0.07	'
Scenario, Previously Reported [Member]	'	'	'
Prepaid expenses and other current assets	43,790,000	'	'
Total current assets	385,038,000	'	'
Other assets	11,814,000	'	'
Total assets	836,780,000	'	'
Deferred revenues - current	65,280,000	'	'
Total current liabilities	121,933,000	'	'
Other liabilities	33,646,000	'	'
Total liabilities	366,181,000	'	'
Retained earnings	125,401,000	'	'
Total shareholders’ equity	470,599,000	'	'
Total liabilities and shareholders’ equity	836,780,000	'	'
Revenues:	'	'	'
Products	96,636,000	69,043,000	'
Services	26,147,000	16,600,000	'
Total revenues	122,783,000	85,643,000	'
Income from operations	10,092,000	7,287,000	'
Income before income taxes	8,356,000	5,597,000	'
Income tax expense	251,000	1,215,000	'
Net income	8,105,000	4,382,000	'
Deferred Income Taxes	-1,561,000	'	'
Prepaid Expenses and Other Current Assets	-1,387,000	'	'
Other Assets	48,000	'	'
Deferred Revenues	1,091,000	5,896,000	'
Other Liabilities	2,941,000	4,389,000	'
Products	'	'	'
Comprehensive Income	7,927,000	5,169,000	'
Earnings per share:	'	'	'
Basic (in Dollars per share)	$0.11	$0.06	'
Diluted (in Dollars per share)	$0.11	$0.06	'
Scenario, Adjustment [Member] | Products Revenues [Member] | Implied Arrangement Error [Member]	'	'	'
Products	'	'	'
Corrected amount	'	564,000	'
Scenario, Adjustment [Member] | Services Revenues [Member] | Implied Arrangement Error [Member]	'	'	'
Products	'	'	'
Corrected amount	'	-237,000	'
Scenario, Adjustment [Member] | Services Revenues [Member] | Accounting Practice Error [Member]	'	'	'
Products	'	'	'
Corrected amount	'	688,000	'
Scenario, Adjustment [Member]	'	'	'
Prepaid expenses and other current assets	2,567,000	'	'
Total current assets	2,567,000	'	'
Other assets	1,809,000	'	'
Total assets	4,376,000	'	'
Deferred revenues - current	1,323,000	'	'
Total current liabilities	1,323,000	'	'
Other liabilities	3,338,000	'	'
Total liabilities	4,661,000	'	'
Retained earnings	-285,000	'	'
Total shareholders’ equity	-285,000	'	'
Total liabilities and shareholders’ equity	4,376,000	'	'
Revenues:	'	'	'
Products	-1,125,000	564,000	'
Services	-199,000	451,000	'
Total revenues	-1,324,000	1,015,000	'
Income from operations	-1,324,000	1,015,000	'
Income before income taxes	-1,324,000	1,015,000	'
Income tax expense	-1,039,000	230,000	'
Net income	-285,000	785,000	'
Deferred Income Taxes	-252,000	'	'
Prepaid Expenses and Other Current Assets	-2,567,000	'	'
Other Assets	1,691,000	'	'
Deferred Revenues	1,323,000	-1,015,000	'
Other Liabilities	90,000	230,000	'
Products	'	'	'
Comprehensive Income	($286,000)	$785,000	'
Earnings per share:	'	'	'
Basic (in Dollars per share)	($0.01)	$0.01	'
Diluted (in Dollars per share)	($0.01)	$0.01	'