LifeLock (LOCK) 10-Q 31 Jul 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 25, 2014
Document And Entity Information [Line Items]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Jun-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q2	'
Trading Symbol	'LOCK	'
Entity Registrant Name	'LifeLock, Inc.	'
Entity Central Index Key	'0001383871	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	92,775,848

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$166,650	$123,911
Marketable securities	49,385	48,688
Trade and other receivables, net	12,087	10,906
Deferred tax assets, net	18,585	13,117
Prepaid expenses and other current assets	8,426	6,961
Total current assets	255,133	203,583
Property and equipment, net	20,604	16,504
Goodwill	159,342	159,342
Intangible assets, net	42,751	47,213
Deferred tax assets, net – noncurrent	34,796	34,796
Other non-current assets	1,307	1,812
Total assets	513,933	463,250
Current liabilities:	'	'
Accounts payable	4,748	2,422
Accrued expenses and other liabilities	42,638	34,926
Deferred revenue	148,817	119,106
Total current liabilities	196,203	156,454
Other non-current liabilities	5,927	4,640
Total liabilities	202,130	161,094
Commitments and contingencies	'	'
Stockholders’ equity:	'	'
Common stock, $0.001 par value, 300,000,000 authorized at June 30, 2014 and December 31, 2013; 92,610,621 and 91,441,771 shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	92	91
Preferred stock, $0.001 par value, 10,000,000 shares authorized and no shares issued and outstanding at June 30, 2014 and December 31, 2013, respectively	'	'
Additional paid-in capital	487,240	469,636
Accumulated other comprehensive loss	-6	-18
Accumulated deficit	-175,523	-167,553
Total stockholders’ equity	311,803	302,156
Total liabilities and stockholders’ equity	$513,933	$463,250

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
Common stock par value	$0.00	$0.00
Common stock shares authorized	300,000,000	300,000,000
Common stock shares issued	92,610,621	91,441,771
Common stock shares outstanding	92,610,621	91,441,771
Preferred stock par value	$0.00	$0.00
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock shares issued	'	'
Preferred stock shares outstanding	'	'

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:	'	'	'	'
Consumer revenue	$109,338	$82,574	$210,333	$157,667
Enterprise revenue	6,375	6,946	12,966	13,947
Total revenue	115,713	89,520	223,299	171,614
Cost of services	29,536	25,227	59,603	49,031
Gross profit	86,177	64,293	163,696	122,583
Costs and expenses:	'	'	'	'
Sales and marketing	58,774	43,248	115,621	85,041
Technology and development	13,524	10,370	26,672	19,394
General and administrative	16,329	10,900	30,301	20,323
Amortization of acquired intangible assets	2,231	1,966	4,462	3,932
Total costs and expenses	90,858	66,484	177,056	128,690
Loss from operations	-4,681	-2,191	-13,360	-6,107
Other income (expense):	'	'	'	'
Interest expense	-88	-79	-175	-146
Interest income	56	26	116	46
Other	-6	'	-17	-4
Total other expense	-38	-53	-76	-104
Loss before provision for income taxes	-4,719	-2,244	-13,436	-6,211
Income tax benefit	-1,919	-179	-5,467	-29
Net loss	($2,800)	($2,065)	($7,969)	($6,182)
Net loss per share:	'	'	'	'
Basic	($0.03)	($0.02)	($0.09)	($0.07)
Diluted	($0.03)	($0.02)	($0.09)	($0.07)
Weighted-average common shares outstanding used in computing net loss per share:	'	'	'	'
Basic	92,471	87,533	92,189	87,089
Diluted	92,471	87,533	92,189	87,089

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net loss	($2,800)	($2,065)	($7,969)	($6,182)
Other comprehensive gain, net of tax	'	'	'	'
Unrealized gain on marketable securities	4	'	12	'
Comprehensive loss	($2,796)	($2,065)	($7,957)	($6,182)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013
Operating activities	'	'
Net loss	($7,969)	($6,182)
Adjustments to reconcile net loss to net cash provided by operating activities:	'	'
Depreciation and amortization	8,165	6,360
Share-based compensation	12,521	6,261
Provision for doubtful accounts	300	95
Amortization of premium on marketable securities	732	'
Deferred income tax benefit	-5,468	-212
Other	2	4
Changes in operating assets and liabilities:	'	'
Trade and other receivables	-2,189	-3,244
Prepaid expenses and other current assets	-1,465	-470
Other non-current assets	505	432
Accounts payable	2,052	-134
Accrued expenses and other liabilities	7,828	3,179
Deferred revenue	29,711	25,089
Other non-current liabilities	1,288	2,408
Net cash provided by operating activities	46,013	33,586
Investing activities	'	'
Acquisition of property and equipment	-7,662	-3,652
Purchase of marketable securities	-19,662	'
Maturities of marketable securities	18,990	'
Net cash used in investing activities	-8,334	-3,652
Financing activities	'	'
Proceeds from share-based compensation plans	5,501	5,753
Payments for employee tax withholdings related to restricted stock	-441	'
Payments for debt issuance costs	'	-440
Net cash provided by financing activities	5,060	5,313
Net increase in cash and cash equivalents	42,739	35,247
Cash and cash equivalents at beginning of period	123,911	134,197
Cash and cash equivalents at end of period	$166,650	$169,444

Description_of_Business_and_Ba

Description of Business and Basis of Presentation	6 Months Ended
	Jun. 30, 2014
Description of Business and Basis of Presentation	'
	1. Description of Business and Basis of Presentation
	We provide proactive identity theft protection services to our consumer subscribers, whom we refer to as our members, on an annual or monthly subscription basis. We also provide fraud and risk solutions to our enterprise customers.
	We were incorporated in Delaware on April 12, 2005 and are headquartered in Tempe, Arizona. On March 14, 2012, we acquired ID Analytics, Inc. and its wholly owned subsidiary IDA, Inc., collectively, ID Analytics, each of which is incorporated in Delaware.  On December 11, 2013, we acquired Lemon, Inc., or Lemon, which is incorporated in Delaware.
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States, or U.S. GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or SEC, regarding interim financial reporting. Certain information and note disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
	The condensed consolidated balance sheet as of December 31, 2013 included herein was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by U.S. GAAP.
	The accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the entire year ending December 31, 2014 or any future period.
	Basis of Consolidation
	The condensed consolidated financial statements include our accounts and those of our wholly owned subsidiaries. We eliminate all intercompany balances and transactions, including intercompany profits, and unrealized gains and losses in consolidation.
	Use of Estimates
	The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires us to make certain estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. We base our estimates on historical experience, current business factors, and various other assumptions that we believe are necessary to consider in forming a basis for making judgments about the carrying values of assets and liabilities, the recorded amounts of revenue and expenses, and the disclosure of contingent assets and liabilities.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2014
Summary of Significant Accounting Policies	'
	2. Summary of Significant Accounting Policies
	Significant Accounting Policies
	There have been no material changes to our significant accounting policies as compared to the significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
	Recently Issued Accounting Standards
	In April 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update (ASU) No. 2014-08, Reporting Discontinued Operations and Disclosures of Components of an Entity, which changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements.  The updated guidance defines discontinued operations as a disposal of a component or group of components that is disposed of or is classified as held for sale and represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results and expands the disclosure requirements for discontinued operations and adds new disclosures for individually significant dispositions that do not qualify as discontinued operations.  ASU No. 2014-08 is effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2014.  ASU No. 2014-08 would be applied to any future applicable transaction.
	In May 2014, the FASB issued ASU 2014-09, which provides guidance for revenue recognition. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under today’s guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. This guidance will be effective for us in the first quarter of our fiscal year ending December 31, 2017. Early adoption is not permitted. We are currently in the process of evaluating the impact of adoption of this ASU on our consolidated financial statements.

Business_Combinations

Business Combinations	6 Months Ended
	Jun. 30, 2014
Business Combinations	'
	3. Business Combinations
	Acquisition of Lemon
	On December 11, 2013, we acquired Lemon, a mobile wallet innovator. In connection with this acquisition, we launched our new LifeLock mobile application. The aggregate purchase price consisted of approximately $42,369 of cash paid at the closing (net of cash acquired of $3,315).  We preliminarily allocated the total purchase consideration to the assets acquired and liabilities assumed at their estimated fair values as of the date of acquisition, as determined by management, and, with respect to identifiable intangible assets, by management with the assistance of a valuation provided by a third-party valuation firm. We recorded the excess of the purchase price over the amounts allocated to assets acquired and liabilities assumed as goodwill in our consumer segment.
	The allocation of the purchase price of the acquired assets and liabilities as of December 31, 2013 was based on provisional measurements of fair value as determined by management.  Subsequent to the filing of our Annual Report on Form 10-K for the fiscal year ended December 31, 2013, we determined that approximately $7,894 and $7,991 of Lemon’s federal and state net operating loss carryforwards, respectively, would expire as a result of limitations under Section 382 of the Internal Revenue Code.  As such, we reduced deferred tax assets, net – noncurrent by $3,222, increasing goodwill.  This adjustment has been reflected in the December 31, 2013 balances of deferred tax assets, net – noncurrent and goodwill in the accompanying condensed consolidated balance sheets.
	We accounted for this acquisition using the acquisition method in accordance with Accounting Standards Codification, or ASC, 805, Business Combinations. Accordingly, we allocated the purchase price of the acquired assets and liabilities based on their estimated fair values as of the acquisition date as summarized in the following table:
	Net assets assumed	$	3,184
	Deferred tax assets, net - noncurrent		8,706
	Intangible assets acquired		3,880
	Goodwill		29,914
	Total purchase price consideration	$	45,684

Marketable_Securities

Marketable Securities	6 Months Ended
	Jun. 30, 2014
Marketable Securities	'
	4. Marketable Securities
	The following is a summary of marketable securities designated as available-for-sale as of June 30, 2014:
				Gross		Gross
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Corporate bonds	$	35,914	$	—	$	(17	)	$	35,897
	Municipal bonds		12,989		2		(1	)		12,990
	Certificates of deposit		498		—		—			498
	Total marketable securities	$	49,401	$	2	$	(18	)	$	49,385
	All marketable securities are classified as current regardless of contractual maturity dates because we consider such investments to represent cash available for current operations.
	As of June 30, 2014, we did not consider any of our marketable securities to be other-than-temporarily impaired. When evaluating our investments for other-than-temporary impairment, we review factors such as the length of time and extent to which fair value has been below its cost basis, the financial condition of the issuer, our ability and intent to hold the security and whether it is more likely than not that we will be required to sell the investment before recovery of its cost basis.
	The following is a summary of amortized cost and estimated fair value of marketable securities as of June 30, 2014, by maturity:
				Gross		Gross
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Due in one year or less	$	48,132	$	2	$	(18	)	$	48,116
	Due after one year		1,269		—		—			1,269
	Total marketable securities	$	49,401	$	2	$	(18	)	$	49,385
	The following is a summary of marketable securities designated as available-for-sale as of December 31, 2013:
				Gross		Gross
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Corporate bonds	$	37,399	$	1	$	(29	)	$	37,371
	Municipal bonds		10,820		2		(3	)		10,819
	Certificates of deposit		498		-		-			498
	Total marketable securities	$	48,717	$	3	$	(32	)	$	48,688
	The following is a summary of amortized cost and estimated fair value of marketable securities as of December 31, 2013, by maturity:
				Gross		Gross
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Due in one year or less	$	47,398	$	3	$	(32	)	$	47,369
	Due after one year		1,319		-		-			1,319
	Total marketable securities	$	48,717	$	3	$	(32	)	$	48,688

Stockholders_Equity

Stockholders' Equity	6 Months Ended
	Jun. 30, 2014
Stockholders' Equity	'
	5. Stockholders’ Equity
	Share-Based Compensation
	We issue share-based awards to our employees in the form of stock options, restricted stock units, and restricted stock. We also have an employee stock purchase plan. The following table summarizes the components of share-based compensation expense included in our condensed consolidated statements of operations for the three- and six-month periods ended June 30:
		For the Three Months Ended						For the Six Months Ended
		June 30,						June 30,
		2014			2013			2014		2013
		(in thousands)						(in thousands)
	Cost of services	$	489		$	206		$	832	$	412
	Sales and marketing		1,309			386			2,203		719
	Technology and development		1,942			824			3,915		1,339
	General and administrative		3,306			2,121			5,571		3,791
	Total share-based compensation	$	7,046		$	3,537		$	12,521	$	6,261
	Unrecognized share-based compensation expenses totaled $81,947 as of June 30, 2014, which we expect to recognize over a weighted-average time period of 3.2 years.
	Stock Warrants
	As of June 30, 2014, we had the following warrants to purchase common stock outstanding:
	Expiration Date		Shares			Exercise
						Price
	October 3, 2014			2,334,044			0.7
	December 19, 2014			166,666			4.5

Fair_Value_Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2014
Fair Value Measurements	'
	6. Fair Value Measurements
	As of June 30, 2014 and December 31, 2013, the fair value of our financial assets was as follows:
		Level 1		Level 2		Level 3		Total
	30-Jun-14
	Assets:
	Commercial paper (1)	$	45,156	$	—	$	—	$	45,156
	Money market funds (1)		60,054		—		—		60,054
	Corporate bonds (2)		—		35,897		—		35,897
	Municipal bonds (3)		—		13,175		—		13,175
	Certificates of deposit (2)		—		498		—		498
	Total assets measured at fair value	$	105,210	$	49,570	$	—	$	154,780
	31-Dec-13
	Assets:
	Commercial paper (1)	$	—	$	45,110	$	—	$	45,110
	Money market funds (1)		911		—		—		911
	Corporate bonds (2)		—		37,371		—		37,371
	Municipal bonds (2)		—		10,819		—		10,819
	Certificates of deposit (2)		—		498		—		498
	Total assets measured at fair value	$	911	$	93,798	$	—	$	94,709
	-1	Classified in cash and cash equivalents
	-2	Classified in marketable securities
	-3	Includes a short-term, highly rated, highly liquid investment that is included in cash and cash equivalents as the original maturity date was less than three months at the time of purchase.  Municipal bond investments with original maturity dates greater than three months at the time of purchase are classified in marketable securities.
	The fair values of our cash equivalents and available-for-sale securities included in the Level 1 and Level 2 categories are obtained from an independent pricing service, which uses a model driven valuation technique using observable market data or inputs corroborated by observable market data.

Net_Loss_Per_Share

Net Loss Per Share	6 Months Ended
	Jun. 30, 2014
Net Loss Per Share	'
	7. Net Loss Per Share
	The following table sets forth the computation of basic and diluted net loss per share for the three- and six-month periods ended June 30:
		For the Three Months Ended						For the Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Net loss	$	(2,800	)	$	(2,065	)	$	(7,969	)	$	(6,182	)
	Denominator (basic and diluted):
	Weighted average common shares outstanding		92,471,009			87,532,810			92,188,591			87,088,642
	Net loss per share:
	Basic	$	(0.03	)	$	(0.02	)	$	(0.09	)	$	(0.07	)
	Diluted	$	(0.03	)	$	(0.02	)	$	(0.09	)	$	(0.07	)
	For the three- and six-month periods ended June 30, 2014 and 2013, potentially dilutive securities are not included in the calculation of diluted loss per share as their impact would be anti-dilutive. The following weighted-average number of outstanding stock options, restricted stock units and restricted stock awards, common equivalent shares from stock warrants, and shares purchased under our Employee Stock Purchase Plan, or ESPP, were excluded from the computation of diluted net loss per share for the three- and six-month periods ended June 30:
		For the Three Months Ended						For the Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Stock options outstanding		3,021,735			5,016,362			3,714,028			5,276,932
	Restricted stock units and awards		116,119			62,299			218,577			64,436
	Common equivalent shares from stock warrants		2,326,302			2,262,543			2,356,681			2,292,039
	Shares purchased under ESPP		7,063			—			29,190			—
			5,471,219			7,341,204			6,318,476			7,633,407

Segment_Reporting

Segment Reporting	6 Months Ended
	Jun. 30, 2014
Segment Reporting	'
	8. Segment Reporting
	Following our acquisition of ID Analytics in the first quarter of 2012, we began operating our business and reviewing and assessing our operating performance using two reportable segments: our consumer segment and our enterprise segment. In our consumer segment, we offer proactive identity theft protection services to our members on an annual or monthly subscription basis. In our enterprise segment, we offer fraud and risk solutions to our enterprise customers.
	Financial information about our segments during the three-month period ended June 30, 2014 and as of June 30, 2014 was as follows:
		Consumer			Enterprise			Eliminations			Total
	Revenue:
	External customers	$	109,338		$	6,375		$	—		$	115,713
	Intersegment revenue		—			1,635			(1,635	)		—
	Loss from operations		(278	)		(4,403	)		—			(4,681	)
	Goodwill		99,805			59,537			—			159,342
	Total assets		405,617			108,878			(562	)		513,933
	Loss from operations in our consumer and enterprise segments for the three-month period ended June 30, 2014 includes amortization of acquired intangible assets of $265 and $1,966, respectively.
	Financial information about our segments during the six-month period ended June 30, 2014 was as follows:
		Consumer			Enterprise			Eliminations			Total
	Revenue:
	External customers	$	210,333		$	12,966		$	—		$	223,299
	Intersegment revenue		—			3,149			(3,149	)		—
	Loss from operations		(4,801	)		(8,559	)		—			(13,360	)
	Loss from operations in our consumer and enterprise segments for the six-month period ended June 30, 2014 includes amortization of acquired intangible assets of $530 and $3,932, respectively.
	Financial information about our segments during the three-month period ended June 30, 2013 and as of December 31, 2013 was as follows:
		Consumer			Enterprise			Eliminations			Total
	Revenue:
	External customers	$	82,574		$	6,946		$	—		$	89,520
	Intersegment revenue		—			1,307			(1,307	)		—
	Income (loss) from operations		762			(2,953	)		—			(2,191	)
	Goodwill		99,805			59,537			—			159,342
	Total assets		349,394			114,337			(481	)		463,250
	Loss from operations in our enterprise segment for the three-month period ended June 30, 2013 includes amortization of acquired intangible assets of $1,966.
	Financial information about our segments during the six-month period ended June 30, 2013 was as follows:
		Consumer			Enterprise			Eliminations			Total
	Revenue:
	External customers	$	157,667		$	13,947		$	—		$	171,614
	Intersegment revenue		—			2,544			(2,544	)		—
	Income (loss) from operations		129			(6,236	)		—			(6,107	)
	Loss from operations in our enterprise segment for the six-month period ended June 30, 2013 includes amortization of acquired intangible assets of $3,932.
	We had no amortization of acquired intangible assets within our consumer segment for the three- and six-month periods ended June 30, 2013, as our consumer segment did not have acquired intangible assets until our purchase of Lemon in December 2013.
	We allocated goodwill between our segments by estimating the expected synergies to each segment.
	We derive all of our revenue from sales in the United States, and substantially all of our long-lived assets are located in the United States.

Income_Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2014
Income Taxes	'
	9. Income Taxes
	Income taxes for the interim periods presented have been included in the accompanying condensed consolidated financial statements on the basis of an estimated annual effective tax rate.  Based on an estimated annual effective tax rate and discrete items, the estimated income tax benefit from operations for the three- and six-month periods ended June 30, 2014 was approximately $1,919 and $5,467, respectively.  For the three- and six-month periods ended June 30, 2013, the estimated income tax benefit from operations was $179 and $29, respectively.  The determination of the interim period income tax provision utilizes the effective tax rate method, which requires us to estimate certain annualized components of the calculation of the income tax provision, including the annual effective tax rate by entity and jurisdiction.
	In the fourth quarter of 2013, in connection with the acquisition of Lemon and the preliminary purchase price allocation, we analyzed Lemon’s prior ownership changes, including the change which arose as a result of our acquisition of Lemon.  As a result of the preliminary analysis, we estimated that none of Lemon’s net operating loss carryforwards would expire as a result of limitations under Section 382 of the Internal Revenue Code.  Subsequent to the filing of our Annual Report on Form 10-K for the fiscal year ended December 31, 2013, we received responses from certain former shareholders who had held a 5% or greater ownership interest in Lemon prior to the acquisition and determined that due to the ownership changes of those former shareholders, approximately $7,894 and $7,991 of Lemon’s federal and state net operating loss carryforwards, respectively, will expire solely as a result of the Section 382 limitations. As such, we retrospectively adjusted our preliminary purchase price allocation to reflect this information.

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 2014
Contingencies	'
	10. Contingencies
	As part of our consumer services, we offer 24x7x365 member service support. If a member’s identity has been compromised, our member service team and remediation specialists will assist the member until the issue has been resolved. This includes our $1 million service guarantee, which is backed by an identity theft insurance policy, under which we will spend up to $1 million to cover certain third-party costs and expenses incurred in connection with the remediation, such as legal and investigatory fees. This insurance also covers certain out-of-pocket expenses, such as loss of income, replacement of fraudulent withdrawals, and costs associated with child and elderly care, travel, stolen purse/wallet, and replacement of documents. While we have reimbursed members for claims under this guarantee, the amounts in aggregate for the three- and six-month periods ended June 30, 2014 and 2013 were not material.
	In September 2012, Denise Richardson filed a complaint against our company and Todd Davis. Ms. Richardson claims that she was improperly classified as an independent contractor instead of an employee and that we breached the terms of an alleged employment agreement. Ms. Richardson claims she is entitled to equitable relief, compensatory damages, liquidated damages, statutory penalties, punitive damages, interest, costs, and attorneys’ fees. On March 31, 2014, our motion to dismiss was granted in part and denied in part with the court dismissing nine of the ten counts that were subject to the motion to dismiss, including the single count against Mr. Davis.  On April 23, 2014, Ms. Richardson filed an amended complaint against our company and Mr. Davis again claiming that she was improperly classified as an independent contractor instead of an employee and that we breached the terms of an alleged employment agreement. Ms. Richardson claims she is entitled to equitable relief, compensatory damages, liquidated damages, statutory penalties, punitive damages, interest, costs, and attorneys’ fees.  On April 29, 2014, Mr. Davis and we filed a motion to dismiss all but one of the counts in such amended complaint.   On June 11, 2014, Ms. Richardson filed a Notice of Voluntary Dismissal by which she voluntarily dismissed her ERISA claims against us, as well as her only claim against Mr. Davis.   With respect to the remaining claims that are the subject of our motion to dismiss, the motion is awaiting decision by the court.  The court has set a scheduling conference in the matter for August 18, 2014.
	On March 3, 2014, Dawn B. Bien, representing herself and seeking to represent a class of persons who acquired our securities from February 26, 2013 to February 19, 2014, inclusive, or the Class Period, filed a complaint in United States District Court for the District of Arizona against us, Todd Davis, and Chris Power.  We refer to this complaint as the Bien Complaint.  The Bien Complaint alleges that we and Messrs. Davis and Power, in violation of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934, as amended, or the Exchange Act,  disseminated materially false or misleading information, or failed to disclose material facts during the Class Period in connection with our business and our operational and compliance policies, including our and Mr. Davis’s compliance with the  Stipulated Final Judgment and Order for Permanent Injunction and Other Equitable Relief entered into in March 2010 with the Federal Trade Commission, or the FTC Order, wherein we settled allegations by the Federal Trade Commission challenging certain of our advertising and marketing.  The Bien Complaint also contends that as a result of alleged violations of governmental laws, regulations, and the FTC Order, our financial statements were materially false and misleading at all relevant times.  The Bien Complaint seeks certification as a class action, compensatory damages, and attorneys’ fees and costs. On March 10, 2014, Joseph F. Scesny, representing himself and seeking to represent a class of persons who acquired our securities during the Class Period filed a complaint in United States District Court for the District of Arizona against us, Todd Davis, and Chris Power.  We refer to this complaint as the Scesny Complaint. The Scesny Complaint is substantially similar to the Bien Complaint and seeks substantially similar relief. On June 16, 2014, the court consolidated the Scesny Complaint and the Bien Complaint into a single action captioned In re LifeLock, Inc. Securities Litigation.  The court also appointed a lead plaintiff and lead counsel.  Pursuant to the parties’ stipulation, and the order of the court dated July 2, 2014, a consolidated amended complaint is due to be filed no later than August 15, 2014.  We anticipate filing a motion to dismiss that complaint by September 15, 2014.
	On March 13, 2014, we received a request from the Federal Trade Commission, or the FTC, for documents and information related to our compliance with the FTC Order.   Prior to our receipt of the FTC’s request, we met with FTC Staff on January 17, 2014, at our request, to discuss issues regarding allegations that have been asserted in a whistleblower claim against us relating to our compliance with the FTC Order.  On March 13, 2014, we received a request from the FTC for documents and information related to our compliance with the FTC Order.   We are in the process of completing our response to the FTC’s March 13, 2014 request for information regarding our information security program and alert and notification processing, along with a subsequent request for clarification regarding certain information that we previously submitted.
	On March 20, 2014, Michael D. Peters filed a complaint in United States District Court for the District of Arizona against our company, Kim Jones, and Cristy Schaan.  Mr. Jones is not affiliated with us.  Ms. Schaan is our Chief Information Security Officer.  In his complaint, Mr. Peters alleges that we violated the whistleblower protection provisions of the Sarbanes-Oxley Act of 2002, or the Sarbanes-Oxley Act, and the Dodd-Frank Wall Street Reform and Consumer Protection Act, or the Dodd-Frank Act, by terminating Mr. Peters’ employment as a result of alleged disclosures that he made to us, and that Ms. Schaan defamed Mr. Peters.  Mr. Peters seeks from us two times his back pay, two times the value of certain stock options and bonus, moving expenses, damages for emotional harm and anxiety, damages for harm to reputation, litigation costs including attorneys’ fees, and interest, and seeks from Ms. Schaan actual damages, punitive damages, and interest.  On April 21, 2014, we filed an answer, affirmative defenses, and counterclaims, answering Mr. Peters’ claim under the Sarbanes-Oxley Act and asserting counterclaims against Mr. Peters for fraud, negligent misrepresentation, breach of contract, and unjust enrichment, based on our allegations that we were induced to hire Mr. Peters by his false statements and misrepresentations regarding his employment history and seeking to recover actual and consequential damages, punitive damages, attorneys’ fees, and the $15 signing bonus paid to Mr. Peters.  Mr. Peters answered our counterclaims on May 7, 2014.  On April 21, 2014, we also filed a motion to dismiss Mr. Peters’ claim under the Dodd-Frank Act.  On April 25, 2014, Ms. Schaan filed a motion to dismiss Mr. Peters’ claim against her.  On June 2, 2014, Mr. Peters filed a motion for judgment on the pleadings directed to our unjust enrichment counterclaim, one of the four counterclaims we brought against Mr. Peters.  All three of the motions are awaiting decision by the court.
	We are subject to other legal proceedings and claims that have arisen in the ordinary course of business. Although there can be no assurance as to the ultimate disposition of these matters and the proceedings disclosed above, we believe, based upon the information available at this time, that a material adverse outcome related to the matters is neither probable nor estimable.

Description_of_Business_and_Ba1

Description of Business and Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2014
Basis of Presentation	'
	Basis of Presentation
	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States, or U.S. GAAP, and applicable rules and regulations of the Securities and Exchange Commission, or SEC, regarding interim financial reporting. Certain information and note disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
	The condensed consolidated balance sheet as of December 31, 2013 included herein was derived from the audited financial statements as of that date, but does not include all disclosures including notes required by U.S. GAAP.
	The accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the entire year ending December 31, 2014 or any future period.
Basis of Consolidation	'
	Basis of Consolidation
	The condensed consolidated financial statements include our accounts and those of our wholly owned subsidiaries. We eliminate all intercompany balances and transactions, including intercompany profits, and unrealized gains and losses in consolidation.
Use of Estimates	'
	Use of Estimates
	The preparation of condensed consolidated financial statements in conformity with U.S. GAAP requires us to make certain estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. We base our estimates on historical experience, current business factors, and various other assumptions that we believe are necessary to consider in forming a basis for making judgments about the carrying values of assets and liabilities, the recorded amounts of revenue and expenses, and the disclosure of contingent assets and liabilities.
Significant Accounting Policies	'
	Significant Accounting Policies
	There have been no material changes to our significant accounting policies as compared to the significant accounting policies described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013.
Recently Issued Accounting Standards	'
	Recently Issued Accounting Standards
	In April 2014, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update (ASU) No. 2014-08, Reporting Discontinued Operations and Disclosures of Components of an Entity, which changes the criteria for determining which disposals can be presented as discontinued operations and modifies related disclosure requirements.  The updated guidance defines discontinued operations as a disposal of a component or group of components that is disposed of or is classified as held for sale and represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results and expands the disclosure requirements for discontinued operations and adds new disclosures for individually significant dispositions that do not qualify as discontinued operations.  ASU No. 2014-08 is effective for fiscal years, and interim reporting periods within those years, beginning after December 15, 2014.  ASU No. 2014-08 would be applied to any future applicable transaction.
	In May 2014, the FASB issued ASU 2014-09, which provides guidance for revenue recognition. The standard’s core principle is that a company will recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. In doing so, companies will need to use more judgment and make more estimates than under today’s guidance. These may include identifying performance obligations in the contract, estimating the amount of variable consideration to include in the transaction price and allocating the transaction price to each separate performance obligation. This guidance will be effective for us in the first quarter of our fiscal year ending December 31, 2017. Early adoption is not permitted. We are currently in the process of evaluating the impact of adoption of this ASU on our consolidated financial statements.

Business_Combinations_Tables

Business Combinations (Tables)	6 Months Ended
	Jun. 30, 2014
Schedule of Purchase Price of Acquired Assets and Liabilities Based on Estimated Fair Values	'
	We accounted for this acquisition using the acquisition method in accordance with Accounting Standards Codification, or ASC, 805, Business Combinations. Accordingly, we allocated the purchase price of the acquired assets and liabilities based on their estimated fair values as of the acquisition date as summarized in the following table:
	Net assets assumed	$	3,184
	Deferred tax assets, net - noncurrent		8,706
	Intangible assets acquired		3,880
	Goodwill		29,914
	Total purchase price consideration	$	45,684

Marketable_Securities_Tables

Marketable Securities (Tables)	6 Months Ended
	Jun. 30, 2014
Summary of Marketable Securities Designated as Available-for-Sale	'
	The following is a summary of marketable securities designated as available-for-sale as of June 30, 2014:
				Gross		Gross
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Corporate bonds	$	35,914	$	—	$	(17	)	$	35,897
	Municipal bonds		12,989		2		(1	)		12,990
	Certificates of deposit		498		—		—			498
	Total marketable securities	$	49,401	$	2	$	(18	)	$	49,385
	The following is a summary of marketable securities designated as available-for-sale as of December 31, 2013:
				Gross		Gross
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Corporate bonds	$	37,399	$	1	$	(29	)	$	37,371
	Municipal bonds		10,820		2		(3	)		10,819
	Certificates of deposit		498		-		-			498
	Total marketable securities	$	48,717	$	3	$	(32	)	$	48,688
Summary of Amortized Cost and Estimated Fair Value of Marketable Securities by Maturity	'
	The following is a summary of amortized cost and estimated fair value of marketable securities as of June 30, 2014, by maturity:
				Gross		Gross
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Due in one year or less	$	48,132	$	2	$	(18	)	$	48,116
	Due after one year		1,269		—		—			1,269
	Total marketable securities	$	49,401	$	2	$	(18	)	$	49,385
	The following is a summary of amortized cost and estimated fair value of marketable securities as of December 31, 2013, by maturity:
				Gross		Gross
		Amortized		Unrealized		Unrealized			Estimated
		Cost		Gains		Losses			Fair Value
	Due in one year or less	$	47,398	$	3	$	(32	)	$	47,369
	Due after one year		1,319		-		-			1,319
	Total marketable securities	$	48,717	$	3	$	(32	)	$	48,688

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	6 Months Ended
	Jun. 30, 2014
Summary of Components of Share-Based Compensation Expense	'
	We issue share-based awards to our employees in the form of stock options, restricted stock units, and restricted stock. We also have an employee stock purchase plan. The following table summarizes the components of share-based compensation expense included in our condensed consolidated statements of operations for the three- and six-month periods ended June 30:
		For the Three Months Ended						For the Six Months Ended
		June 30,						June 30,
		2014			2013			2014		2013
		(in thousands)						(in thousands)
	Cost of services	$	489		$	206		$	832	$	412
	Sales and marketing		1,309			386			2,203		719
	Technology and development		1,942			824			3,915		1,339
	General and administrative		3,306			2,121			5,571		3,791
	Total share-based compensation	$	7,046		$	3,537		$	12,521	$	6,261
Warrant Purchase	'
	As of June 30, 2014, we had the following warrants to purchase common stock outstanding:
	Expiration Date		Shares			Exercise
						Price
	October 3, 2014			2,334,044			0.7
	December 19, 2014			166,666			4.5

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value of Financial Assets and Liabilities	'
	As of June 30, 2014 and December 31, 2013, the fair value of our financial assets was as follows:
		Level 1		Level 2		Level 3		Total
	30-Jun-14
	Assets:
	Commercial paper (1)	$	45,156	$	—	$	—	$	45,156
	Money market funds (1)		60,054		—		—		60,054
	Corporate bonds (2)		—		35,897		—		35,897
	Municipal bonds (3)		—		13,175		—		13,175
	Certificates of deposit (2)		—		498		—		498
	Total assets measured at fair value	$	105,210	$	49,570	$	—	$	154,780
	31-Dec-13
	Assets:
	Commercial paper (1)	$	—	$	45,110	$	—	$	45,110
	Money market funds (1)		911		—		—		911
	Corporate bonds (2)		—		37,371		—		37,371
	Municipal bonds (2)		—		10,819		—		10,819
	Certificates of deposit (2)		—		498		—		498
	Total assets measured at fair value	$	911	$	93,798	$	—	$	94,709
	-1	Classified in cash and cash equivalents
	-2	Classified in marketable securities
	-3	Includes a short-term, highly rated, highly liquid investment that is included in cash and cash equivalents as the original maturity date was less than three months at the time of purchase.  Municipal bond investments with original maturity dates greater than three months at the time of purchase are classified in marketable securities.

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Basic and Diluted Net Loss Per Share Attributable to Common Stockholders	'
	The following table sets forth the computation of basic and diluted net loss per share for the three- and six-month periods ended June 30:
		For the Three Months Ended						For the Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Net loss	$	(2,800	)	$	(2,065	)	$	(7,969	)	$	(6,182	)
	Denominator (basic and diluted):
	Weighted average common shares outstanding		92,471,009			87,532,810			92,188,591			87,088,642
	Net loss per share:
	Basic	$	(0.03	)	$	(0.02	)	$	(0.09	)	$	(0.07	)
	Diluted	$	(0.03	)	$	(0.02	)	$	(0.09	)	$	(0.07	)
Stock Options, Restricted Stock Units and Awards, Common Equivalent Shares from Stock Warrants, and Shares Purchased Under our Employee Stock Purchase Plan, or Espp Excluded from Computation of Diluted Net Loss Per Share	'
	For the three- and six-month periods ended June 30, 2014 and 2013, potentially dilutive securities are not included in the calculation of diluted loss per share as their impact would be anti-dilutive. The following weighted-average number of outstanding stock options, restricted stock units and restricted stock awards, common equivalent shares from stock warrants, and shares purchased under our Employee Stock Purchase Plan, or ESPP, were excluded from the computation of diluted net loss per share for the three- and six-month periods ended June 30:
		For the Three Months Ended						For the Six Months Ended
		June 30,						June 30,
		2014			2013			2014			2013
	Stock options outstanding		3,021,735			5,016,362			3,714,028			5,276,932
	Restricted stock units and awards		116,119			62,299			218,577			64,436
	Common equivalent shares from stock warrants		2,326,302			2,262,543			2,356,681			2,292,039
	Shares purchased under ESPP		7,063			—			29,190			—
			5,471,219			7,341,204			6,318,476			7,633,407

Segment_Reporting_Tables

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2014
Financial Information of Segments	'
	Financial information about our segments during the three-month period ended June 30, 2014 and as of June 30, 2014 was as follows:
		Consumer			Enterprise			Eliminations			Total
	Revenue:
	External customers	$	109,338		$	6,375		$	—		$	115,713
	Intersegment revenue		—			1,635			(1,635	)		—
	Loss from operations		(278	)		(4,403	)		—			(4,681	)
	Goodwill		99,805			59,537			—			159,342
	Total assets		405,617			108,878			(562	)		513,933
	Financial information about our segments during the six-month period ended June 30, 2014 was as follows:
		Consumer			Enterprise			Eliminations			Total
	Revenue:
	External customers	$	210,333		$	12,966		$	—		$	223,299
	Intersegment revenue		—			3,149			(3,149	)		—
	Loss from operations		(4,801	)		(8,559	)		—			(13,360	)
	Financial information about our segments during the three-month period ended June 30, 2013 and as of December 31, 2013 was as follows:
		Consumer			Enterprise			Eliminations			Total
	Revenue:
	External customers	$	82,574		$	6,946		$	—		$	89,520
	Intersegment revenue		—			1,307			(1,307	)		—
	Income (loss) from operations		762			(2,953	)		—			(2,191	)
	Goodwill		99,805			59,537			—			159,342
	Total assets		349,394			114,337			(481	)		463,250
	Financial information about our segments during the six-month period ended June 30, 2013 was as follows:
		Consumer			Enterprise			Eliminations			Total
	Revenue:
	External customers	$	157,667		$	13,947		$	—		$	171,614
	Intersegment revenue		—			2,544			(2,544	)		—
	Income (loss) from operations		129			(6,236	)		—			(6,107	)

Description_of_Business_and_Ba2

Description of Business and Basis of Presentation - Additional Information (Detail)	6 Months Ended
	Jun. 30, 2014
Basis Of Presentation And Organization [Line Items]	'
Acquisition date of ID Analytics Inc	14-Mar-12

Business_Combinations_Addition

Business Combinations - Additional Information (Detail) (Lemon Inc, USD $)	0 Months Ended
In Thousands, unless otherwise specified	Dec. 11, 2013	Jun. 30, 2014
Business Acquisition [Line Items]	'	'
Cash paid for acquisition	$42,369	'
Purchase price net of cash acquired	3,315	'
Reduction of deferred tax assets, net - noncurrent by increasing goodwill	'	3,222
Federal	'	'
Business Acquisition [Line Items]	'	'
Net operating loss carryforwards	'	7,894
State	'	'
Business Acquisition [Line Items]	'	'
Net operating loss carryforwards	'	$7,991

Schedule_of_Purchase_Price_of_

Schedule of Purchase Price of Acquired Assets and Liabilities Based on Estimated Fair Values (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Business Acquisition [Line Items]	'	'
Goodwill	$159,342	$159,342
Lemon Inc	'	'
Business Acquisition [Line Items]	'	'
Net assets assumed	3,184	'
Deferred tax assets, net - noncurrent	8,706	'
Intangible assets acquired	3,880	'
Goodwill	29,914	'
Total purchase price consideration	$45,684	'

Summary_of_Marketable_Securiti

Summary of Marketable Securities Designated as Available-for-Sale (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Marketable Securities [Line Items]	'	'
Amortized Cost	$49,401	$48,717
Gross Unrealized Gains	2	3
Gross Unrealized Losses	-18	-32
Estimated Fair Value	49,385	48,688
Corporate bonds	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Amortized Cost	35,914	37,399
Gross Unrealized Gains	'	1
Gross Unrealized Losses	-17	-29
Estimated Fair Value	35,897	37,371
Municipal bonds	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Amortized Cost	12,989	10,820
Gross Unrealized Gains	2	2
Gross Unrealized Losses	-1	-3
Estimated Fair Value	12,990	10,819
Certificates of deposit	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Amortized Cost	498	498
Estimated Fair Value	$498	$498

Summary_of_Amortized_Cost_and_

Summary of Amortized Cost and Estimated Fair Value of Marketable Securities by Maturity (Detail) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Schedule Of Marketable Securities [Line Items]	'	'
Amortized Cost	$49,401	$48,717
Gross Unrealized Gains	2	3
Gross Unrealized Losses	-18	-32
Estimated Fair Value	49,385	48,688
Due in one year or less	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Amortized Cost	48,132	47,398
Gross Unrealized Gains	2	3
Gross Unrealized Losses	-18	-32
Estimated Fair Value	48,116	47,369
Due after one year	'	'
Schedule Of Marketable Securities [Line Items]	'	'
Amortized Cost	1,269	1,319
Estimated Fair Value	$1,269	$1,319

Summary_of_Components_of_Share

Summary of Components of Share-Based Compensation Expense (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total share-based compensation expense	$7,046	$3,537	$12,521	$6,261
Cost of services	'	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total share-based compensation expense	489	206	832	412
Sales and marketing	'	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total share-based compensation expense	1,309	386	2,203	719
Technology and development	'	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total share-based compensation expense	1,942	824	3,915	1,339
General and administrative	'	'	'	'
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]	'	'	'	'
Total share-based compensation expense	$3,306	$2,121	$5,571	$3,791

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014
Class Of Stock [Line Items]	'
Unrecognized share based compensation	$81,947
Share based compensation recognizing period	'3 years 2 months 12 days

Warrants_Purchase_Detail

Warrants Purchase (Detail) (Common Stock)	6 Months Ended
	Jun. 30, 2014
Expiration Date October 3, 2014	'
Class Of Warrant Or Right [Line Items]	'
Expiration Date	3-Oct-14
Number	2,334,044
Exercise Price	0.7
Expiration Date December 19, 2014	'
Class Of Warrant Or Right [Line Items]	'
Expiration Date	19-Dec-14
Number	166,666
Exercise Price	4.5

Fair_Value_of_Financial_Assets

Fair Value of Financial Assets and Liabilities (Detail) (USD $)	Jun. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Total assets measured at fair value	$154,780		$94,709
Commercial paper	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	45,156	[1]	45,110	[1]
Money market funds	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	60,054	[1]	911	[1]
Fair Value, Inputs, Level 1	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Total assets measured at fair value	105,210		911
Fair Value, Inputs, Level 1 | Commercial paper	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	45,156	[1]	'
Fair Value, Inputs, Level 1 | Money market funds	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	60,054	[1]	911	[1]
Fair Value, Inputs, Level 2	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Total assets measured at fair value	49,570		93,798
Fair Value, Inputs, Level 2 | Commercial paper	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	'		45,110	[1]
Corporate bonds	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	35,897	[2]	37,371	[2]
Corporate bonds | Fair Value, Inputs, Level 2	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	35,897	[2]	37,371	[2]
Municipal bonds	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	13,175	[3]	10,819	[2]
Municipal bonds | Fair Value, Inputs, Level 2	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	13,175	[3]	10,819	[2]
Certificates of deposit	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	498	[2]	498	[2]
Certificates of deposit | Fair Value, Inputs, Level 2	'		'
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]	'		'
Assets measured at fair value	$498	[2]	$498	[2]
[1]	Classified in cash and cash equivalents
[2]	Classified in marketable securities
[3]	Includes a short-term, highly rated, highly liquid investment that is included in cash and cash equivalents as the original maturity date was less than three months at the time of purchase. Municipal bond investments with original maturity dates greater than three months at the time of purchase are classified in marketable securities.

Computation_of_Basic_and_Dilut

Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, except Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Net Income Loss Per Common Share [Line Items]	'	'	'	'
Net loss	($2,800)	($2,065)	($7,969)	($6,182)
Denominator (basic and diluted):	'	'	'	'
Weighted average common shares outstanding	92,471,009	87,532,810	92,188,591	87,088,642
Net loss per share:	'	'	'	'
Basic	($0.03)	($0.02)	($0.09)	($0.07)
Diluted	($0.03)	($0.02)	($0.09)	($0.07)

Number_of_Outstanding_Stock_Op

Number of Outstanding Stock Options, Restricted Stock Units and Awards, Common Equivalent Shares from Stock Warrants, and Shares Purchased Under our Espp Excluded from Computation of Diluted Net Loss Per Share (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'	'
Stock options outstanding	3,021,735	5,016,362	3,714,028	5,276,932
Restricted stock units and awards	116,119	62,299	218,577	64,436
Common equivalent shares from stock warrants	2,326,302	2,262,543	2,356,681	2,292,039
Shares purchased under ESPP	7,063	'	29,190	'
Antidilutive securities excluded from computation of earnings per share, amount, total	5,471,219	7,341,204	6,318,476	7,633,407

Segment_Reporting_Additional_I

Segment Reporting - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
			Segment
Segment Reporting Information [Line Items]	'	'	'	'
Number of reportable segments	'	'	2	'
Amortization of acquired intangible assets	$2,231	$1,966	$4,462	$3,932
Consumer	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Amortization of acquired intangible assets	265	0	530	0
Enterprise	'	'	'	'
Segment Reporting Information [Line Items]	'	'	'	'
Amortization of acquired intangible assets	$1,966	$1,966	$3,932	$3,932

Financial_Information_of_Segme

Financial Information of Segments (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Revenue:	'	'	'	'	'
External customers	$115,713	$89,520	$223,299	$171,614	'
Intersegment revenue	'	'	'	'	'
Income (loss) from operations	-4,681	-2,191	-13,360	-6,107	'
Goodwill	159,342	'	159,342	'	159,342
Total assets	513,933	'	513,933	'	463,250
Eliminations	'	'	'	'	'
Revenue:	'	'	'	'	'
External customers	'	'	'	'	'
Intersegment revenue	-1,635	-1,307	-3,149	-2,544	'
Income (loss) from operations	'	'	'	'	'
Goodwill	'	'	'	'	'
Total assets	-562	'	-562	'	-481
Consumer | Operating Segment	'	'	'	'	'
Revenue:	'	'	'	'	'
External customers	109,338	82,574	210,333	157,667	'
Intersegment revenue	'	'	'	'	'
Income (loss) from operations	-278	762	-4,801	129	'
Goodwill	99,805	'	99,805	'	99,805
Total assets	405,617	'	405,617	'	349,394
Enterprise | Operating Segment	'	'	'	'	'
Revenue:	'	'	'	'	'
External customers	6,375	6,946	12,966	13,947	'
Intersegment revenue	1,635	1,307	3,149	2,544	'
Income (loss) from operations	-4,403	-2,953	-8,559	-6,236	'
Goodwill	59,537	'	59,537	'	59,537
Total assets	$108,878	'	$108,878	'	$114,337

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
In Thousands, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2013
					Lemon Inc	Lemon Inc	Lemon Inc
						Federal	State
Income Taxes [Line Items]	'	'	'	'	'	'	'
Income tax benefit	($1,919)	($179)	($5,467)	($29)	'	'	'
Minimum ownership percentage	'	'	'	'	5.00%	'	'
Net operating loss carryforwards	'	'	'	'	'	$7,894	$7,991

Contingencies_Additional_Infor

Contingencies - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014
Loss Contingencies [Line Items]	'
Value of the service guarantee	$1,000,000
Loss contingency signing bonus paid	$15,000
United States District Court	'
Loss Contingencies [Line Items]	'
Complaint filed date	'March 20, 2014
Name of defendant	'LifeLock, Inc, Kim Jones, and Cristy Schaan
Name of plaintiff	'Mr. Michael D. Peters
Independent Contractor Misclassification | Pending Litigation	'
Loss Contingencies [Line Items]	'
Complaint filed date	'September 2012
Name of defendant	'LifeLock, Inc and Todd Davis
Name of plaintiff	'Ms. Denise Richardson
Independent Contractor Misclassification | Dismissed Litigation	'
Loss Contingencies [Line Items]	'
Date of dismissal	11-Jun-14
Request for information	'Ms. Richardson filed a Notice of Voluntary Dismissal by which she voluntarily dismissed her ERISA claims against us, as well as her only claim against Mr. Davis. With respect to the remaining claims that are the subject of our motion to dismiss