10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2013

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission File Number: 0-17995

ZIX CORPORATION

(Exact Name of Registrant as Specified in its Charter)

Texas	75-2216818
(State of Incorporation)	(I.R.S. Employer Identification Number)

2711 North Haskell Avenue

Suite 2200, LB 36

Dallas, Texas 75204-2960

(Address of Principal Executive Offices)

(214) 370-2000

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	¨	Accelerated filer	x
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Class	Outstanding at August 2, 2013
Common Stock, par value $0.01 per share	61,998,860

INDEX

	Page Number
PART I — FINANCIAL INFORMATION
Item 1. Financial Statements (Unaudited)
Condensed Consolidated Balance Sheets at June 30, 2013 (unaudited) and December 31, 2012		3
Condensed Consolidated Statements of Income (unaudited) for the three and six months ended June  30, 2013 and 2012		4
Condensed Consolidated Statement of Stockholders’ Equity (unaudited) for the six months ended June 30, 2013		5
Condensed Consolidated Statements of Cash Flows (unaudited) for the six months ended June  30, 2013 and 2012		6
Notes to Condensed Consolidated Financial Statements		7
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations		10
Item 3. Quantitative and Qualitative Disclosures About Market Risk		17
Item 4. Controls and Procedures		17
PART II — OTHER INFORMATION
Item 1. Legal Proceedings		17
Item 1A. Risk Factors		17
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds		17
Item 3. Defaults Upon Senior Securities		17
Item 4. Mine Safety Disclosures		17
Item 5. Other Information		17
Item 6. Exhibits		18

2

ZIX CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except par values)	June 30, 2013			December 31, 2012
	(unaudited)
ASSETS
Current assets:
Cash and cash equivalents	$	26,308		$	22,988
Receivables, net		1,775			967
Prepaid and other current assets		1,364			1,697
Deferred tax assets		1,608			1,600
Total current assets		31,055			27,252
Property and equipment, net		2,587			2,384
Goodwill		2,161			2,161
Deferred tax assets		50,985			51,052
Total assets	$	86,788		$	82,849
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	537		$	501
Accrued expenses		2,649			2,655
Deferred revenue		17,317			17,470
Total current liabilities		20,503			20,626
Long-term liabilities:
Deferred revenue		957			902
Deferred rent		81			76
Total long-term liabilities		1,038			978
Total liabilities		21,541			21,604
Commitments and contingencies (see Note 7)
Stockholders’ equity:
Preferred stock, $1 par value, 10,000,000 shares authorized; none issued and outstanding		—			—
Common stock, $0.01 par value, 175,000,000 shares authorized; 73,874,553 issued and 61,973,653 outstanding in 2013 and 73,165,433 issued and 61,264,533 outstanding in 2012		731			728
Additional paid-in capital		357,308			355,747
Treasury stock, at cost; 11,900,900 common shares in 2013 and 11,900,900 common shares in 2012		(41,506	)		(41,506	)
Accumulated deficit		(251,286	)		(253,724	)
Total stockholders’ equity		65,247			61,245
Total liabilities and stockholders’ equity	$	86,788		$	82,849

See notes to condensed consolidated financial statements.

3

ZIX CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
(In thousands, except per share data)	2013			2012			2013			2012
Revenues	$	11,838		$	10,343		$	23,602		$	20,644
Cost of revenues		1,903			1,812			3,839			3,667
Gross margin		9,935			8,531			19,763			16,977
Operating expenses:
Research and development		2,488			1,465			5,099			2,942
Selling, general and administrative		5,532			4,370			12,148			8,700
Total operating expenses		8,020			5,835			17,247			11,642
Operating income		1,915			2,696			2,516			5,335
Other income, net		64			5			124			10
Income before income taxes		1,979			2,701			2,640			5,345
Income tax expense		(108	)		(58	)		(202	)		(276	)
Net Income	$	1,871		$	2,643		$	2,438		$	5,069
Basic income per common share	$	0.03		$	0.04		$	0.04		$	0.08
Diluted income per common share	$	0.03		$	0.04		$	0.04		$	0.08
Basic weighted average common shares outstanding		61,158,009			61,103,342			61,068,294			62,063,059
Diluted weighted average common shares outstanding		62,451,546			61,721,859			62,242,401			62,743,297

See notes to condensed consolidated financial statements.

4

ZIX CORPORATION

CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY

(Unaudited)

	Stockholders’ Equity
(In thousands, except shares)	Common Stock				Additional Paid-In		Treasury			Accumulated			Total Stockholders’
	Shares		Amount		Capital		Stock			Deficit			Equity
Balance, December 31, 2012		73,165,433	$	728	$	355,747	$	(41,506	)	$	(253,724	)	$	61,245
Issuance of common stock upon exercise of stock options		324,120		3		714		—			—			717
Issuance of restricted common stock		385,000		—		—		—			—			—
Employee stock-based compensation costs		—		—		847		—			—			847
Net income		—		—		—		—			2,438			2,438
Balance, June 30, 2013		73,874,553	$	731	$	357,308	$	(41,506	)	$	(251,286	)	$	65,247

See notes to condensed consolidated financial statements.

5

ZIX CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

(In thousands)	Six Months Ended June 30,
	2013			2012
Operating activities:
Net income	$	2,438		$	5,069
Non-cash items in net income:
Depreciation and amortization		711			659
Employee stock-based compensation costs		847			458
Non-employee stock-based compensation costs		—			6
Changes in deferred taxes		59			54
Changes in operating assets and liabilities:
Receivables		(808	)		32
Prepaid and other current assets		333			(352	)
Accounts payable		70			(62	)
Deferred revenue		(98	)		1,238
Accrued and other liabilities		(1	)		375
Net cash provided by operating activities		3,551			7,477
Investing activities:
Purchases of property and equipment		(948	)		(622	)
Net cash used in investing activities		(948	)		(622	)
Financing activities:
Proceeds from exercise of stock options		717			252
Purchase of treasury shares		—			(9,000	)
Net cash provided by (used in) financing activities		717			(8,748	)
Increase (decrease) in cash and cash equivalents		3,320			(1,893	)
Cash and cash equivalents, beginning of period		22,988			20,680
Cash and cash equivalents, end of period	$	26,308		$	18,787

See notes to condensed consolidated financial statements.

6

ZIX CORPORATION

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Basis of Presentation

The accompanying condensed consolidated financial statements of Zix Corporation (“ZixCorp,” the “Company,” “we,” “our,” “us”) should be read in conjunction with the audited consolidated financial statements included in the Company’s 2012 Annual Report on Form 10-K. These financial statements are unaudited, but have been prepared in the ordinary course of business for the purpose of providing information with respect to the covered interim periods. Management of the Company believes that all adjustments necessary for a fair presentation for such periods have been included and are of a normal recurring nature. The results of operations for the six-month period ended June 30, 2013, are not necessarily indicative of the results to be expected for any future periods or for the full fiscal year.

2. Recent Accounting Standards and Pronouncements

Presentation of Other Comprehensive Income

In February 2013, the FASB issued guidance that requires entities to provide information about the amounts reclassified out of accumulated other comprehensive income by component and to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. This new guidance did not have an impact on our condensed consolidated financial statements.

3. Stock- Based Awards and Stock-Based Employee Compensation Expense

Our stock-based awards include stock options, restricted stock, and restricted stock units (“RSU’s”). As of June 30, 2013, the Company had 7,312,377 stock options outstanding and 505,346 shares available for grant.

Stock Option Activity

There were 114,683 and 324,120 stock options exercised for the three and six month periods ended June 30, 2013, respectively. There were 130,268 and 142,368 stock options exercised for the three and six month periods ended June 30, 2012. There was a $30 thousand excess tax benefit recorded in the three month period ended June 30, 2013, related to the 114,683 option exercises. The excess tax benefit recorded in the six month period ended June 30, 2013, related to the 324,120 option exercises was $47 thousand. A deferred tax asset totaling $167 thousand and $136 thousand, resulting from stock-based compensation expense associated with options relating to the Company’s U.S. operations, was recorded for the six month periods ended June 30, 2013 and 2012, respectively.

The following is a summary of all stock option transactions during the three months ended June 30, 2013:

	Options			Weighted Average Exercise Price		Weighted  Average Remaining Contractual Term (Yrs)
Outstanding at March 31, 2013		7,453,060		$	4.32
Granted at market price		—			—
Cancelled or expired		(26,000	)	$	5.20
Exercised		(114,683	)	$	2.85
Outstanding at June 30, 2013		7,312,377		$	4.34		4.22
Options exercisable at June 30, 2013		6,194,048		$	4.59		3.38

At June 30, 2013, we had 4,349,819 stock options outstanding and 3,231,490 options exercisable in which the exercise price was lower than the market price of the Company’s common stock. The aggregate intrinsic value of these options was $6.4 million and $5.0 million, respectively.

For additional information regarding the Company’s Stock Options and Stock-based Employee Compensation, see Note 4 to the consolidated financial statements contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

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Restricted Stock Activity

The following is a summary of all restricted stock activity during the three months ended June 30, 2013:

	Restricted Shares		Weighted Average Fair Value
Outstanding at March 31, 2013		736,000	$	2.99
Granted at market price		—		—
Vested		—		—
Cancelled		—		—
Unvested restricted stock at June 30, 2013		736,000	$	2.99

Restricted Stock Unit Activity

The following is a summary of all RSU activity during the three months ended June 30, 2013:

	Restricted Stock  Units		Weighted Average Fair Value
Non-vested at March 31, 2013		208,000	$	2.93
Granted at market price		—		—
Vested		—		—
Cancelled		—		—
Unvested restricted stock units at June 30, 2013		208,000	$	2.93

The weighted average grant-date fair value of awards of restricted stock and RSU’s (collectively “restricted stock”) is based on the quoted market price of the Company’s common stock on the date of grant.

Stock-Based Compensation Expense

For the three and six month periods ended June 30, 2013, the total stock-based employee compensation expense resulting from stock options, restricted stock, and RSU’s was recorded to the following line items of the Company’s condensed consolidated statements of operations:

(In thousands)	Three Months Ended June  30, 2013		Six Months Ended June  30, 2013
Cost of revenues	$	45	$	87
Research and development		54		106
Selling, general and administrative		345		654
Stock-based compensation expense	$	444	$	847

As of June 30, 2013, there was $4.3 million of total unrecognized stock-based compensation related to non-vested stock-based compensation awards granted under the incentive plans. This cost is expected to be recognized over a weighted average period of 1.77 years.

4. Supplemental Cash Flow Information

Supplemental cash flow information relating to taxes:

	Six Months Ended June 30,
(In thousands)	2013		2012
Cash income tax payments	$	118	$	214

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5. Receivables, net

(In thousands)	June 30, 2013			December 31, 2012
Receivables	$	1,875		$	995
Allowance for returns and doubtful accounts		(100	)		(28	)
Note receivable		458			458
Allowance for note receivable		(458	)		(458	)
Receivables, net	$	1,775		$	967

The allowance for doubtful accounts includes all specific accounts receivable which we believe are likely not collectible based on known information. In addition, we record 2.5% of all accounts receivable greater than 90 days past due, net of those accounts specifically reserved, as a general allowance against accounts that could potentially become uncollectible.

The note receivable represents the remaining outstanding balance of an original note related to the sale of a product line in 2005 in the amount of $540 thousand. This was fully reserved at the time of the sale as the note’s collectability was not assured. The note receivable is fully reserved at June 30, 2013.

6. Earnings Per Share and Potential Dilution

Basic earnings per share are computed using the weighted average number of common shares outstanding for the period. The dilutive effect of potential common shares outstanding is included in diluted earnings per share. The computations for basic and diluted earnings per share for the three and six months ended June 30, 2013 and 2012, are as follows:

	Three Months ended June 30,				Six Months ended June 30,
	2013		2012		2013		2012
Basic weighted average shares		61,158,009		61,103,342		61,068,294		62,063,059
Effect of dilutive securities:
Employee and director stock options		998,058		618,517		939,781		680,238
Restricted stock		226,824		—		178,956		—
RSU’s		68,655		—		55,370		—
Potential dilutive common shares		62,451,546		61,721,859		62,242,401		62,743,297

During the three months ended June 30, 2013, weighted average shares related to 4,701,116 stock options were excluded from the calculation of diluted earnings per share because the exercise price of the awards was in excess of the market price and such awards are therefore anti-dilutive. During the six months ended June 30, 2013, weighted average shares related to 4,974,599 stock options, 62,562 shares of restricted stock, and 15,438 RSU’s were excluded from the calculation of diluted earnings per share because the exercise price of the awards was in excess of the market price and such awards are therefore anti-dilutive. During the three and six months ended June 30, 2012, weighted average shares of 5,596,445 and 5,330,568, respectively, related to stock options were excluded from the calculation of diluted earnings per share because the stock options were similarly anti-dilutive.

7. Commitments and contingencies

A summary of our fixed contractual obligations and commitments at June 30, 2013, is as follows:

	Payments Due by Period
(In thousands)	Total		1 Year		Years 2 & 3		Years 4 & 5		Beyond 5 Years
Operating leases	$	11,683	$	604	$	2,269	$	2,110	$	6,700

We have not entered into any material, non-cancelable purchase commitments at June 30, 2013.

9

Claims and Proceedings

We may be subject to legal claims, litigation, and other legal proceedings. The expenses of those matters could be significant. There is no current or pending material legal proceeding. We expect no adverse effect on our operations or financial results as a result of the cost or other impacts of concluded legal proceedings.

8. Fair Value Measurements

FASB guidance regarding fair value measurement establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices for similar assets and liabilities in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions.

For certain of the Company’s financial instruments, including cash and cash equivalents, trade receivables, and accounts payable, the fair values approximate carrying values due to the short-term maturities of these instruments. The carrying values of other current assets and accrued expenses are also not recorded at fair value, but approximate fair values primarily due to their short-term nature.

9. Common Stock Repurchase Program

During the six months ended June 30, 2012, the Company repurchased 3,080,966 shares at an aggregate cost of $9.0 million under a $15 million share repurchase program authorized by our board of directors announced November 9, 2011. This repurchase program was completed during the three months ended June 30, 2012. No stock repurchases have occurred during the six-month period ending June 30, 2013.

10. Income Taxes

At the end of 2012, the Company recorded a $2.3 million tax benefit by reducing the valuation allowance related to its deferred tax assets. This reduction was determined through an assessment of future deferred tax asset utilization following accounting guidance which relies largely on historical earnings. Using the same methodology, and updating the future taxable earnings estimates based on first and second quarter 2013 actual earnings, the Company believes its future U.S. federal taxable earnings estimate to be established at the end of 2013 will exceed the estimate used at the end of 2012. For this reason, the Company offset its first and second quarter 2013 federal deferred tax provision by reducing its valuation allowance by an equal amount, thereby eliminating from its deferred tax provision federal taxes in excess of the estimated Alternative Minimum Tax from the Company’s first and second quarter 2013 financial statements. The Company expects to follow this same methodology in the third quarter of 2013 and will reevaluate the need for its valuation allowance at December 31, 2013, following the same assessment that was performed at December 31, 2012.

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

NOTE ON FORWARD-LOOKING STATEMENTS AND RISK FACTORS

Statements in this report which are not purely historical facts or which necessarily depend upon future events, including statements about trends, uncertainties, hopes, beliefs, anticipations, expectations, plans, intentions or strategies for the future, may be forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934. Forward-looking statements involve risks and uncertainties that could cause actual events or results to differ materially from the events or results described in the forward-looking statements, including risks and uncertainties described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012. Any of these risk factors could have a material adverse effect on our business, financial condition or financial results and reduce the value of an investment in our securities. We may not succeed in addressing these and other risks associated with an investment in our securities, with our business and with our achieving any forward-looking statements. Readers are cautioned not to place undue reliance on forward-looking statements. All forward-looking statements are based upon information available to us on the date the statements are made. We undertake no obligation to publicly update or revise any forward-looking statements, whether as a result of new information, future events or otherwise.

10

Overview

ZixCorp^® offers email encryption and data loss prevention solutions to meet the data protection and compliance needs of organizations primarily in the healthcare, financial services, insurance and government sectors. ZixCorp Email Encryption Service enables the secure exchange of email for sensitive information and offers the industry’s only fully transparent delivery, such that secure email can be sent and received without extra steps or passwords. ZixCorp has the world’s largest email encryption community with tens of millions of members and growing by approximately 100,000 members per week. Our members include all federal financial regulators—such as those on the Federal Financial Institutions Examination Council (FFIEC)—divisions of the U.S. Treasury, the U.S. Securities and Exchange Commission (SEC), the Financial Industry Regulatory Agency (FINRA), one in every five U.S. banks, more than 30 Blue Cross Blue Shield organizations and one in every five U.S. hospitals.

ZixCorp^® Email Encryption is a comprehensive secure messaging service, which allows an enterprise to use policy-driven rules to determine which email messages should be sent securely to comply with regulations or company-defined policies. ZixCorp’s main differentiation in the marketplace is our exceptional ease of use. The best example of this is our ability to provide transparent delivery of secure, encrypted email between our ZixGateway^® subscribing customers. More than 30 percent of all ZixCorp encrypted messages are received transparently, which allows recipients to access secure email just like regular email—without any extra steps or passwords. Most email encryption solutions are focused on the sender. They typically introduce an added burden on receivers, often requiring additional user authentication with creation of a new user identity and password. We designed our solution to alleviate the receiver’s burden by enabling the delivery of encrypted email automatically and transparently. ZixCorp enables transparent delivery by (1) ZixDirectory^®, the world’s largest email encryption community which is designed to share identities, (2) ZixCorp’s Best Method of Delivery ™, which is designed to deliver email according to the sender’s encryption policy, and (3) ZixGateway^®, which is an enterprise gateway that automatically decrypts the message. The result is secure encrypted email exchange that is transparent for both sender and receiver.

In March 2013 the Company launched ZixDLP^TM, an email-specific data loss prevention (“DLP”) solution. ZixDLP addresses business’s greatest source of data loss—email. By focusing strictly on email, ZixCorp provides a straightforward DLP approach that decreases the cost, reduces deployment time from months to hours and minimizes impact on customer resources and workflow.

The Company has also launched ZixOne^TM, a unique bring-your-own-device (BYOD) secure mobile email application. ZixOne sets itself apart in the BYOD market by meeting the employees’ desire to use their own devices for work and maintain control and privacy while giving IT the ability to secure data and meet compliance needs. ZixOne is scheduled for commercial availability on Sept. 3, 2013.

Our business operations and service offerings are supported by the ZixData Center™, a SysTrust/SOC3 certified, SOC2 accredited, PCI Level 1, DSS V2.0 certified facility. The operations of the ZixData Center are independently audited annually to maintain AICPA SysTrust/SOC3 certification in the areas of security, confidentiality, integrity and availability. Auditors also produce a SOC2 (formerly SAS70 Type II) report on the effectiveness of operational controls used over the audit period. The ZixData Center is staffed 24 hours a day with a proven 99.99% reliability rate.

Critical Accounting Policies and Estimates

The preparation of financial statements and related disclosures in accordance with accounting principles generally accepted in the United States requires the Company’s management to make estimates and assumptions that affect the amounts reported in the Company’s condensed consolidated financial statements and accompanying notes. Actual results could differ from these estimates and assumptions. Critical accounting policies and estimates are defined as those that are both most important to the portrayal of the Company’s financial condition and results and require management’s most subjective judgments.

We describe our significant accounting policies in Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements included in our Annual Report on Form 10-K for the year ended December 31, 2012. We discuss our Critical Accounting Policies and Estimates in Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K for the year ended December 31, 2012.

Results of Operations

Second Quarter 2013 Summary of Operations

Financial

• Revenue for the quarter ended June 30, 2013, was $11.8 million compared with $10.3 million for the same period in 2012, representing a 14% increase.

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• Gross margin for the quarter ended June 30, 2013, was $9.9 million or 84% of revenues compared with $8.5 million or 82% of revenues for the comparable period in 2012.

• Net income for the quarter ended June 30, 2013, was $1.9 million compared with net income of $2.6 million in the comparable period in 2012.

• Ending cash and cash equivalents were $26.3 million on June 30, 2013, compared with $23.0 million on December 31, 2012.

Operations

• New first year orders (“NFYOs”) for the quarter ended June 30, 2013, were $2.4 million. As of June 30, 2013, backlog was $63.4 million.

Revenues

Email Encryption is a subscription-based service. The following table sets forth a quarter-over-quarter comparison of the Company’s revenues:

	Three Months Ended June 30,				3-month Variance 2013 vs. 2012					Six Months Ended June 30,				6-month Variance 2013 vs. 2012
(in thousands)	2013		2012		$		%			2013		2012		$		%
Revenues	$	11,838	$	10,343	$	1,495		14	%	$	23,602	$	20,644	$	2,958		14	%

The increase in revenue was due to the growth inherent in a successful subscription model with steady additions to the subscriber base coupled with a high rate of existing customer renewals.

Revenue Indicators — Backlog, Orders and Deployments

Backlog — Our end-user order backlog is comprised of contractually bound agreements that we expect to amortize into revenue as the services are performed. The timing of revenue is affected by both the length of time required to deploy a service and the length of the service contract.

As of June 30, 2013, total backlog was $63.4 million and we expect approximately 55% of the total backlog to be recognized as revenue during the next twelve months. As of June 30, 2013, the backlog was comprised of the following elements: $18.3 million of deferred revenue that has been billed and paid, $8.0 million billed but unpaid, and approximately $37.1 million of unbilled contracts. The second quarter ending backlog was a 14% increase over the $55.5 million backlog at the end of the second quarter 2012 and 10% above the ending backlog of $57.7 million at December 31, 2012.

Orders — Total orders were $15.6 million and $13.6 million for the three-month periods ended June 30, 2013 and 2012, respectively. Total orders include contract renewals, NFYOs, and in the case of new multi-year contracts, the years beyond the first year of service. NFYOs were $2.4 million and $2.5 million for the three-month period ended June 30, 2013 and 2012, respectively.

Cost of Revenues

The following table sets forth a quarter-over-quarter comparison of the cost of revenues:

	Three Months Ended June 30,				3-month Variance 2013 vs. 2012					Six Months Ended June 30,				6-month Variance 2013 vs. 2012
(in thousands)	2013		2012		$		%			2013		2012		$		%
Cost of revenues	$	1,903	$	1,812	$	91		5	%	$	3,839	$	3,667	$	172		5	%

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Cost of revenues is comprised of costs related to operating and maintaining the ZixData Center, a field deployment team, customer service and support and the amortization of Company-owned, customer-based computer appliances. A significant portion of the total cost of revenues relates to the ZixData Center, which currently has excess capacity. Accordingly, cost of revenues is relatively fixed and is therefore expected to grow at a slower pace than revenue. The minor period over period cost increases depicted in the table above resulted primarily from increases in average headcount.

Research and Development Expenses

The following table sets forth a quarter-over-quarter comparison of our research and development expenses:

	Three Months Ended June 30,				3-month Variance 2013 vs. 2012					Six Months Ended June 30,				6-month Variance 2013 vs. 2012
(in thousands)	2013		2012		$		%			2013		2012		$		%
Research and development expenses	$	2,488	$	1,465	$	1,023		70	%	$	5,099	$	2,942	$	2,157		73	%

Research and development expenses consist primarily of salary, benefits, and stock-based compensation for our development staff, and other direct and indirect costs associated with enhancing our existing products and services and developing new products and services. The 70% and 73% increases in expenses for the three and six month periods ended June 30, 2013, respectively compared to the same respective periods in 2012 resulted from additional headcount, both new employees and independent contractors, primarily related to new product development. As announced in July of 2012, the Company increased new product investment spending to deliver two new products, ZixDLP and ZixOne. ZixDLP, an email data loss prevention product, was delivered in March 2013 and is now commercially available. The Company launched a beta version of ZixOne, a bring your own device (“BYOD”) management solution in May 2013. Commercial availability for ZixOne is currently scheduled for late in the third quarter 2013. Research and development expenses for the second half of 2013 are expected to remain relatively flat with the expenses incurred in the first half 2013.

Selling and Marketing Expenses

The following table sets forth a quarter-over-quarter comparison of our selling and marketing expenses:

	Three Months Ended June 30,				3-month Variance 2013 vs. 2012					Six Months Ended June 30,				6-month Variance 2013 vs. 2012
(in thousands)	2013		2012		$		%			2013		2012		$		%
Selling and marketing expenses	$	3,640	$	2,521	$	1,119		44	%	$	7,250	$	5,052	$	2,198		44	%

Selling and marketing expenses consist primarily of salary, commissions, travel, stock-based compensation and employee benefits for selling and marketing personnel and costs associated with promotional activities and advertising campaigns. The quarter over quarter expense increase resulted primarily from higher average headcount and sales commissions accounting for approximately $0.7 million of the total increase. Additionally, marketing expenses increased approximately $0.4 million due to non-headcount expenses relating primarily to new marketing campaigns and programs designed to increase awareness and demand for the Company’s products and services. The 44% increase in the first half of 2013 compared to the same period in 2012 resulted primarily from higher average headcount and sales commissions which increased by approximately $1.4 million during the period. Additionally, marketing expenses increased approximately $0.8 million due to non-headcount marketing expenses relating to new marketing campaigns described above.

13

General and Administrative Expenses

The following table sets forth a quarter-over-quarter comparison of our general and administrative expenses:

	Three Months Ended June 30,				3-month Variance 2013 vs. 2012					Six Months Ended June 30,				6-month Variance 2013 vs. 2012
(in thousands)	2013		2012		$		%			2013		2012		$		%
General and administrative expenses	$	1,892	$	1,849	$	43		2	%	$	4,898	$	3,648	$	1,250		34	%

General and administrative expenses consist primarily of salary and bonuses, travel, stock-based compensation and benefits for administrative and executive personnel as well as fees for professional services and other general corporate activities. The increase in the six month period ended June 30, 2013, compared to the same period in 2012 resulted primarily from a year-over-year increase in outside legal counsel fees associated with litigation ($1.1 million) and minor net expense increases and decreases incurred in providing other general corporate services. We have settled those litigation matters for which we incurred substantially all of our increased legal expenses. We expect to incur no additional costs for those settled litigation matters. Please see Claims and Proceedings under Footnote 7 to the condensed consolidated financial statements.

Provision for Income Taxes

The provision for income taxes was $108 thousand and $58 thousand for the three-month periods ended June 30, 2013 and 2012, respectively, and $202 thousand and $276 thousand, for the six-month periods ended June 30, 2013 and 2012, respectively. The operating losses incurred by the Company’s U.S. operations in past years and the resulting net operating losses for U.S. Federal tax purposes are subject to a $49.4 million reserve because of the uncertainty of future taxable income levels sufficient to utilize our net operating losses and credits. Our June 30, 2013, provision of $202 thousand includes $56 thousand in state taxes currently payable based on gross revenues, $59 thousand related to deferred state taxes, $28 thousand related to the federal Alternative Minimum Tax, and $59 thousand in taxes related to our Canadian operations. Our June 30, 2012, provision of $276 thousand consisted of $102 thousand in state taxes payable based on gross revenues, $54 thousand related to deferred state taxes, $75 thousand related to the federal Alternative Minimum Tax, and taxes related to our Canadian operations totaling $45 thousand.

There were no penalty-related charges to selling, general and administrative expenses accrued or recognized for the three month periods ended June 30, 2013 and 2012. Additionally, we have not taken a tax position that would have a material effect on the financial statements or the effective tax rate for the three-month period ended June 30, 2013. We are currently subject to a three-year statute of limitations by major tax jurisdictions.

At June 30, 2013, the Company partially reserved its U.S. net deferred tax assets due to the uncertainty of future taxable income sufficient to utilize net loss carryforwards prior to their expiration. The Company did not reserve a portion, $52.6 million, of its U.S. net deferred tax assets. The majority of this unreserved portion related to $43.9 million in U.S. net operating losses (“NOLs”) because we believe the Company will generate sufficient taxable income in future years to utilize these NOLs prior to their expiration. The remaining balance consists of $5.6 million relating to temporary differences between GAAP and tax-related expense, $2.1 million relating to U.S. state income tax credits and net operating loss carryovers, and $1 million related to Alternative Minimum Tax credits.

At the end of 2012, the Company recorded a $2.3 million tax benefit by reducing the valuation allowance related to its deferred tax assets. This reduction was determined through an assessment of future deferred tax asset utilization following accounting guidance which relies largely on historical earnings. Using the same methodology, and updating the future taxable earnings estimates based on first and second quarter 2013 actual earnings, the Company believes its future U.S. federal taxable earnings estimate to be established at the end of 2013 will exceed the estimate used at the end of 2012. For this reason, the Company offset its first and second quarter 2013 federal deferred tax provision by reducing its valuation allowance by an equal amount, thereby eliminating from its deferred tax provision federal taxes in excess of the estimated Alternative Minimum Tax from the Company’s first and second quarter 2013 financial statements. The Company expects to follow this same methodology in the third quarter of 2013 and will reevaluate the need for its valuation allowance at December 31, 2013, following the same assessment methodology that was performed at December 31, 2012. Adjusting our valuation allowance could have a significant impact on operating results in the period that it becomes more likely than not that an additional portion of our deferred tax assets will or will not be realized.

We have determined that utilization of existing net operating losses against future taxable income is not subject to limitation by Section 382 of the Internal Revenue Code. Future ownership changes, however, may limit the company’s ability to fully utilize its existing net operating loss carryforwards against future taxable income.

14

As indicated earlier, the operating losses incurred by our U.S. operations and the resulting net operating losses for U.S. Federal tax purposes are subject to a partial reserve. Significant judgment is required in determining any reserve recorded against the deferred tax asset. In assessing the need for a reserve, we consider all available evidence, including past operating results, estimates of future taxable income, and the feasibility of tax planning strategies.

Net Income

The net income for the three months ended June 30, 2013, of $1.9 million is a decrease of $772 thousand compared to the net income of $2.6 million for the same period last year. Our increased revenue and resulting higher gross margin was offset by increased R&D and SG&A spending, as discussed above.

Liquidity and Capital Resources

Overview

Based on our performance over the last four quarters and current expectations, we believe our cash and cash equivalents and cash generated from operations, will satisfy our working capital needs, capital expenditures, investment requirements, contractual obligations, commitments, future customer financings, and other liquidity requirements associated with our operations through at least the next twelve months. At June 30, 2013, our cash and cash equivalents totaled $26.3 million, an increase of $3.3 million from the December 31, 2012 balance, and we had no debt.

Sources and Uses of Cash Summary

	Six Months Ended June 30,
(In thousands)	2013			2012
Net cash provided by operations	$	3,551		$	7,477
Net cash used in investing activities	$	(948	)	$	(622	)
Net cash provided by (used in) financing activities	$	717		$	(8,748	)

Our primary source of liquidity from our operations is the collection of revenue in advance from our customers and accounts receivable from our customers, net of the timing of payments to our vendors and service providers.

Our investing activities consist primarily of computer and networking equipment purchases.

Financing activities include the receipt of $717 thousand from the exercise of stock options in the first two quarters of 2013. Cash used in financing activities in the first two quarters of 2012 included a $9.0 million repurchase of common stock, partially offset by $252 thousand received from the exercise of stock options.

Options of ZixCorp Common Stock

We have significant options outstanding that are currently vested. There is no assurance that any of these options will be exercised; therefore, the extent of future cash inflow from additional option activity is not certain. The following table summarizes the options that were outstanding as of June 30, 2013. The vested shares are a subset of the outstanding shares. The value of the shares is the number of shares multiplied by the exercise price for each share.

	Summary of Outstanding Options
Exercise Price Range	Outstanding Options		Total Value  of Outstanding Options (In  thousands)		Vested Options (included in outstanding options)		Total Value  of Vested Options (In thousands)
$1.11  –  $1.99		1,059,336	$	1,581		1,059,336	$	1,581
$2.00  –  $3.49		2,053,187		5,567		1,125,700		3,012
$3.50  –  $4.99		2,621,862		11,349		2,431,020		10,612
$5.00  –  $5.99		286,500		1,432		286,500		1,433
$6.00  –  $8.99		498,700		3,262		498,700		3,262
$9.00  –  $11.00		792,792		8,496		792,792		8,496
Total		7,312,377	$	31,687		6,194,048	$	28,396

15

Off-Balance Sheet Arrangements

None.

Contractual Obligations, Contingent Liabilities and Commitments

A summary of our fixed contractual obligations and commitments at June 30, 2013, is as follows:

	Payments Due by Period
(In thousands)	Total		1 Year		Years 2 & 3		Beyond 3 Years
Operating leases	$	11,683	$	604	$	2,269	$	8,810

We have not entered into any material, non-cancelable purchase commitments at June 30, 2013.

We have severance agreements with certain employees which would require the Company to pay approximately $2.7 million if all such employees separated from employment with our Company following a change of control, as defined in the severance agreements.

16

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We have no material changes to the disclosure on this matter made in our Annual Report on Form 10-K for the year ended December 31, 2012.

ITEM 4. CONTROLS AND PROCEDURES

The Company, under the supervision and with the participation of its management, including the Chief Executive Officer and the Principal Accounting Officer, evaluated the effectiveness of the design and operation of the Company’s “disclosure controls and procedures” (as defined in Rule 13a-15(e)) under the Exchange Act as of the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer and the Principal Accounting Officer concluded that the Company’s disclosure controls and procedures were effective as of June 30, 2013.

Changes in Internal Controls over Financial Reporting

During the six months ended June 30, 2013, there have been no changes in our internal control over financial reporting that have materially affected or are reasonably likely to materially affect internal control over financial reporting.

PART II — OTHER INFORMATION

ITEM 1. Legal Proceedings

None.

ITEM 1A. Risk Factors

See Part I, Item 1A, “Risk Factors,” of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012. There have been no material changes in our risk factors from those disclosed in such Annual Report on Form 10-K. The risk factors in our Form 10-K should be read in conjunction with the considerations set forth above in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” set forth in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a) None.

(b) None.

(c) None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

17

ITEM 6. EXHIBITS

a. Exhibits

The following is a list of exhibits filed as part of this Quarterly Report on Form 10-Q:

Exhibit No.	Description of Exhibits
3.1	Restated Articles of Incorporation of Zix Corporation, as filed with the Texas Secretary of State on November 10, 2005. Filed as Exhibit 3.1 to Zix Corporation’s Annual Report on Form 10-K for the year ended December 31, 2005, and incorporated herein by reference.
3.2	Amended and Restated Bylaws of Zix Corporation, dated January 1, 2013. Filed as Exhibit 3.1 to Zix Corporation’s Current Report on Form 8-K, dated December 31, 2012, and incorporated herein by reference.
31.1*	Certification of Richard D. Spurr, President and Chief Executive Officer of the Company, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Michael W. English, Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer) of the Company, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1**	Certification of CEO and CFO, pursuant to 18 U.S.C. Section 1350, as adopted, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.1***	101. INS (XBRL Instance Document) 101. SCH (XBRL Taxonomy Extension Schema Document) 101. CAL (XBRL Calculation Linkbase Document) 101. LAB (XBRL Taxonomy Label Linkbase Document) 101. DEF (XBRL Taxonomy Linkbase Document) 101. PRE (XBRL Taxonomy Presentation Linkbase Document)

* Filed herewith.

** Furnished herewith.

*** In accordance with Rule 406T of Regulation S-T, the XBRL related information shall not be deemed to be “filed” for purposes of Section 18 of the Exchange Act, or otherwise subject to the liability of that section, and shall not be part of any registration statement or other document filed under the Securities Act or the Exchange Act, except as shall be expressly set forth by specific reference in such filing.

18

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	ZIX CORPORATION
Date: August 6, 2013	By:	/s/ MICHAEL W. ENGLISH
		Michael W. English
		Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

19

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, Richard D. Spurr, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Zix Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 6, 2013	/s/ RICHARD D. SPURR
	Richard D. Spurr
	President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Michael W. English, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Zix Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officers and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 6, 2013	/s/ MICHAEL W. ENGLISH
	Michael. W. English
	Chief Financial Officer (Principal Financial Officer
	and Principal Accounting Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CEO AND CFO PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

August 6, 2013

Securities and Exchange Commission

450 Fifth Street, N.W.

Washington, D.C. 20549

Ladies and Gentlemen:

The certifications set forth below are being submitted in connection with the Quarterly Report on Form 10-Q (the “Report”) of Zix Corporation for the purpose of complying with Rule 13a-14(b) or Rule 15d-14(b) of the Securities Exchange Act of 1934 (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code.

Richard D. Spurr, the chief executive officer, and Michael W. English, the chief financial officer of Zix Corporation, each certifies that to the best of his knowledge and in the respective capacities as an officer of Zix Corporation:

1. the Report fully complies with the requirements of Section 13(a) or 15(d) of the Exchange Act; and

2. the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of Zix Corporation.

/s/ RICHARD D. SPURR

Name: Richard D. Spurr

Title: President and Chief Executive Officer

/s/ MICHAEL W. ENGLISH

Name: Michael W. English

Title: Chief Financial Officer

XML

Recent Accounting Standards and Pronouncements (Policies)

6 Months Ended

Jun. 30, 2013

Accounting Changes And Error Corrections [Abstract]

Presentation of Other Comprehensive Income

Presentation of Other Comprehensive Income

In February 2013, the FASB issued guidance that requires entities to provide information about the amounts reclassified out of accumulated other comprehensive income by component and to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. This new guidance did not have an impact on our condensed consolidated financial statements.

Fair Value Measurements

FASB guidance regarding fair value measurement establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices for similar assets and liabilities in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions.

For certain of the Company’s financial instruments, including cash and cash equivalents, trade receivables, and accounts payable, the fair values approximate carrying values due to the short-term maturities of these instruments. The carrying values of other current assets and accrued expenses are also not recorded at fair value, but approximate fair values primarily due to their short-term nature.

XML

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Revenues	$ 11,838	$ 10,343	$ 23,602	$ 20,644
Cost of revenues	1,903	1,812	3,839	3,667
Gross margin	9,935	8,531	19,763	16,977
Operating expenses:
Research and development	2,488	1,465	5,099	2,942
Selling, general and administrative	5,532	4,370	12,148	8,700
Total operating expenses	8,020	5,835	17,247	11,642
Operating income	1,915	2,696	2,516	5,335
Other income, net	64	5	124	10
Income before income taxes	1,979	2,701	2,640	5,345
Income tax expense	(108)	(58)	(202)	(276)
Net Income	$ 1,871	$ 2,643	$ 2,438	$ 5,069
Basic income per common share	$ 0.03	$ 0.04	$ 0.04	$ 0.08
Diluted income per common share	$ 0.03	$ 0.04	$ 0.04	$ 0.08
Basic weighted average common shares outstanding	61,158,009	61,103,342	61,068,294	62,063,059
Diluted weighted average common shares outstanding	62,451,546	61,721,859	62,242,401	62,743,297

XML

Supplemental Cash Flow Information

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information

4. Supplemental Cash Flow Information

Supplemental cash flow information relating to taxes:

	Six Months Ended June 30,
(In thousands)	2013		2012
Cash income tax payments	$	118	$	214

XML

Stock- Based Awards and Stock-Based Employee Compensation Expense - Summary of All Stock Option Transactions (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]
Options, Outstanding, Beginning Balance	7,453,060
Options, Granted at market price
Options, Cancelled or expired	(26,000)
Options, Exercised	(114,683)	(130,268)	(324,120)	(142,368)
Options, Outstanding Ending Balance	7,312,377		7,312,377
Options, Options Exercisable	6,194,048		6,194,048
Weighted Average Exercise Price, Outstanding, Beginning Balance	$ 4.32
Weighted Average Exercise Price, Granted at market price
Weighted Average Exercise Price, Cancelled or expired	$ 5.20
Weighted Average Exercise Price, Exercised	$ 2.85
Weighted Average Exercise Price, Outstanding, Ending Balance	$ 4.34		$ 4.34
Weighted Average Exercise Price, Options exercisable	$ 4.59		$ 4.59
Weighted Average Remaining Contractual Term, Outstanding	4 years 2 months 19 days
Weighted Average Remaining Contractual Term, Options exercisable	3 years 4 months 17 days

XML

Stock-Based Awards and Stock-Based Employee Compensation Expense (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of All Stock Option Transactions

The following is a summary of all stock option transactions during the three months ended June 30, 2013:

	Options			Weighted Average Exercise Price		Weighted  Average Remaining Contractual Term (Yrs)
Outstanding at March 31, 2013		7,453,060		$	4.32
Granted at market price		—			—
Cancelled or expired		(26,000	)	$	5.20
Exercised		(114,683	)	$	2.85
Outstanding at June 30, 2013		7,312,377		$	4.34		4.22
Options exercisable at June 30, 2013		6,194,048		$	4.59		3.38

Summary of All Restricted Stock Activity

The following is a summary of all restricted stock activity during the three months ended June 30, 2013:

	Restricted Shares		Weighted Average Fair Value
Outstanding at March 31, 2013		736,000	$	2.99
Granted at market price		—		—
Vested		—		—
Cancelled		—		—
Unvested restricted stock at June 30, 2013		736,000	$	2.99

Summary of All Restricted Stock Unit Activity

The following is a summary of all RSU activity during the three months ended June 30, 2013:

	Restricted Stock  Units		Weighted Average Fair Value
Non-vested at March 31, 2013		208,000	$	2.93
Granted at market price		—		—
Vested		—		—
Cancelled		—		—
Unvested restricted stock units at June 30, 2013		208,000	$	2.93

Summary of Stock-Based Employee Compensation Expense

For the three and six month periods ended June 30, 2013, the total stock-based employee compensation expense resulting from stock options, restricted stock, and RSU’s was recorded to the following line items of the Company’s condensed consolidated statements of operations:

(In thousands)	Three Months Ended June  30, 2013		Six Months Ended June  30, 2013
Cost of revenues	$	45	$	87
Research and development		54		106
Selling, general and administrative		345		654
Stock-based compensation expense	$	444	$	847

XML

Stock- Based Awards and Stock-Based Employee Compensation Expense - Summary of Stock-Based Employee Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 444	$ 847
Cost of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	45	87
Research and Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	54	106
Selling, General and Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 345	$ 654

XML

Stock- Based Awards and Stock-Based Employee Compensation Expense - Summary of All Restricted Stock Unit Activity (Detail) (Restricted Stock Units (RSUs) [Member], USD $)	3 Months Ended
	Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares, Outstanding at March 31, 2013	208,000
Restricted Shares, Granted at market price
Restricted Shares, Vested
Restricted Shares, Cancelled
Restricted Shares, Unvested restricted stock at June 30, 2013	208,000
Weighted Average Fair Value, Outstanding at March 31, 2013	$ 2.93
Weighted Average Fair Value, Granted at market price
Weighted Average Fair Value, Vested
Weighted Average Fair Value, Cancelled
Weighted Average Fair Value, Unvested restricted stock at June 30, 2013	$ 2.93

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Common Stock Repurchase Program - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Equity [Abstract]
Share repurchase program authorized amount		$ 15
Shares Repurchased	0	3,080,966
Treasury repurchase program		$ 9

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Earnings Per Share and Potential Dilution - Computations of Basic and Diluted Earnings Per Share (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Basic weighted average shares	61,158,009	61,103,342	61,068,294	62,063,059
Effect of dilutive securities:
Potential dilutive common shares	62,451,546	61,721,859	62,242,401	62,743,297
Stock Options [Member]
Effect of dilutive securities:
Effect of dilutive securities	998,058	618,517	939,781	680,238
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities	226,824		178,956
Restricted Stock Units (RSUs) [Member]
Effect of dilutive securities:
Effect of dilutive securities	68,655		55,370

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Stock- Based Awards and Stock-Based Employee Compensation Expense - Summary of All Restricted Stock Activity (Detail) (Restricted Stock [Member], USD $)	3 Months Ended
	Jun. 30, 2013
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted Shares, Outstanding at March 31, 2013	736,000
Restricted Shares, Granted at market price
Restricted Shares, Vested
Restricted Shares, Cancelled
Restricted Shares, Unvested restricted stock at June 30, 2013	736,000
Weighted Average Fair Value, Outstanding at March 31, 2013	$ 2.99
Weighted Average Fair Value, Granted at market price
Weighted Average Fair Value, Vested
Weighted Average Fair Value, Cancelled
Weighted Average Fair Value, Unvested restricted stock at June 30, 2013	$ 2.99

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating activities:
Net income	$ 2,438	$ 5,069
Non-cash items in net income:
Depreciation and amortization	711	659
Employee stock-based compensation costs	847	458
Non-employee stock-based compensation costs		6
Changes in deferred taxes	59	54
Changes in operating assets and liabilities:
Receivables	(808)	32
Prepaid and other current assets	333	(352)
Accounts payable	70	(62)
Deferred revenue	(98)	1,238
Accrued and other liabilities	(1)	375
Net cash provided by operating activities	3,551	7,477
Investing activities:
Purchases of property and equipment	(948)	(622)
Net cash used in investing activities	(948)	(622)
Financing activities:
Proceeds from exercise of stock options	717	252
Purchase of treasury shares		(9,000)
Net cash provided by (used in) financing activities	717	(8,748)
Increase (decrease) in cash and cash equivalents	3,320	(1,893)
Cash and cash equivalents, beginning of period	22,988	20,680
Cash and cash equivalents, end of period	$ 26,308	$ 18,787

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Recent Accounting Standards and Pronouncements

6 Months Ended

Jun. 30, 2013

Accounting Changes And Error Corrections [Abstract]

Recent Accounting Standards and Pronouncements

2. Recent Accounting Standards and Pronouncements

Presentation of Other Comprehensive Income

In February 2013, the FASB issued guidance that requires entities to provide information about the amounts reclassified out of accumulated other comprehensive income by component and to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. This new guidance did not have an impact on our condensed consolidated financial statements.

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Receivables, net

6 Months Ended

Jun. 30, 2013

Receivables [Abstract]

Receivables, net

5. Receivables, net

(In thousands)	June 30, 2013			December 31, 2012
Receivables	$	1,875		$	995
Allowance for returns and doubtful accounts		(100	)		(28	)
Note receivable		458			458
Allowance for note receivable		(458	)		(458	)
Receivables, net	$	1,775		$	967

The allowance for doubtful accounts includes all specific accounts receivable which we believe are likely not collectible based on known information. In addition, we record 2.5% of all accounts receivable greater than 90 days past due, net of those accounts specifically reserved, as a general allowance against accounts that could potentially become uncollectible.

The note receivable represents the remaining outstanding balance of an original note related to the sale of a product line in 2005 in the amount of $540 thousand. This was fully reserved at the time of the sale as the note’s collectability was not assured. The note receivable is fully reserved at June 30, 2013.

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Stock-Based Awards and Stock-Based Employee Compensation Expense

6 Months Ended

Jun. 30, 2013

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Awards and Stock-Based Employee Compensation Expense

3. Stock- Based Awards and Stock-Based Employee Compensation Expense

Our stock-based awards include stock options, restricted stock, and restricted stock units (“RSU’s”). As of June 30, 2013, the Company had 7,312,377 stock options outstanding and 505,346 shares available for grant.

Stock Option Activity

There were 114,683 and 324,120 stock options exercised for the three and six month periods ended June 30, 2013, respectively. There were 130,268 and 142,368 stock options exercised for the three and six month periods ended June 30, 2012. There was a $30 thousand excess tax benefit recorded in the three month period ended June 30, 2013, related to the 114,683 option exercises. The excess tax benefit recorded in the six month period ended June 30, 2013, related to the 324,120 option exercises was $47 thousand. A deferred tax asset totaling $167 thousand and $136 thousand, resulting from stock-based compensation expense associated with options relating to the Company’s U.S. operations, was recorded for the six month periods ended June 30, 2013 and 2012, respectively.

The following is a summary of all stock option transactions during the three months ended June 30, 2013:

	Options			Weighted Average Exercise Price		Weighted  Average Remaining Contractual Term (Yrs)
Outstanding at March 31, 2013		7,453,060		$	4.32
Granted at market price		—			—
Cancelled or expired		(26,000	)	$	5.20
Exercised		(114,683	)	$	2.85
Outstanding at June 30, 2013		7,312,377		$	4.34		4.22
Options exercisable at June 30, 2013		6,194,048		$	4.59		3.38

At June 30, 2013, we had 4,349,819 stock options outstanding and 3,231,490 options exercisable in which the exercise price was lower than the market price of the Company’s common stock. The aggregate intrinsic value of these options was $6.4 million and $5.0 million, respectively.

For additional information regarding the Company’s Stock Options and Stock-based Employee Compensation, see Note 4 to the consolidated financial statements contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2012.

Restricted Stock Activity

The following is a summary of all restricted stock activity during the three months ended June 30, 2013:

	Restricted Shares		Weighted Average Fair Value
Outstanding at March 31, 2013		736,000	$	2.99
Granted at market price		—		—
Vested		—		—
Cancelled		—		—
Unvested restricted stock at June 30, 2013		736,000	$	2.99

Restricted Stock Unit Activity

The following is a summary of all RSU activity during the three months ended June 30, 2013:

	Restricted Stock  Units		Weighted Average Fair Value
Non-vested at March 31, 2013		208,000	$	2.93
Granted at market price		—		—
Vested		—		—
Cancelled		—		—
Unvested restricted stock units at June 30, 2013		208,000	$	2.93

The weighted average grant-date fair value of awards of restricted stock and RSU’s (collectively “restricted stock”) is based on the quoted market price of the Company’s common stock on the date of grant.

Stock-Based Compensation Expense

For the three and six month periods ended June 30, 2013, the total stock-based employee compensation expense resulting from stock options, restricted stock, and RSU’s was recorded to the following line items of the Company’s condensed consolidated statements of operations:

(In thousands)	Three Months Ended June  30, 2013		Six Months Ended June  30, 2013
Cost of revenues	$	45	$	87
Research and development		54		106
Selling, general and administrative		345		654
Stock-based compensation expense	$	444	$	847

As of June 30, 2013, there was $4.3 million of total unrecognized stock-based compensation related to non-vested stock-based compensation awards granted under the incentive plans. This cost is expected to be recognized over a weighted average period of 1.77 years.

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Supplemental Cash Flow Information - Supplemental Cash Flow Information Relating to Taxes (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash Flow Information Relating To Interest Taxes And Non Cash Activities [Abstract]
Cash income tax payments	$ 118	$ 214

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Earnings Per Share and Potential Dilution - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities	4,701,116	5,596,445	4,974,599	5,330,568
Restricted Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities			62,562
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Effect of dilutive securities			15,438

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 1	$ 1
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	175,000,000	175,000,000
Common stock, shares issued	73,874,553	73,165,433
Common stock, shares outstanding	61,973,653	61,264,533
Treasury stock, shares	11,900,900	11,900,900

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Fair Value Measurements

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

8. Fair Value Measurements

FASB guidance regarding fair value measurement establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than quoted prices for similar assets and liabilities in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions.

For certain of the Company’s financial instruments, including cash and cash equivalents, trade receivables, and accounts payable, the fair values approximate carrying values due to the short-term maturities of these instruments. The carrying values of other current assets and accrued expenses are also not recorded at fair value, but approximate fair values primarily due to their short-term nature.

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CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Accumulated Deficit [Member]
Beginning balance at Dec. 31, 2012	$ 61,245	$ 728	$ 355,747	$ (41,506)	$ (253,724)
Beginning balance, shares at Dec. 31, 2012		73,165,433
Issuance of common stock upon exercise of stock options	717	3	714
Issuance of common stock upon exercise of stock options, shares	324,120	324,120
Issuance of restricted common stock, shares		385,000
Employee stock-based compensation costs	847		847
Net income	2,438				2,438
Ending balance at Jun. 30, 2013	$ 65,247	$ 731	$ 357,308	$ (41,506)	$ (251,286)
Ending balance, shares at Jun. 30, 2013		73,874,553

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CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 26,308	$ 22,988
Receivables, net	1,775	967
Prepaid and other current assets	1,364	1,697
Deferred tax assets	1,608	1,600
Total current assets	31,055	27,252
Property and equipment, net	2,587	2,384
Goodwill	2,161	2,161
Deferred tax assets	50,985	51,052
Total assets	86,788	82,849
Current liabilities:
Accounts payable	537	501
Accrued expenses	2,649	2,655
Deferred revenue	17,317	17,470
Total current liabilities	20,503	20,626
Long-term liabilities:
Deferred revenue	957	902
Deferred rent	81	76
Total long-term liabilities	1,038	978
Total liabilities	21,541	21,604
Commitments and contingencies (see Note 7)
Stockholders' equity:
Preferred stock, $1 par value, 10,000,000 shares authorized; none issued and outstanding
Common stock, $0.01 par value, 175,000,000 shares authorized; 73,874,553 issued and 61,973,653 outstanding in 2013 and 73,165,433 issued and 61,264,533 outstanding in 2012	731	728
Additional paid-in capital	357,308	355,747
Treasury stock, at cost; 11,900,900 common shares in 2013 and 11,900,900 common shares in 2012	(41,506)	(41,506)
Accumulated deficit	(251,286)	(253,724)
Total stockholders' equity	65,247	61,245
Total liabilities and stockholders' equity	$ 86,788	$ 82,849

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Receivables, Net - Summary of Net Receivables (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Accounts Notes And Loans Receivable Net Current [Abstract]
Receivables	$ 1,875	$ 995
Allowance for returns and doubtful accounts	(100)	(28)
Note receivable	458	458
Allowance for note receivable	(458)	(458)
Receivables, net	$ 1,775	$ 967

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Stock- Based Awards and Stock-Based Employee Compensation Expense - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	7,312,377		7,312,377		7,453,060
Shares available for grant	505,346		505,346
Stock options exercised	114,683	130,268	324,120	142,368
Tax benefit from stock option exercised	$ 30,000		$ 47,000
Deferred tax assets, tax deferred expense compensation and benefits employee compensation	167,000	136,000	167,000	136,000
Options, Options Exercisable	6,194,048		6,194,048
Total unrecognized stock-based compensation related to non-vested stock-based compensation awards	4,300,000		4,300,000
Number of years over which cost is expected to be recognized	1 year 9 months 7 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	4,349,819		4,349,819
Options, Options Exercisable	3,231,490		3,231,490
Aggregate Intrinsic Value of Options Outstanding	6,400,000		6,400,000
Aggregate Intrinsic Value of Options Exercisable	$ 5,000,000		$ 5,000,000

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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Change valuation allowance related to deferred tax assets	$ 2.3

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Commitments and contingencies

6 Months Ended

Jun. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Commitments and contingencies

7. Commitments and contingencies

A summary of our fixed contractual obligations and commitments at June 30, 2013, is as follows:

	Payments Due by Period
(In thousands)	Total		1 Year		Years 2 & 3		Years 4 & 5		Beyond 5 Years
Operating leases	$	11,683	$	604	$	2,269	$	2,110	$	6,700

We have not entered into any material, non-cancelable purchase commitments at June 30, 2013.

Claims and Proceedings

We may be subject to legal claims, litigation, and other legal proceedings. The expenses of those matters could be significant. There is no current or pending material legal proceeding. We expect no adverse effect on our operations or financial results as a result of the cost or other impacts of concluded legal proceedings.

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Receivables, Net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Receivables [Abstract]
Percentage of Doubtful Debts on Accounts Receivable	2.50%
Note receivable on a product line	$ 540
Date of note receivable, reserved	Jun. 30, 2013

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Income Taxes

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

10. Income Taxes

At the end of 2012, the Company recorded a $2.3 million tax benefit by reducing the valuation allowance related to its deferred tax assets. This reduction was determined through an assessment of future deferred tax asset utilization following accounting guidance which relies largely on historical earnings. Using the same methodology, and updating the future taxable earnings estimates based on first and second quarter 2013 actual earnings, the Company believes its future U.S. federal taxable earnings estimate to be established at the end of 2013 will exceed the estimate used at the end of 2012. For this reason, the Company offset its first and second quarter 2013 federal deferred tax provision by reducing its valuation allowance by an equal amount, thereby eliminating from its deferred tax provision federal taxes in excess of the estimated Alternative Minimum Tax from the Company’s first and second quarter 2013 financial statements. The Company expects to follow this same methodology in the third quarter of 2013 and will reevaluate the need for its valuation allowance at December 31, 2013, following the same assessment that was performed at December 31, 2012.

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Earnings Per Share and Potential Dilution

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Earnings Per Share and Potential Dilution

6. Earnings Per Share and Potential Dilution

Basic earnings per share are computed using the weighted average number of common shares outstanding for the period. The dilutive effect of potential common shares outstanding is included in diluted earnings per share. The computations for basic and diluted earnings per share for the three and six months ended June 30, 2013 and 2012, are as follows:

	Three Months ended June 30,				Six Months ended June 30,
	2013		2012		2013		2012
Basic weighted average shares		61,158,009		61,103,342		61,068,294		62,063,059
Effect of dilutive securities:
Employee and director stock options		998,058		618,517		939,781		680,238
Restricted stock		226,824		—		178,956		—
RSU’s		68,655		—		55,370		—
Potential dilutive common shares		62,451,546		61,721,859		62,242,401		62,743,297

During the three months ended June 30, 2013, weighted average shares related to 4,701,116 stock options were excluded from the calculation of diluted earnings per share because the exercise price of the awards was in excess of the market price and such awards are therefore anti-dilutive. During the six months ended June 30, 2013, weighted average shares related to 4,974,599 stock options, 62,562 shares of restricted stock, and 15,438 RSU’s were excluded from the calculation of diluted earnings per share because the exercise price of the awards was in excess of the market price and such awards are therefore anti-dilutive. During the three and six months ended June 30, 2012, weighted average shares of 5,596,445 and 5,330,568, respectively, related to stock options were excluded from the calculation of diluted earnings per share because the stock options were similarly anti-dilutive.

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Basis of Presentation

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Basis of Presentation

1. Basis of Presentation

The accompanying condensed consolidated financial statements of Zix Corporation (“ZixCorp,” the “Company,” “we,” “our,” “us”) should be read in conjunction with the audited consolidated financial statements included in the Company’s 2012 Annual Report on Form 10-K. These financial statements are unaudited, but have been prepared in the ordinary course of business for the purpose of providing information with respect to the covered interim periods. Management of the Company believes that all adjustments necessary for a fair presentation for such periods have been included and are of a normal recurring nature. The results of operations for the six-month period ended June 30, 2013, are not necessarily indicative of the results to be expected for any future periods or for the full fiscal year.

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Commitments and Contingencies - Summary of Fixed Contractual Obligations and Commitments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013
Operating Leases Future Minimum Payments Due [Abstract]
Operating leases	$ 11,683
Operating leases, First Year	604
Operating leases Two and Three Years	2,269
Operating leases Four and Five Years	2,110
Operating leases, Beyond Five Years	$ 6,700

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Supplemental Cash Flow Information (Tables)

6 Months Ended

Jun. 30, 2013

Supplemental Cash Flow Elements [Abstract]

Supplemental Cash Flow Information Relating to Taxes

Supplemental cash flow information relating to taxes:

	Six Months Ended June 30,
(In thousands)	2013		2012
Cash income tax payments	$	118	$	214

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Common Stock Repurchase Program

6 Months Ended

Jun. 30, 2013

Equity [Abstract]

Common Stock Repurchase Program

9. Common Stock Repurchase Program

During the six months ended June 30, 2012, the Company repurchased 3,080,966 shares at an aggregate cost of $9.0 million under a $15 million share repurchase program authorized by our board of directors announced November 9, 2011. This repurchase program was completed during the three months ended June 30, 2012. No stock repurchases have occurred during the six-month period ending June 30, 2013.

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Commitments and contingencies (Tables)

6 Months Ended

Jun. 30, 2013

Commitments And Contingencies Disclosure [Abstract]

Summary of Fixed Contractual Obligations and Commitments

A summary of our fixed contractual obligations and commitments at June 30, 2013, is as follows:

	Payments Due by Period
(In thousands)	Total		1 Year		Years 2 & 3		Years 4 & 5		Beyond 5 Years
Operating leases	$	11,683	$	604	$	2,269	$	2,110	$	6,700

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Receivables, net (Tables)

6 Months Ended

Jun. 30, 2013

Receivables [Abstract]

Summary of Net Receivables

(In thousands)	June 30, 2013			December 31, 2012
Receivables	$	1,875		$	995
Allowance for returns and doubtful accounts		(100	)		(28	)
Note receivable		458			458
Allowance for note receivable		(458	)		(458	)
Receivables, net	$	1,775		$	967

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Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 02, 2013
Document Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	ZIXI
Entity Registrant Name	ZIX CORP
Entity Central Index Key	0000855612
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		61,998,860

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Earnings Per Share and Potential Dilution (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Computations of Basic and Diluted Earnings Per Share

The computations for basic and diluted earnings per share for the three and six months ended June 30, 2013 and 2012, are as follows:

	Three Months ended June 30,				Six Months ended June 30,
	2013		2012		2013		2012
Basic weighted average shares		61,158,009		61,103,342		61,068,294		62,063,059
Effect of dilutive securities:
Employee and director stock options		998,058		618,517		939,781		680,238
Restricted stock		226,824		—		178,956		—
RSU’s		68,655		—		55,370		—
Potential dilutive common shares		62,451,546		61,721,859		62,242,401		62,743,297