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Noncash Share-based Compensation (Note) | 6 Months Ended
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Jun. 30, 2015
Noncash Share-based Compensation [Abstract] |
Noncash Share-based Compensation | Noncash Share-based Compensation During the three months ended June 30, 2015, the Company granted 44,480 shares of RSUs with a weighted average grant-date fair value of $20.10 per share. The Company did not grant any stock options, SARs or MSUs during the three months ended June 30, 2015. During the six months ended June 30, 2015, the Company granted 936,730 shares of RSUs with a weighted average grant-date fair value of $25.47 per share. The Company granted 131,400 MSUs with a weighted average grant-date fair value of $32.45 to certain executive employees during the six months ended June 30, 2015. These MSUs vest on January 1, 2018 and March 3, 2018, respectively, and the actual number of MSUs that will be eligible to vest is based on the total stockholder return of the Company relative to the total stockholder return of the Index over the Performance Period, as defined by each award's plan documents or individual award agreements. The Company did not grant any stock options or SARs during the six months ended June 30, 2015. Share-based compensation expense is allocated to expense categories on the unaudited condensed consolidated statements of comprehensive income. The following table summarizes share-based compensation expense included in the Company's unaudited condensed consolidated statements of comprehensive income for the three and six months ended June 30, 2015 and 2014:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Share-based compensation: |  |  |  |  |  |  |
Cost of revenue | $ | 1,031 |  |  | $ | 959 |  |  | $ | 2,044 |  |  | $ | 1,681 |
Operating expenses: |  |  |  |  |  |  |
Selling and marketing | 2,280 |  |  | 1,736 |  |  | 4,312 |  |  | 2,925 |
General and administrative | 2,372 |  |  | 2,034 |  |  | 5,720 |  |  | 3,517 |
Research and development | 1,322 |  |  | 1,216 |  |  | 2,674 |  |  | 2,181 |
Total included in operating expenses | 5,974 |  |  | 4,986 |  |  | 12,706 |  |  | 8,623 |
Total share-based compensation expense | $ | 7,005 |  |  | $ | 5,945 |  |  | $ | 14,750 |  |  | $ | 10,304 |
In January 2015, the number of shares available for issuance increased by 900,000 to 9,068,000 under an evergreen provision in the Company's 2007 Equity Incentive Plan ("2007 Stock Plan"). As of June 30, 2015, 898,412 shares remained available for issuance under the 2007 Stock Plan. At June 30, 2015, the Company had an estimated $56.4 million of total unrecognized compensation costs related to share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.7 years. In June 2013, the Board of Directors authorized an Employee Stock Purchase Plan ("ESPP") which provides for eligible employees to purchase shares on an after-tax basis in an amount between 1% and 10% of their annual pay: (i) on June 30 of each year at a 5% discount of the fair market value of our common stock on January 1 or June 30, whichever is lower, and (ii) on December 31 of each year at a 5% discount of the fair market value of our common stock on July 1 or December 31, whichever is lower. An employee may not purchase more than $5,000 in either of the six-month measurement periods described above or more than $10,000 annually. During the quarter ended June 30, 2015, the Company issued no shares under the ESPP. As of June 30, 2015, 471,815 shares remain authorized and available for issuance under the ESPP. As of June 30, 2015, the Company held approximately $0.5 million on behalf of employees for future purchases under the ESPP, and this amount was recorded in accrued liabilities in the Company's unaudited condensed consolidated balance sheet.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51659978&loc=d3e25284-112666 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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