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Noncash Share-based Compensation (Note)
 6 Months Ended
Jun. 30, 2016
Noncash Share-based Compensation [Abstract]  
Noncash Share-based Compensation
Noncash Share-based Compensation

During the three months ended June 30, 2016, the Company granted 765,260 RSUs with a weighted average grant-date fair value of $11.19 per share. The Company did not grant any stock options, SARs or MSUs during the three months ended June 30, 2016.

During the six months ended June 30, 2016, the Company granted 1,317,642 RSUs with a weighted average grant-date fair value of $11.41 per share. The Company granted 152,500 MSUs with a weighted average grant-date fair value of $14.29 to certain executive employees during the six months ended June 30, 2016. These MSUs vest on March 1, 2019 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, 2016.

Share-based compensation expense is allocated to expense categories on the unaudited condensed consolidated statements of comprehensive income (loss). The following table summarizes share-based compensation expense included in the Company's unaudited condensed consolidated statements of comprehensive income (loss) for the three and six months ended June 30, 2016 and 2015:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015
Share-based compensation:
 
 
 
 
 
 
 
Cost of revenue
$
577

 
$
1,031

 
$
1,176

 
$
2,044

Operating expenses:
 
 
 
 
 
 
 
Selling and marketing
1,697

 
2,280

 
3,477

 
4,312

General and administrative
2,302

 
2,372

 
4,032

 
5,720

Research and development
1,293

 
1,322

 
2,568

 
2,674

Total included in operating expenses
5,292

 
5,974

 
10,077

 
12,706

Total share-based compensation expense
$
5,869

 
$
7,005

 
$
11,253

 
$
14,750


    
In January 2016, the number of shares available for issuance increased by 900,000 to 9,968,000 under an evergreen provision in the Company's 2007 Equity Incentive Plan ("2007 Stock Plan"). As of June 30, 2016, 1,043,938 shares remained available for issuance under the 2007 Stock Plan.
    
At June 30, 2016, the Company had an estimated $43.7 million of total unrecognized compensation costs related to share-based compensation arrangements. These costs will be recognized over a weighted average period of 2.5 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 the Company's 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 the Company's 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. In November 2015, the Board of Directors amended the ESPP plan to increase the discount to 15% of the fair market value of the Company's common stock effective January 1, 2016. The amendment did not change the accounting treatment of the ESPP plan. During the six months ended June 30, 2016, the Company issued 23,848 shares under the ESPP. As of June 30, 2016, 425,155 shares remain authorized and available for issuance under the ESPP. As of June 30, 2016, the Company held approximately $0.6 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.