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Stock-Based Awards and Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Option Activity and Stock Options Outstanding
Certain information regarding stock option activity and stock options outstanding as of December 31, 2015 was as follows:

 
Shares
Available
for Grant
 
Outstanding
Stock
Options
 
Weighted
average
exercise
price
 
Weighted
average
remaining
life
(in years)
 
Aggregate
intrinsic
value
(in
thousands)
Balances, December 31, 2014
3,389,132

 
7,329,575

 
$
5.97

 
 
 
 
Additional shares reserved
2,870,538

 
 
 
 
 
 
 
 
Stock options granted
(2,440,695
)
 
2,440,695

 
5.37

 
 
 
 
Forfeited – stock options
1,703,380

 
(1,703,380
)
 
9.73

 
 
 
 
Exercised – stock options exercised
 
 
(1,089,933
)
 
1.22

 
 
 
 
Granted – RSUs
(3,914,358
)
 
 
 
 
 
 
 
 
Forfeited – RSUs
1,574,637

 
 
 
 
 
 
 
 
Forfeited – PSUs
250,000

 
 
 
 
 
 
 
 
Vested RSUs adjusted for taxes
209,532

 
 
 
 
 
 
 
 
Balances, December 31, 2015
3,642,166

 
6,976,957

 
$
5.59

 
5.55
 
$
6,878

Exercisable at December 31, 2015
 
 
4,633,363

 
$
5.48

 
3.65
 
$
6,876

Vested and expected to vest
 
 
6,744,707

 
$
5.58

 
5.39
 
$
6,878
Schedule of Restricted Stock Activity
Restricted stock activity was as follows:
 
Number
of shares
 
Weighted average
grant date
fair value
Balances, December 31, 2014
4,043,912

 
$
11.21

Granted RSUs
3,914,358

 
5.39

Vested RSUs
(1,635,341
)
 
10.82

Forfeited RSUs
(1,574,637
)
 
9.72

Forfeited PSUs
(250,000
)
 
8.12

Balances, December 31, 2015
4,498,292

 
6.98
Schedule of Black-Scholes-Merton Option-Pricing Model with Weighted Average Assumptions
The fair value of the stock-based options granted to employees was estimated using the Black-Scholes-Merton option-pricing model with the following weighted average assumptions:
 
Year Ended December 31,
 
2015
 
2014
 
2013
Expected term (in years)
6.0

 
6.0

 
5.9

Risk-free interest rate
1.75
%
 
1.83
%
 
1.09
%
Volatility
50.62
%
 
50.43
%
 
52.17
%
Dividend yield
—
%
 
—
%
 
—
%
Schedule of Weighted Average Assumptions, ESPP
The following weighted average assumptions were used to estimate the fair value of ESPP shares in the periods presented:
 
Year Ended December 31,
 
2015
 
2014
 
2013
Expected term (in years)
0.7

 
0

 
0

Risk-free interest rate
0.41
%
 
—
%
 
—
%
Volatility
36.20
%
 
—
%
 
—
%
Dividend yield
—
%
 
—
%
 
—
%
Schedule of Stock-Based Compensation
Certain information regarding our stock-based compensation was as follows (in thousands, except per share data):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Weighted average per share grant date fair value of stock options granted
$
2.65

 
$
3.68

 
$
7.57

Weighted average per share grant date fair value of ESPP purchase rights
$
1.32

 
$
—

 
$
—

Total intrinsic value of stock options exercised
$
4,444

 
$
12,573

 
$
36,367

Total fair value of restricted stock and stock options vested
$
19,320

 
$
38,071

 
$
21,045
Stock-Based Compensation Expense Included in Consolidated Statements of Operations
Stock-based compensation was included in our Consolidated Statements of Operations as follows (in thousands): 
 
Year Ended December 31,
 
2015
 
2014
 
2013
Cost of revenues
$
3,029

 
$
4,276

 
$
3,450

Research and development
7,078

 
10,642

 
14,133

Sales and marketing
3,775

 
10,852

 
10,614

General and administrative
6,423

 
7,138

 
6,557

Total
$
20,305

 
$
32,908

 
$
34,754

Stock-based compensation related to non-employee awards (included in total stock-based compensation above)
$
—

 
$
41

 
$
488

Stock-based compensation capitalized related to the development of internal-use software
$
—

 
$
1,370

 
$
—