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Share-based Compensation
 6 Months Ended
Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation
Share-based Compensation
The Company included the following amounts for share-based compensation awards in the unaudited condensed consolidated statements of operations (in thousands):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
  
2016
 
2015
 
2016
 
2015
Cost of revenues
$
55

 
$
37

 
$
107

 
$
58

Research and development
212

 
187

 
461

 
402

Sales and marketing
213

 
143

 
423

 
183

General and administrative
776

 
816

 
1,331

 
1,330

Total
$
1,256

 
$
1,183

 
$
2,322

 
$
1,973


Stock Options
The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2014
3,064,880

Granted
6,656,737

Exercised
(273,005
)
Canceled
(3,363,776
)
Outstanding — December 31, 2015
6,084,836

Granted
1,051,550

Exercised
(9,568
)
Canceled
(392,577
)
Outstanding — June 30, 2016
6,734,241

Exercisable — June 30, 2016
1,554,152


At June 30, 2016, total unrecognized compensation expense related to stock options was $6.1 million, which is expected to be recognized over a weighted-average period of 3.04 years.
Restricted Stock Units
The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested at December 31, 2014
1,628,179

Granted
1,042,659

Vested
(926,308
)
Forfeited
(784,327
)
Non-vested at December 31, 2015
960,203

Granted
2,914,000

Vested
(342,123
)
Forfeited
(54,028
)
Non-vested at June 30, 2016
3,478,052


At June 30, 2016, total unrecognized compensation expense related to RSUs was $5.4 million, which is expected to be recognized over a weighted-average period of 3.17 years.
Employee Stock Purchase Plan
During the three months ended June 30, 2016 and 2015, the Company recognized $0.1 million and $0.1 million, respectively, of stock-based compensation expense related to the employee stock purchase plan (the “ESPP”). During the six months ended June 30, 2016 and 2015, the Company recognized $0.2 million and $0.2 million, respectively, of stock-based compensation expense related to the ESPP.