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Share-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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
September 30,
 
Nine Months Ended
September 30,
  
2017
 
2016
 
2017
 
2016
Cost of revenues
$
35

 
$
49

 
$
130

 
$
156

Research and development
225

 
201

 
541

 
662

Sales and marketing
320

 
170

 
536

 
593

General and administrative
214

 
695

 
1,566

 
2,026

Restructuring
169

 
—

 
169

 
—

Total
$
963

 
$
1,115

 
$
2,942

 
$
3,437
Summary of Stock Option Activity
The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2015
6,084,836

Granted
1,051,550

Exercised
(78,384
)
Canceled
(701,799
)
Outstanding — December 31, 2016
6,356,203

Granted
3,877,000

Exercised
—

Canceled
(3,238,251
)
Outstanding — September 30, 2017
6,994,952

Exercisable — September 30, 2017
2,338,157
Summary of Restricted Stock Unit Activity
The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2015
960,203

Granted
2,914,000

Vested
(461,866
)
Forfeited
(436,537
)
Non-vested — December 31, 2016
2,975,800

Granted
1,480,301

Vested
(1,162,453
)
Forfeited
(2,134,777
)
Non-vested — September 30, 2017
1,158,871