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Share-based Compensation (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
  
2017
 
2016
 
2017
 
2016
Cost of revenues
$
41

 
$
55

 
$
95

 
$
107

Research and development
117

 
212

 
316

 
461

Sales and marketing
87

 
213

 
216

 
423

General and administrative
643

 
776

 
1,352

 
1,331

Total
$
888

 
$
1,256

 
$
1,979

 
$
2,322
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
1,150,000

Exercised
—

Canceled
(2,060,651
)
Outstanding — June 30, 2017
5,445,552

Exercisable — June 30, 2017
3,285,389
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
(990,150
)
Forfeited
(1,623,548
)
Non-vested — June 30, 2017
1,842,403