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Share-based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
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,
  
2018
 
2017
 
2018
 
2017
Cost of revenues
$
153

 
$
35

 
$
227

 
$
130

Research and development
564

 
225

 
972

 
541

Sales and marketing
313

 
320

 
761

 
536

General and administrative
704

 
214

 
1,718

 
1,566

Restructuring
—

 
169

 
—

 
169

Total
$
1,734

 
$
963

 
$
3,678

 
$
2,942
Summary of Stock Option Activity
The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2017
6,566,483

Granted
4,248,142

Exercised
(1,172,996
)
Canceled
(1,164,750
)
Outstanding — September 30, 2018
8,476,879

Exercisable — September 30, 2018
3,141,297
Summary of Restricted Stock Unit Activity
The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2017
1,055,977

Granted
919,226

Vested
(1,106,238
)
Forfeited
(451,954
)
Non-vested — September 30, 2018
417,011