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Share-based Compensation (Tables)
 6 Months Ended
Jun. 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
June 30,
 
Six Months Ended
June 30,
  
2018
 
2017
 
2018
 
2017
Cost of revenues
$
20

 
$
41

 
$
74

 
$
95

Research and development
193

 
117

 
408

 
316

Sales and marketing
139

 
87

 
448

 
216

General and administrative
450

 
643

 
1,014

 
1,352

Total
$
802

 
$
888

 
$
1,944

 
$
1,979
Summary of Stock Option Activity
The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2016
6,356,203

Granted
3,877,000

Exercised
(146,039
)
Canceled
(3,520,681
)
Outstanding — December 31, 2017
6,566,483

Granted
1,795,642

Exercised
(620,350
)
Canceled
(920,564
)
Outstanding — June 30, 2018
6,821,211

Exercisable — June 30, 2018
2,524,208
Summary of Restricted Stock Unit Activity
The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2016
2,975,800

Granted
1,480,301

Vested
(1,193,721
)
Forfeited
(2,206,403
)
Non-vested — December 31, 2017
1,055,977

Granted
384,912

Vested
(546,308
)
Forfeited
(399,293
)
Non-vested — June 30, 2018
495,288