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Share-based Compensation (Tables)
 3 Months Ended
Mar. 31, 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
March 31,
  
2018
 
2017
Cost of revenues
$
54

 
$
54

Research and development
215

 
199

Sales and marketing
309

 
129

General and administrative
564

 
709

Total
$
1,142

 
$
1,091
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
170,642

Exercised
(471,792
)
Canceled
(322,480
)
Outstanding — March 31, 2018
5,942,853

Exercisable — March 31, 2018
1,929,868
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
258,863

Vested
(179,718
)
Forfeited
(58,543
)
Non-vested — March 31, 2018
1,076,579