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Share-based Compensation
 6 Months Ended
Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation 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,
  
2019
 
2018
 
2019
 
2018
Cost of revenues
$
574

 
$
20

 
$
697

 
$
74

Research and development
957

 
193

 
1,132

 
408

Sales and marketing
818

 
235

 
1,032

 
448

General and administrative
1,296

 
616

 
1,841

 
1,014

Total
$
3,645

 
$
1,064

 
$
4,702

 
$
1,944


Stock Options
The following table summarizes the Company’s stock option activity:
Outstanding — December 31, 2018
8,796,212

Granted
825,757

Exercised
(414,792
)
Canceled
(666,318
)
Outstanding — June 30, 2019
8,540,859

Exercisable — June 30, 2019
2,868,281


At June 30, 2019, total unrecognized compensation expense related to stock options was $5.8 million, which is expected to be recognized over a weighted-average period of 2.59 years.
Restricted Stock Units
The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2018
454,382

Granted
273,867

Vested
(275,534
)
Forfeited
(48,750
)
Non-vested — June 30, 2019
403,965


At June 30, 2019, total unrecognized compensation expense related to RSUs was $0.8 million, which is expected to be recognized over a weighted-average period of 1.41 years.