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Share-based Compensation
 9 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [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
September 30,
 
Nine Months Ended
September 30,
  
2019
 
2018
 
2019
 
2018
Cost of revenues
$
202

 
$
153

 
$
899

 
$
227

Research and development
183

 
564

 
1,315

 
972

Sales and marketing
307

 
313

 
1,339

 
761

General and administrative
561

 
704

 
2,402

 
1,718

Total
$
1,253

 
$
1,734

 
$
5,955

 
$
3,678


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

Granted
1,327,757

Exercised
(734,214
)
Canceled
(866,105
)
Outstanding — September 30, 2019
8,523,650

Exercisable — September 30, 2019
3,955,128


At September 30, 2019, total unrecognized compensation expense related to stock options was $6.2 million, which is expected to be recognized over a weighted-average period of 2.79 years.
Restricted Stock Units
The following table summarizes the Company’s restricted stock unit (“RSU”) activity:
Non-vested — December 31, 2018
454,382

Granted
781,067

Vested
(791,234
)
Forfeited
(68,825
)
Non-vested — September 30, 2019
375,390


At September 30, 2019, total unrecognized compensation expense related to RSUs was $0.6 million, which is expected to be recognized over a weighted-average period of 1.13 years.