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Stock-Based Compensation
9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation

Equity Incentive Plan
As of September 30, 2018, 892,827 stock options and awards remained available for future grant under the 2016 Equity Incentive Plan. No other plans had options or awards available for grant.  
 
The Company recorded stock-based compensation in the condensed consolidated statements of operations and comprehensive loss as follows (in thousands):
 
 
Three Months Ended September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Cost of revenue
$
28

 
$
30

 
68

 
83

Research and development
307

 
118

 
859

 
315

Selling, general and administrative
672

 
875

 
2,683

 
1,704

Total
$
1,007

 
$
1,023

 
$
3,610

 
$
2,102


 
Unrecognized compensation expense at September 30, 2018 was approximately $6.6 million, which is expected to be recognized over a weighted-average term of 2.0 years.
Incentive Stock Options
The following table summarizes stock option transactions for the 2016 Equity Incentive Plan for the nine months ended September 30, 2018 (in thousands, except shares and per share data):
 
 
Number of
shares
 
Weighted-
average
exercise
price per share
 
Weighted-
average
remaining
contractual
life (in
years)
 
Aggregate
intrinsic
value (in
thousands)
Outstanding at December 31, 2017
2,979,285

 
$
6.49

 
 
 
 

Options granted
1,565,864

 
4.92

 
 
 
 

Options exercised
(26,003
)
 
1.46

 
 
 
 

Options canceled
(957,238
)
 
6.32

 
 
 
 

Outstanding at September 30, 2018
3,561,908

 
$
5.88

 
7.8
 
$
1,194

Vested and expected to vest at September 30, 2018
3,327,958

 
$
5.85

 
7.8
 
$
1,168

Vested and exercisable at September 30, 2018
1,662,409

 
$
5.93

 
6.6
 
$
845


 
Restricted Stock Awards
The following table summarizes restricted stock award transactions for the 2016 Equity Incentive Plan for the nine months ended September 30, 2018:
 
Number of
awards
 
Weighted-
average
grant date fair value
Outstanding at December 31, 2017
413,000

 
$
9.98

Awards granted
425,942

 
4.10

Awards vested

 

Awards canceled
(212,000
)
 
10.00

Outstanding at September 30, 2018
626,942

 
$
5.99