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Stock-based Awards
 3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock based awards
Stock-based Awards
Stock Options
A summary of the Company’s stock option activity for the three months ended March 31, 2017 is as follows:
 
Number of
Options
 
Weighted-Average Exercise Price
 
Weighted-Average
Remaining
Contractual Life
 
 
 
 
 
(in years)
Outstanding at December 31, 2016
24,541,512

 
$
8.29

 
5.49
Granted
350,010

 
13.94

 
 
Exercised
(2,637,730
)
 
3.16

 
 
Canceled/forfeited
(431,062
)
 
7.99

 
 
Outstanding at March 31, 2017
21,822,730

 
$
9.01

 
5.66

At March 31, 2017, total remaining stock-based compensation expense for unvested stock option awards was $30.5 million, which is expected to be recognized over a weighted-average period of 2.9 years. For the three months ended March 31, 2017 and 2016, the Company recorded stock-based compensation expense for stock option awards of $3.3 million and $3.8 million, respectively.
Restricted Stock Units
Activity in connection with restricted stock units is as follows for the three months ended March 31, 2017:
 
Number of
Shares
 
Weighted- Average Grant Date Fair Value
Non-vested — December 31, 2016
4,339,320

 
$
7.85

Granted
185,242

 
14.03

Vested
(348,349
)
 
8.18

Canceled/forfeited
(161,112
)
 
7.14

Non-vested — March 31, 2017
4,015,101

 
$
8.13


At March 31, 2017, total remaining stock-based compensation expense for non-vested restricted stock units is $29.5 million, which is expected to be recognized over a weighted-average period of 2.9 years. The Company recorded $2.6 million and $2.1 million in stock-based compensation expense for restricted stock units for the three months ended March 31, 2017 and 2016, respectively.
Stock-based Compensation Cost
The Company recorded stock-based compensation cost relating to stock options and restricted stock awards in the following categories on the accompanying consolidated statements of comprehensive loss (in thousands):
 
Three Months Ended 
 March 31,
 
2017
 
2016
 
 
 
 
Cost of revenue
$
203

 
$
222

Sales and marketing
1,745

 
763

Technology and development
1,298

 
1,079

General and administrative
2,661

 
3,828

Total stock-based compensation expense
5,907

 
5,892

Amount capitalized to internal software use
218

 
245

Total stock-based compensation cost
$
6,125

 
$
6,137