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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity
A summary of our stock option activity for the nine months ended September 30, 2017, is as follows (number of shares in thousands):
 
 
Number of
Shares
 
Weighted
Average
Exercise
Price per Share
 
Weighted
Average
Remaining
Contractual Life
in Years
Options outstanding as of December 31, 2016
 
1,718

 
$
8.75

 
8.2
Options granted
 
172

 
24.77

 
 
Options exercised
 
(133
)
 
3.83

 
 
Options cancelled/forfeited
 
(29
)
 
9.84

 
 
Options outstanding as of September 30, 2017
 
1,728

 
$
10.70

 
7.9
Schedule of Valuation Assumptions, Stock Options
The following table summarizes information relating to our stock options granted during the three and nine months ended September 30, 2017 and 2016: 
 
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
 
2017
 
2016
 
2017
 
2016
Stock options granted (in thousands)
 
—

 
—

 
172

 
750

Weighted average exercise price per share
 
$
—

 
$
—

 
$
24.77

 
$
12.85

Weighted average grant-date fair value per share
 
$
—

 
$
—

 
$
9.58

 
$
4.85

Weighted average Black-Scholes model assumptions:
 
 
 
 
 
 
 
 
Risk-free interest rate
 
—
%
 
—
%
 
2.02
%
 
1.45
%
Expected term (in years)
 
—

 
—

 
6.4

 
5.9

Expected volatility
 
—
%
 
—
%
 
35
%
 
37
%
Expected dividend yield
 
—

 
—

 
—

 
—
Schedule of Restricted Stock Units Activity
A summary of activity in connection with our RSUs for the nine months ended September 30, 2017, is as follows (number of shares in thousands):
 
 
Number of Shares
 
Weighted- Average Grant Date Fair Value per Share
Unvested as of December 31, 2016
 
496

 
$
13.34

Granted
 
307

 
25.64

Vested
 
(139
)
 
12.81

Forfeited
 
(46
)
 
16.17

Unvested as of September 30, 2017
 
618

 
$
19.36
Schedule of Restricted Stock Awards Activity
A summary of activity in connection with our restricted stock awards for the nine months ended September 30, 2017, follows (number of shares in thousands): 
 
 
Number of
Shares
 
Weighted-Average
Grant Date
Fair Value per Share
Unvested as of December 31, 2016
 
46

 
$
8.55

Granted
 
9

 
33.30

Vested
 
(38
)
 
9.33

Forfeited
 
—

 
—

Unvested as of September 30, 2017
 
17

 
$
19.79