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Stock Options, Restricted Stock Units and Employee Stock Purchase Plan (Tables)
 9 Months Ended
Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The following table sets forth the components of the Company’s share-based compensation expense for the three and nine month periods ended September 30, 2017 and 2016 (in thousands):
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Stock options
$
3,190

 
$
3,410

 
$
9,461

 
$
8,349

Employee stock purchase plan
286

 
—

 
822

 
—

Restricted stock units
2,306

 
1,426

 
5,343

 
2,933

Total stock-based compensation expense
$
5,782

 
$
4,836

 
$
15,626

 
$
11,282
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The weighted-average assumptions used in estimating the grant date fair value of the stock options granted under the Company's equity compensation plans during the three and nine month periods ended September 30, 2017 and 2016, respectively, along with the weighted-average grant date fair values, are set forth in the table below:
 
Three Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
Expected volatility
—
%
 
49
%
 
50
%
 
48
%
Expected life (in years)
—

 
4.7

 
4.8

 
4.7

Risk-free interest rate
—
%
 
0.97
%
 
1.75
%
 
1.12
%
Dividend yield
—

 
—

 
—

 
—

Fair value per stock option
$
—

 
$
12.67

 
$
9.25

 
$
11.30

Forfeiture rate
—
%
 
8
%
 
8
%
 
8
%
Schedule of Share-based Compensation, Activity
The table below sets forth a summary of stock option activity within the 2014 Plan and the 2003 Plan for the nine month period ended September 30, 2017: 
 
Number of
Options
(in thousands)
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic Value
(in thousands) (1)
Outstanding at December 31, 2016
4,766

 
$
27.27

 
5.03
 
$
5,714

Granted
66

 
21.28

 
 
 
 
Exercised
(602
)
 
15.48

 
 
 
 
Forfeited
(135
)
 
27.94

 
 
 
 
Outstanding at September 30, 2017
4,095

 
$
28.89

 
4.81
 
$
24,917

Exercisable at September 30, 2017
1,696

 
$
29.25

 
4.09
 
$
10,476



(1) The Aggregate Intrinsic Value of stock options outstanding and exercisable is defined as the difference between the market value of the Company’s common stock as of the date indicated and the exercise price of the stock options. Stock options for which the exercise price exceeded the market price have been omitted. Fluctuations in the intrinsic value of both outstanding and exercisable options may result from changes in underlying stock price and the timing and volume of option grants, exercises and forfeitures.
Schedule of Nonvested Restricted Stock Units Activity
Set forth below is a summary of non-vested RSU activity during the nine month period ended September 30, 2017:
 
Number of Units
(in thousands)
 
Weighted Average Per Share
Grant Date Fair Value
Non-vested at December 31, 2016
416
 
$
31.52

Granted
666
 
$
33.10

Vested
(138)
 
$
32.55

Forfeited
(42)
 
$
31.04

Non-vested at September 30, 2017
902
 
$
32.55