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Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock-based compensation
The following table summarizes stock-based compensation expense related to all of the Company’s stock awards included in operating expense categories as follows:
 
December 31,
 
2017
 
2016
 
2015
 
 
 
(Restated)
 
(Restated)
Cost of revenues
$
4,602

 
$
7,310

 
$
6,922

Research and development
6,030

 
8,891

 
7,461

Selling, general and administrative
11,863

 
17,977

 
17,021

Total stock-based compensation
$
22,495

 
$
34,178

 
$
31,404


The following table summarizes stock-based compensation expense:
 
December 31,
 
2017
 
2016
 
2015
 
 
 
(Restated)
 
(Restated)
Stock options
$
6,311

 
$
7,778

 
$
8,495

Restricted stock awards
15,802

 
25,583

 
22,285

ESPP Plan
382

 
817

 
624

Total stock-based compensation before taxes
$
22,495

 
$
34,178

 
$
31,404

Tax benefit
$
3,921

 
$
11,108

 
$
10,130
Schedule of fair value assumptions
The weighted-average assumptions used in the Black-Scholes option pricing model are as follows:
 
December 31,
 
2017
 
2016
 
2015
Expected stock price volatility
57.0
%
 
45.0
%
 
47.0
%
Risk-free interest rate
1.8
%
 
1.2
%
 
1.3
%
Expected life of options (in years)
4.08

 
4.00

 
4.00

Expected dividend yield
—
%
 
—
%
 
—
%
Weighted-average fair value (grant date) of the options
$
6.30

 
$
11.13

 
$
15.88
Schedule of information about stock options outstanding
The following table summarizes information about stock options outstanding:
Options
 
Number of
Options
 
Weighted-
Average
Exercise Price
 
Weighted-
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
Outstanding at December 31, 2016 (restated)
 
2,306

 
$
32.43

 
 
 
 
Options Granted
 
2,891

 
$
15.09

 
 
 
 
Options Exercised
 
(104
)
 
$
11.34

 
 
 
 
Options Cancelled
 
(1,143
)
 
$
12.93

 
 
 
 
Outstanding at December 31, 2017
 
3,950

 
$
21.54

 
5.34
 
$
—

Vested and exercisable at December 31, 2017
 
1,185

 
$
32.35

 
3.26
 
$
—
Schedule of total intrinsic value for options exercised and fair value of vested options
The below table summarizes additional information related to stock options:
 
December 31,
 
2017
 
2016
 
2015
Total intrinsic value for stock options exercised
$
1,007

 
$
8,953

 
$
18,369
Summary of unvested restricted stock activity
A summary of the Company’s unvested restricted stock at December 31, 2017, and changes during the year ended December 31, 2017, is presented below:
Non-Vested Restricted Stock
 
Number of
Awards
 
Weighted- Average
Grant Date
Fair Value
Non-vested at December 31, 2016 (restated)
 
1,645

 
$
36.27

Granted
 
3,426

 
22.75

Vested
 
(946
)
 
32.16

Forfeited
 
(2,061
)
 
22.21

Non-vested at December 31, 2017
 
2,064

 
$
22.75