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Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock options activity
A summary of stock option activity as of December 31, 2018, and changes during the year then ended are presented below:
 
Number of
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2018
9,953,575

 
$
3.28

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(786,708
)
 
4.52

 
 
 
 
Unvested options forfeited
—

 
—

 
 
 
 
Vested options expired
(5,469,720
)
 
2.22

 
 
 
 
Outstanding at December 31, 2018
3,697,147

 
4.59

 
3.57
 
$
595,684

Exercisable at December 31, 2018
3,697,147

 
$
4.59

 
3.57
 
$
595,684
Restricted stock awards roll forward
Following is summary information for restricted stock awards for the year ended December 31, 2018. Shares vest over a one to three year period in equal annual increments and require continuous service. For the time-based awards with service vesting conditions, the Company recognizes stock-based compensation expense using the straight-line expense attribution method.
As of December 31, 2018, there was approximately $17.0 million of total unrecognized stock-based compensation related to non-vested restricted stock.  That expense is expected to be recognized over a weighted-average period of 1.7 years, which approximates the remaining vesting period of these grants. All shares noted below as unvested are considered issued and outstanding at December 31, 2018.
 
 
Number of
Shares
 
Weighted-Average Grant Date
Fair Value
Unvested at January 1, 2018
 
5,181,405

 
$
9.18

Granted
 
1,947,475

 
8.52

Vested
 
(2,268,431
)
 
9.26

Forfeited
 
(1,861,314
)
 
8.96

Unvested at December 31, 2018
 
2,999,135

 
$
8.83
Allocation of share-based compensation
For the years ended December 31, 2018, 2017, and 2016 the Company recognized share-based compensation as follows (in thousands):
 
 
Years Ended December 31,
 
2018
 
2017
 
2016
 
 
 
 
 
(Restated)
Cost of sales
$
705

 
$
539

 
$
439

Research and development
584

 
604

 
621

Selling, general and administrative
13,479

 
20,052

 
16,672

Total share-based compensation
$
14,768

 
$
21,195

 
$
17,732

Income tax benefit
(3,803
)

(5,345
)

(6,756
)
Total share-based compensation, net of tax benefit
$
10,965

 
$
15,850

 
$
10,976