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Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Stock Options Activity
Activity with respect to the stock options is summarized as follows:
 
Number
 of
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-Average
Remaining
Contractual Term
(in years)
 
Aggregate
Intrinsic
Value
Outstanding at January 1, 2017
12,552,608

 
$
3.61

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Exercised
(2,417,769
)
 
$
4.80

 
 
 
 
Unvested options forfeited
(25,839
)
 
$
6.54

 
 
 
 
Vested options expired
(68,991
)
 
$
5.79

 
 
 
 

Outstanding at September 30, 2017
10,040,009

 
$
3.30

 
4.60
 
$
86,178,050

Vested at September 30, 2017
9,976,636

 
$
3.26

 
4.59
 
$
86,042,771

Vested or expected to vest at September 30, 2017 (a)
10,043,166

 
$
3.30

 
4.60
 
$
86,176,954

(a)
Includes forfeiture-adjusted unvested shares.
Stock Options Outstanding and Exercisable
Following is a summary of stock options outstanding and exercisable at September 30, 2017:
 
Options Outstanding
 
Options Exercisable
Range of Exercise Prices
Number outstanding
 
Weighted-Average
Remaining
Contractual Term
(in years)
 
Weighted-
Average
Exercise
Price
 
Number Exercisable
 
Weighted-
Average
Exercise Price
$0.70 - $1.09
1,094,429

 
2.8
 
$
0.91

 
1,094,429

 
$
0.91

$1.10 - $1.65
4,290,379

 
3.7
 
1.30

 
4,290,379

 
1.30

$2.45 - $3.75
854,001

 
5.0
 
2.77

 
854,001

 
2.77

$4.19 - $6.38
1,989,205

 
5.7
 
5.36

 
1,989,205

 
5.36

$6.49 - $9.78
1,713,328

 
6.4
 
7.30

 
1,683,625

 
7.26

$9.90 - $10.99
98,667

 
7.2
 
10.38

 
64,997

 
10.38

 
10,040,009

 
4.6
 
$
3.30

 
9,976,636

 
$
3.26
Restricted Stock Awards Roll Forward
Activity with respect to restricted stock awards for the nine months ended September 30, 2017 is summarized as follows and includes 17,539 shares of common stock valued at approximately $166,000 which were issued under the 2016 Plan to a consultant in return for services performed: 
 
Number
of
Shares
 
Weighted-Average Grant Date
Fair Value
Unvested at January 1, 2017
3,828,445

 
$8.53
Granted
3,041,078

 
9.23
Vested
(1,457,449
)
 
8.42
Forfeited
(283,198
)
 
8.67

Unvested at September 30, 2017
5,128,876

 
8.97
Allocation of Share-based Compensation
For the three and nine months ended September 30, 2017 and 2016, the Company recognized share-based compensation expense as follows (in thousands): 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Cost of sales
$
119

 
$
109

 
$
393

 
$
300

Research and development
148

 
159

 
425

 
520

Selling, general and administrative
5,039

 
4,433

 
14,414

 
13,006

 
$
5,306

 
$
4,701

 
$
15,232

 
$
13,826