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Equity (Tables)
 6 Months Ended
Jun. 30, 2013
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, 2013
13,614,135

 
$
1.42

 
 
 
 
Granted
3,024,500

 
5.09

 
 
 
 
Exercised
(489,197
)
 
1.11

 
 
 
 
Unvested options forfeited
(179,167
)
 
3.82

 
 
 
 
Vested options expired
(52,999
)
 
1.11

 
 
 
 
Outstanding at June 30, 2013
15,917,272

 
2.10

 
7.9
 
$
78,906,155

Vested at June 30, 2013
7,044,063

 
1.12

 
6.5
 
$
41,809,325

Vested or expected to vest at June 30, 2013 (a)
15,576,624

 
$
2.10

 
7.9
 
$
77,742,045

(a)
Includes forfeiture adjusted unvested shares.
Stock Options Outstanding and Exercisable
Following is a summary of stock options outstanding and exercisable at June 30, 2013:
 
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
$0.50 - $0.76
2,169,500

 
4.8
 
$
0.67

 
2,169,500

 
$
0.67

$0.87 - $1.35
6,814,572

 
8.1
 
1.19

 
3,356,198

 
1.18

$1.40 - $2.29
1,816,700

 
6.4
 
1.63

 
1,518,365

 
1.65

$2.33 - $3.75
2,164,500

 
9.2
 
2.75

 
—

 
—

$3.95 - $6.53
2,804,000

 
9.7
 
5.00

 
—

 
—

$6.60 - $6.75
148,000

 
9.9
 
6.61

 
—

 
—

 
15,917,272

 
7.9
 
$
2.10

 
7,044,063

 
$
1.12
Fair Value of Options, Valuation Assumptions
The assumptions used in calculating the fair value of options using the Black-Scholes-Merton option-pricing model are set forth in the following table:
 
Six months ended June 30,
 
2013
 
2012
Expected volatility
62.15-64.27%

 
57.3 - 57.6%

Expected life (in years)
5.5 - 6

 
6

Expected dividend yield
—

 
—

Risk-free interest rate
0.85-1.13%

 
1.48-2.24%
Allocation of Share-based Compensation
For the three and six months ended June 30, 2013 and 2012, the Company recognized stock-based compensation as follows: 
 
Three Months Ended
 June 30,
 
Six Months Ended
 June 30,
 
2013
 
2012
 
2013
 
2012
Cost of products sold
$
72,669

 
$
29,479

 
$
122,831

 
$
53,489

Research and development
122,789

 
75,610

 
198,767

 
147,130

Selling, general and administrative
1,306,989

 
480,126

 
2,165,641

 
885,581

 
$
1,502,447

 
$
585,215

 
$
2,487,239

 
$
1,086,200
Summary of Warrants Outstanding
Following is a summary of the warrant activity for the six months ended June 30, 2013:
 
Number of
Warrants
 
Weighted-
Average
Exercise
Price per
Warrant
Warrants outstanding at January 1, 2013
3,129,168

 
$
1.04

Warrants exercised:
 
 
 
  Contingent warrants related to private placement of common stock
(62,500
)
 
0.01

  Callable warrants
(266,666
)
 
1.50

  Other
(668,000
)
 
1.15

Warrants outstanding at June 30, 2013
2,132,002

 
$
0.98