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Stockholders' Equity (Deficit) (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted-average value of the individual options granted during 2012, 2013 and 2014 were determined using the following assumptions:
 
 
Year Ended December 31,
2012
2013
2014
Weighted-average volatility
89.13
%
101.00
%
102.86
%
Risk-free interest rate
1.10
%
1.31
%
1.98
%
Weighted-average expected life (in years)
6.2
6.6
6.6
Dividend yield
0.00
%
0.00
%
0.00
%
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
The Company’s stock option activity and related information are summarized as follows:
 
 
 
 
 
 
 
Options
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
(In Years)
 
Aggregate
Intrinsic Value
Outstanding at January 1, 2012
 
 
2,592,009
 
 
$
5.12
 
 
 
  
 
 
 
  
 
Granted during year
 
 
1,492,395
 
 
 
4.61
 
 
 
  
 
 
 
  
 
Exercised during year
 
 
(134,534
) 
 
 
2.91
 
 
 
  
 
 
 
  
 
Expired during year
 
 
(13,502
) 
 
 
9.86
 
 
 
  
 
 
 
  
 
Forfeited during year
 
 
(57,129
) 
 
 
6.68
 
 
 
  
 
 
 
  
 
Outstanding at December 31, 2012
 
 
3,879,239
 
 
$
4.96
 
 
 
7.50
 
 
$
16,198,044
 
Exercisable at December 31, 2012
 
 
1,676,016
 
 
 
3.83
 
 
 
5.72
 
 
 
8,882,339
 
Outstanding at January 1, 2013
 
 
3,879,239
 
 
 
4.96
 
 
 
  
 
 
 
  
 
Granted during year
 
 
1,566,062
 
 
 
10.79
 
 
 
  
 
 
 
  
 
Exercised during year
 
 
(188,699
) 
 
 
3.42
 
 
 
  
 
 
 
  
 
Expired during year
 
 
—
 
 
 
—
 
 
 
  
 
 
 
  
 
Forfeited during year
 
 
(10,137
) 
 
 
6.04
 
 
 
  
 
 
 
  
 
Outstanding at December 31, 2013
 
 
5,246,465
 
 
$
6.76
 
 
 
7.39
 
 
$
22,002,357
 
Exercisable at December 31, 2013
 
 
2,269,438
 
 
 
4.59
 
 
 
5.73
 
 
 
13,968,005
 
Outstanding at January 1, 2014
 
 
5,246,465
 
 
 
6.76
 
 
 
  
 
 
 
  
 
Granted during year
 
 
1,065,386
 
 
 
10.54
 
 
 
  
 
 
 
  
 
Exercised during year
 
 
(399,654
) 
 
 
3.23
 
 
 
  
 
 
 
  
 
Expired during year
 
 
(244,121
) 
 
 
9.17
 
 
 
  
 
 
 
  
 
Forfeited during year
 
 
(571,402
) 
 
 
10.49
 
 
 
  
 
 
 
  
 
Outstanding at December 31, 2014
 
 
5,096,674
 
 
$
7.29
 
 
 
6.87
 
 
$
6,329,518
 
Exercisable at December 31, 2014
 
 
2,695,278
 
 
 
5.89
 
 
 
5.68
 
 
 
4,986,059
 
Schedule of Nonvested Share Activity [Table Text Block]
The following is a rollforward of the Company’s nonvested stock options from January 1, 2012 to December 31, 2014.
 
 
Options
Weighted-Average
Grant Date Value
Nonvested stock options at January 1, 2012
1,252,668
$
5.34
Granted during year
1,492,395
3.42
Vested during year
(484,711
)
4.51
Expired during year
—
—
Forfeited during year
(57,129
)
4.61
Nonvested at December 31, 2012
2,203,223
$
4.24
Nonvested stock options at January 1, 2013
2,203,223
$
4.24
Granted during year
1,566,062
8.76
Vested during year
(782,121
)
4.22
Expired during year
—
—
Forfeited during year
(10,137
)
4.58
Nonvested at December 31, 2013
2,977,027
$
6.62
Nonvested stock options at January 1, 2014
2,977,027
$
6.62
Granted during year
1,065,386
8.62
Vested during year
(1,069,615
)
6.61
Expired during year
—
—
Forfeited during year
(571,402
)
8.36
Nonvested at December 31, 2014
2,401,396
$
7.07