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Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Fair Value Measurement Techniques
The assumptions used to estimate fair value and the resulting grant date fair values are as follows:
 
Employees
 
Non-employee Directors
 
Years Ended December 31,
 
Years Ended December 31,
 
2016
 
2015
 
2014
 
2016
 
2015
 
2014
Expected dividend yield
 
 
 
 
 
Weighted average expected volatility
67.18%
 
64.42%
 
68.57%
 
67.61%
 
63.46%
 
64.10%
Weighted average risk-free interest rate
1.48%
 
1.60%
 
2.05%
 
1.41%
 
1.62%
 
1.75%
Weighted average expected term (in years)
6.08
 
6.07
 
6.04
 
5.30
 
5.32
 
5.30
Forfeiture rate
5.00%
 
5.00%
 
5.00%
 
5.00%
 
5.00%
 
5.00%
Schedule of Share-based Compensation, Stock Options, Activity
The activity for the 2009 Plan, 2014 Plan and 2015 Plan for the years ended December 31, 2016 and 2015 is summarized as follows:
 
Number
of
Shares
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Life (in years)
 
Aggregate
Intrinsic
Value
Outstanding — January 1, 2015
615,322

 
$
9.55

 
9.48
 
$
265

Granted
880,116

 
8.17

 
 
 
 
Exercised

 

 
 
 
 
Canceled
(115,711
)
 
9.05

 
 
 
 
Outstanding — December 31, 2015
1,379,727

 
$
8.71

 
7.18
 
$

Exercisable — December 31, 2015
635,548

 
$
9.41

 
4.56
 
$

Vested or expected to vest — December 31, 2015
1,342,518

 
$
8.73

 
7.11
 
$

Outstanding — January 1, 2016
1,379,727

 
$
8.71

 
7.18
 
$

Granted
497,978

 
$
4.23

 
 
 
 
Exercised

 
$

 
 
 
 
Canceled
(58,261
)
 
$
7.47

 
 
 
 
Outstanding — December 31, 2016
1,819,444

 
$
7.52

 
6.98
 
$
32

Exercisable — December 31, 2016
1,022,515

 
$
8.59

 
5.51
 
$
15

Vested or expected to vest —December 31, 2016
1,779,597

 
$
7.55

 
6.94
 
$
31

Stock-Based Compensation Expense Related to Stock Options
Stock-based compensation expense related to stock options is included in the following line items in the accompanying statements of operations:
 
 
Years Ended December 31,
 
 
2016
 
2015
 
2014
Research and development, net
 
$
299

 
$
300

 
$
394

Selling, general and administrative
 
911

 
2,515

 
648

Discontinued operations
 

 
208

 
159

Total stock-based compensation expense
 
$
1,210

 
$
3,023

 
$
1,201