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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Stock-Based Compensation [Abstract]  
Information about Stock Options Outstanding
The following tables summarize information about stock options and RSUs outstanding at December 31, 2018:

Options Outstanding
  
Options Vested and Exercisable
 

Range of
Exercise Prices
 
Number
Outstanding
  
Weighted
Average
Remaining
Contractual
Life (Years)
  
Weighted
Average
Exercise
Price
  
Number
Exercisable
  
Weighted
Average
Remaining
Contractual
Life (Years)
  
Weighted
Average
Exercise
Price
 
$   0.24-   1.58 
  
653,816
   
0.26
  
$
1.16
   
653,816
   
0.26
  
$
1.16
 
$   1.74-   6.95 
  
4,091,396
   
7.86
   
4.04
   
1,947,678
   
6.90
   
4.24
 
$ 14.52- 35.25 
  
1,253,625
   
3.71
   
23.16
   
1,253,625
   
3.71
   
23.16
 
   
5,998,837
   
6.16
  
$
7.72
   
3,855,119
   
4.74
  
$
9.87
 
Stock Option Activity
The following tables summarize activity under the Plan for the indicated periods:

 
 
Options
 
 
 
Number of
Shares
  
Weighted
Average
Exercise
Price
  
Weighted
Average
Remaining
Contractual
Life (Years)
  
Aggregate
Intrinsic
Value
 
Outstanding at December 31, 2015
  
4,999,928
  
$
8.76
   
—
  
$
—
 
Options granted
  
429,000
   
4.77
   
—
   
—
 
Options exercised
  
(50,357
)
  
0.40
   
—
   
—
 
Outstanding at December 31, 2016
  
5,378,571
  
$
8.52
   
—
  
$
—
 
Options granted
  
1,613,500
   
4.06
   
—
   
—
 
Options exercised
  
(12,500
)
  
1.74
   
—
   
—
 
Options cancelled
  
(1,841,505
)
  
4.71
   
—
   
—
 
Outstanding at December 31, 2017
  
5,138,066
  
$
8.41
   
—
  
$
—
 
Options granted
  
1,095,000
   
3.52
   
—
   
—
 
Options exercised
  
(117,229
)
  
1.15
   
—
   
—
 
Options cancelled
  
(117,000
)
  
5.34
   
—
   
—
 
Outstanding at December 31, 2018
  
5,998,837
  
$
7.72
   
6.16
  
$
810
 
Options exercisable at December 31, 2018
  
3,855,119
  
$
9.87
   
4.74
  
$
809
 
Restricted Stock Units Activity
The following tables summarize activity under the Plan for the indicated periods:
  
RSUs
 
  
Number of
RSUs
  
Weighted
Average
Grant Date
Fair Value
  
Aggregate
Intrinsic
Value
 
Outstanding at December 31, 2015
  
359,956
  
$
13.22
  
$
—
 
RSUs granted
  
219,331
   
4.75
   
—
 
RSUs vested
  
(155,852
)
  
15.27
   
—
 
Outstanding at December 31, 2016
  
423,435
  
$
8.08
  
$
—
 
RSUs granted
  
220,664
   
3.83
   
—
 
RSUs vested
  
(174,438
)
  
10.47
   
—
 
Outstanding at December 31, 2017
  
469,661
  
$
5.19
  
$
—
 
RSUs granted
  
246,663
   
3.26
   
—
 
RSUs vested
  
(211,330
)
  
6.19
   
—
 
Outstanding at December 31, 2018
  
504,994
  
$
3.83
  
$
—
 
Stock-Based Compensation by Type of Award
Stock-based compensation expense is included in general and administrative expense for each period as follows:

Stock-Based Compensation by Type of Award
 
Year Ended
December 31, 2018
  
Year Ended
December 31, 2017
  
Year Ended
December 31, 2016
 
Stock options
 
$
2,926
  
$
2,446
  
$
3,436
 
RSUs
  
1,129
   
1,540
   
1,962
 
Total stock-based compensation expense
 
$
4,055
  
$
3,986
  
$
5,398
 
Fair Value Assumptions
The fair value of each option grant was estimated on the date of grant using the Black-Scholes option pricing model using the following weighted average assumptions:

  
Year Ended
December 31, 2018
  
Year Ended
December 31, 2017
  
Year Ended
December 31, 2016
 
Expected stock price volatility
  
85.26
%
  
84.91
%
  
79.6
%
Risk-free interest rate
  
2.73
%
  
1.94
%
  
1.85
%
Expected life term
 
6.02 years
  
6.08 years
  
6.03 years
 
Expected dividends
  
0
%
  
0
%
  
0
%