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Stock-Based Compensation (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Workers Compensation Discount [Abstract]    
Summary of share-based compensation activity
Common stock option and restricted stock award activity under the Plan was as follows:
 
 
 
 
 
 
Options and RSAs
Outstanding
  
 
Shares
Available
for Grant
 
Number
of Shares
 
Weighted
Average Exercise
Price Per Share
Balance at December 31, 2015
 
 
71,431
 
 
 
369,887
 
 
$
4.64
 
Authorized
 
 
250,000
 
 
 
  
 
 
 
  
 
Options forfeited
 
 
153,098
 
 
 
(153,098
) 
 
$
3.10
 
Restricted awards granted
 
 
(54,054
) 
 
 
54,054
 
 
 
  
 
Restricted awards vested
 
 
  
 
 
 
(54,054
) 
 
 
  
 
Options expired
 
 
5,517
 
 
 
(7,017
) 
 
$
34.73
 
Balance at June 30, 2016
 
 
425,992
 
 
 
209,772
 
 
$
4.75
 
Total vested and expected to vest shares (options)
 
 
 
 
 
209,772
 
 
$
4.75
 
Total vested shares (options)
 
 
 
 
 
86,859
 
 
$
7.08
 
Common stock option and restricted stock award activity under the Plan was as follows:
 
 
 
 
 
 
Options and RSAs
Outstanding
  
 
Shares
Available
for Grant
 
Number of
Shares
 
Weighted
Average
Exercise
Price Per
Share
Balance at December 31, 2013
 
 
128,665
 
 
 
161,185
 
 
$
22.70
 
Authorized
 
 
70,695
 
 
 
—
 
 
$
—
 
Options granted
 
 
(110,920
) 
 
 
110,920
 
 
$
28.00
 
Options assumed in merger
 
 
—
 
 
 
1,500
 
 
$
143.00
 
Restricted Stock granted
 
 
(19,487
) 
 
 
19,487
 
 
$
14.50
 
Restricted Stock vested
 
 
—
 
 
 
(51,300
) 
 
$
19.60
 
Balance at December 31, 2014
 
 
68,953
 
 
 
241,792
 
 
$
25.90
 
Authorized
 
 
170,000
 
 
 
—
 
 
$
—
 
Options granted
 
 
(530,813
) 
 
 
530,813
 
 
$
5.65
 
Options forfeited
 
 
69,870
 
 
 
(69,870
) 
 
$
10.59
 
Options expired
 
 
12,148
 
 
 
(12,148
) 
 
$
24.72
 
Options canceled
 
 
320,700
 
 
 
(320,700
) 
 
$
12.99
 
Restricted Stock granted
 
 
(39,427
) 
 
 
39,427
 
 
$
3.86
 
Restricted Stock vested
 
 
—
 
 
 
(39,427
) 
 
$
3.86
 
Balance at December 31, 2015
 
 
71,431
 
 
 
369,887
 
 
$
4.64
 
Total vested and expected to vest shares (options)
 
 
 
 
 
369,887
 
 
$
4.64
 
Total vested shares (options)
 
 
 
 
 
51,555
 
 
$
14.12
 
Outstanding options
The following table summarizes information with respect to stock options outstanding at June 30, 2016:
 
 
 
 
 
 
 
 
Options Outstanding
 
Options Vested
  
 
Exercise
Price Per
Share
 
Shares
Outstanding
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Weighted-
Average
Exercise
Price
 
Shares
Exercisable
 
Weighted-
Average
Exercise Price
Per Share
  
 
$
3.10
 
 
 
182,528
 
 
 
9.30
 
 
$
3.10
 
 
 
59,615
 
 
$
3.10
 
  
 
$
5.60
 
 
 
2,500
 
 
 
0.83
 
 
$
5.60
 
 
 
2,500
 
 
$
5.60
 
  
 
$
11.40
 
 
 
17,674
 
 
 
0.83
 
 
$
11.40
 
 
 
17,674
 
 
$
11.40
 
  
 
$
30.40
 
 
 
7,070
 
 
 
0.83
 
 
$
30.40
 
 
 
7,070
 
 
$
30.40
 
  
 
 
 
 
 
209,772
 
 
 
8.20
 
 
$
4.75
 
 
 
86,859
 
 
$
7.08
 
The following table summarizes information with respect to stock options outstanding at December 31, 2015:
 
 
 
 
 
 
 
 
Options Outstanding
 
Options Vested
  
 
Exercise
Price Per
Share
 
Shares
Outstanding
 
Weighted-
Average
Remaining
Contractual
Life (Years)
 
Weighted-
Average
Exercise
Price
 
Shares
Exercisable
 
Weighted-
Average
Exercise
Price
Per Share
  
 
$
3.10
 
 
 
339,946
 
 
 
9.80
 
 
$
3.10
 
 
 
21,614
 
 
$
3.10
 

 
$
5.60
 
 
 
2,500
 
 
 
1.33
 
 
$
5.60
 
 
 
2,500
 
 
$
5.60
 

 
$
6.90
 
 
 
625
 
 
 
0.01
 
 
$
6.90
 
 
 
625
 
 
$
6.90
 

 
$
11.40
 
 
 
17,804
 
 
 
1.32
 
 
$
11.40
 
 
 
17,804
 
 
$
11.40
 

 
$
22.70
 
 
 
442
 
 
 
0.01
 
 
$
22.70
 
 
 
442
 
 
$
22.70
 

 
$
30.40
 
 
 
7,070
 
 
 
1.33
 
 
$
30.40
 
 
 
7,070
 
 
$
30.40
 

 
$
143.00
 
 
 
1,500
 
 
 
0.45
 
 
$
143.00
 
 
 
1,500
 
 
$
143.00
 

 
 
 
 
 
369,887
 
 
 
9.10
 
 
$
4.64
 
 
 
51,555
 
 
$
14.12
 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
The fair value of employee stock options granted was estimated using the following weighted-average assumptions for the six months ended June 30, 2016 and 2015:
 
 
 
 
2016
 
2015
Expected volatility
 
 
n/a
 
 
 
64.00
% 
Risk free rate
 
 
n/a
 
 
 
1.48
% 
Dividend yield
 
 
n/a
 
 
 
0.00
% 
Expected term (in years)
 
 
n/a
 
 
 
6.06
 
The fair value of employee stock options granted was estimated using the following weighted-average assumptions for the twelve months ended December 31:
 
 
 
 
2015
 
2014
Expected volatility
 
 
67
% 
 
 
75
% 
Risk free rate
 
 
1.41
% 
 
 
1.77
% 
Dividend yield
 
 
0
% 
 
 
0
% 
Expected term (in years)
 
 
5.57
 
 
 
5.78
 
Schedule Of Stock Based Compensation Of Employees And Non Employees
Stock-based compensation for employees and non-employees related to options and RSAs recognized:
 
 
 
 
 
 
For the three months ended
June 30
 
For the six months ended
June 30
  
 
2016
 
2015
 
2016
 
2015
General and administrative
 
$
263,098
 
 
$
124,627
 
 
$
393,456
 
 
$
596,901
 
Stock-based compensation for employees and non-employees related to options and RSAs recognized:
 
 
 
 
For the
twelve months
ended
December 31,
2015
 
For the
twelve months
ended
December 31,
2014
General and administrative
 
$
1,147,374
 
 
$
2,873,396