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Stock-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Share-based Compensation Arrangement by Share-based Payment Award Options and Warrants Vested and Expected to Vest Outstanding and Exercisable [Table Text Block]
Exercise price
 
$
0.69
 
Expected dividends
 
 
0
%
Expected volatility
 
 
86
%
Risk free interest rate
 
 
2.75
%
Expected life of option
 
 
4 years
 
 
Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of stock option activity for the three months ended March 31, 2019 and the year ended December 31, 2018 is as follows:
 
 
 
Options
 
 
Weighted

Average Exercise

Price
 
 
Weighted Average

Remaining

Contractual Life (in Years)
 
 
Aggregate

Intrinsic

Value
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance - December 31, 2017
 
 
359,076
 
 
$
53.93
 
 
 
4.60
 
 
$
1,800
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Granted
 
 
671,500
 
 
$
0.69
 
 
 
 
 
 
 
 
 
Exercised
 
 
-
 
 
$
-
 
 
 
 
 
 
$
-
 
Expired
 
 
(78,667
)
 
$
67.02
 
 
 
 
 
 
 
 
 
Forfeited
 
 
(12,927
)
 
$
23.72
 
 
 
 
 
 
 
 
 
Balance - December 31, 2018
 
 
938,982
 
 
$
15.18
 
 
 
6.19
 
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Granted
 
 
-
 
 
$
-
 
 
 
 
 
 
 
 
 
Exercised
 
 
-
 
 
$
-
 
 
 
 
 
 
$
-
 
Expired
 
 
(16,954
)
 
$
91.53
 
 
 
 
 
 
 
 
 
Forfeited
 
 
(28,661
)
 
$
11.40
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance - March 31, 2019 - outstanding
 
 
893,367
 
 
$
13.85
 
 
 
5.90
 
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance -  March 31, 2019 - exercisable
 
 
265,619
 
 
$
42.91
 
 
 
4.16
 
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Grant date fair value of options granted - March 31, 2019
 
 
 
 
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average grant date fair value - March 31, 2019
 
 
 
 
 
$
-
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Grant date fair value of options granted - December 31, 2018
 
 
 
 
 
$
301,000
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Weighted average grant date fair value - December 31, 2018
 
 
 
 
 
$
0.45