Warrants (Tables)
|
3 Months Ended |
12 Months Ended |
Mar. 31, 2019 |
Dec. 31, 2018 |
| Class of Warrant or Right [Line Items] |
|
|
| Schedule of assumptions used to estimate fair value stock warrants granted |
| |
|
March 31, 2019 |
|
| |
|
|
|
| Expected dividend yield |
|
|
0 |
% |
| Expected volatility |
|
|
90 |
% |
| Risk-free interest rate |
|
|
2.40 |
% |
| Expected life of options |
|
|
4.00 years |
|
|
|
| Schedule of warrant activity |
| |
|
Number of Warrants |
|
|
Weighted
Average
Exercise Price |
|
|
Weighted Average Remaining Contractual Life in Years |
|
|
Aggregate Intrinsic
Value |
|
| Outstanding – December 31, 2018 |
|
|
2,280,000 |
|
|
$ |
0.72 |
|
|
|
3.44 |
|
|
|
|
|
| Exercisable – December 31, 2018 |
|
|
2,280,000 |
|
|
$ |
0.72 |
|
|
|
3.44 |
|
|
$ |
0.00 |
|
| Granted |
|
|
50,000 |
|
|
$ |
1.06 |
|
|
|
|
|
|
|
|
|
| Forfeited or Expired |
|
|
0 |
|
|
$ |
0 |
|
|
|
|
|
|
|
|
|
| Outstanding – March 31, 2018 |
|
|
2,330,000 |
|
|
$ |
0.73 |
|
|
|
3.21 |
|
|
$ |
0 |
|
| Exercisable – March 31, 2018 |
|
|
2,280,000 |
|
|
$ |
0.72 |
|
|
|
3.19 |
|
|
$ |
1,132,500 |
|
| |
|
Number of Warrants |
|
|
Weighted
Average
Exercise Price per Share |
|
|
Weighted Average Contractual Life in Years |
|
|
Aggregate Intrinsic
Value |
|
| Outstanding – December 31, 2017 |
|
|
2,232,500 |
|
|
$ |
1.36 |
|
|
|
4.34 |
|
|
|
|
|
| Exercisable – December 31, 2017 |
|
|
2,232,500 |
|
|
$ |
1.36 |
|
|
|
4.34 |
|
|
$ |
0 |
|
| Granted |
|
|
0 |
|
|
$ |
0 |
|
|
|
|
|
|
|
|
|
| Forfeited or Expired |
|
|
0 |
|
|
$ |
0 |
|
|
|
|
|
|
|
|
|
| Outstanding – March 31, 2018 |
|
|
2,232,500 |
|
|
$ |
1.36 |
|
|
|
4.09 |
|
|
$ |
0 |
|
| Exercisable – March 31, 2018 |
|
|
2,232,500 |
|
|
$ |
1.36 |
|
|
|
4.09 |
|
|
$ |
0 |
|
|
|
| Warrant [Member] |
|
|
| Class of Warrant or Right [Line Items] |
|
|
| Schedule of assumptions used to estimate fair value stock warrants granted |
|
| |
2018 | |
| | |
| |
| Expected dividend yield | |
| 0 | % |
| Expected volatility | |
| 91 | % |
| Risk-free interest rate | |
| 2.93 | % |
| Expected life of options | |
| 4.00 years | |
| | |
2017 | |
| | |
| |
| Expected dividend yield | |
| 0 | % |
| Expected volatility | |
| 80 | % |
| Risk-free interest rate | |
| 2.62 | % |
| Expected life of warrants | |
| 4-5 years | |
|
| Schedule of warrant activity |
|
| |
|
Number of Warrants |
|
|
Weighted
Average
Exercise Price |
|
|
Weighted Average Remaining Contractual Life in Years |
|
|
Aggregate Intrinsic
Value |
|
| Outstanding – December 31, 2016 |
|
|
183,737 |
|
|
$ |
7.35 |
|
|
|
2.70 |
|
|
|
|
|
| Exercisable – December 31, 2016 |
|
|
171,237 |
|
|
$ |
7.15 |
|
|
|
2.79 |
|
|
$ |
0.00 |
|
| Granted |
|
|
2,050,000 |
|
|
$ |
1.00 |
|
|
|
|
|
|
|
|
|
| Forfeited or Expired |
|
|
(1,237 |
) |
|
$ |
303,37 |
|
|
|
|
|
|
|
|
|
| Outstanding – December 31, 2017 |
|
|
2,232,500 |
|
|
$ |
1.36 |
|
|
|
4.34 |
|
|
|
|
|
| Exercisable – December 31, 2017 |
|
|
2,232,500 |
|
|
$ |
1.36 |
|
|
|
4.34 |
|
|
$ |
0.00 |
|
| Granted |
|
|
100,000 |
|
|
$ |
1.00 |
|
|
|
|
|
|
|
|
|
| Forfeited or Expired |
|
|
(52,500 |
) |
|
$ |
8.57 |
|
|
|
|
|
|
|
|
|
| Outstanding – December 31, 2018 |
|
|
2,280,000 |
|
|
$ |
0.72 |
|
|
|
3.44 |
|
|
|
|
|
| Exercisable – December 31, 2018 |
|
|
2,280,000 |
|
|
$ |
0.72 |
|
|
|
3.44 |
|
|
$ |
0.00 |
|
|