Stock Options: (Details 1) - $ / shares
|
6 Months Ended |
12 Months Ended |
|
|
Jun. 30, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
|
|
|
| Stock Options Outstanding, Number of Shares |
8,832,534
|
8,582,952
|
7,769,202
|
6,249,952
|
| Stock Options Outstanding, Weighted Avg. Contractual Life (years) |
7 years 3 months 18 days
|
7 years 6 months
|
|
|
| Weighted Avg. Exercise Price |
$ 1.3
|
$ 1.32
|
$ 1.40
|
$ 1.48
|
| Stock Options Exercisable, Number of Shares |
6,181,229
|
5,776,716
|
|
|
| Stock Options Exercisable, Weighted Avg. Exercise Price |
$ 1.39
|
$ 1.41
|
|
|
| Exercise Price Range One [Member] |
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|
|
|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
|
|
|
| Range of Exercise Prices, Lower Range Limit |
0.01
|
0.01
|
|
|
| Range of Exercise Prices, Upper Range Limit |
$ 0.71
|
$ 0.71
|
|
|
| Stock Options Outstanding, Number of Shares |
1,078,082
|
750,000
|
|
|
| Stock Options Outstanding, Weighted Avg. Contractual Life (years) |
9 years 1 month 10 days
|
8 years 10 months 10 days
|
|
|
| Weighted Avg. Exercise Price |
$ 0.61
|
$ 0.61
|
|
|
| Stock Options Exercisable, Number of Shares |
665,582
|
528,082
|
|
|
| Stock Options Exercisable, Weighted Avg. Exercise Price |
$ 0.61
|
$ 0.61
|
|
|
| Exercise Price Range Two [Member] |
|
|
|
|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
|
|
|
| Range of Exercise Prices, Lower Range Limit |
0.80
|
0.80
|
|
|
| Range of Exercise Prices, Upper Range Limit |
$ 1.00
|
$ 1.00
|
|
|
| Stock Options Outstanding, Number of Shares |
3,062,048
|
3,120,548
|
|
|
| Stock Options Outstanding, Weighted Avg. Contractual Life (years) |
7 years 11 months 5 days
|
8 years 5 months 8 days
|
|
|
| Weighted Avg. Exercise Price |
$ 0.93
|
$ 0.93
|
|
|
| Stock Options Exercisable, Number of Shares |
1,478,024
|
1,343,394
|
|
|
| Stock Options Exercisable, Weighted Avg. Exercise Price |
$ 0.96
|
$ 0.96
|
|
|
| Exercise Price Range Three [Member] |
|
|
|
|
| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
|
|
|
| Range of Exercise Prices, Lower Range Limit |
1.11
|
1.11
|
|
|
| Range of Exercise Prices, Upper Range Limit |
$ 1.55
|
$ 1.55
|
|
|
| Stock Options Outstanding, Number of Shares |
1,120,000
|
1,120,000
|
|
|
| Stock Options Outstanding, Weighted Avg. Contractual Life (years) |
7 years 8 months 26 days
|
8 years 2 months 26 days
|
|
|
| Weighted Avg. Exercise Price |
$ 1.32
|
$ 1.32
|
|
|
| Stock Options Exercisable, Number of Shares |
842,438
|
783,589
|
|
|
| Stock Options Exercisable, Weighted Avg. Exercise Price |
$ 1.25
|
$ 1.23
|
|
|
| Exercise Price Range Four [Member] |
|
|
|
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| Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items] |
|
|
|
|
| Range of Exercise Prices, Lower Range Limit |
1.64
|
1.64
|
|
|
| Range of Exercise Prices, Upper Range Limit |
$ 2.22
|
$ 2.22
|
|
|
| Stock Options Outstanding, Number of Shares |
3,572,404
|
3,592,404
|
|
|
| Stock Options Outstanding, Weighted Avg. Contractual Life (years) |
7 years 3 months 18 days
|
7 years 9 months 18 days
|
|
|
| Weighted Avg. Exercise Price |
$ 1.82
|
$ 1.82
|
|
|
| Stock Options Exercisable, Number of Shares |
3,195,185
|
3,121,651
|
|
|
| Stock Options Exercisable, Weighted Avg. Exercise Price |
$ 1.79
|
$ 1.78
|
|
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