Stock Options: (Details 1) - $ / shares	3 Months Ended
Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock Options Outstanding, Number of Shares	8,602,534	8,582,952
Stock Options Outstanding, Weighted Avg. Contractual Life (years)	7 years 4 months 24 days
Weighted Avg. Exercise Price	$ 1.33	$ 1.32
Stock Options Exercisable, Number of Shares	6,004,722
Stock Options Exercisable, Weighted Avg. Exercise Price	$ 1.40
Exercise Price Range One [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	0.01
Range of Exercise Prices, Upper Range Limit	$ 0.71
Stock Options Outstanding, Number of Shares	828,082
Stock Options Outstanding, Weighted Avg. Contractual Life (years)	9 years 1 month 13 days
Weighted Avg. Exercise Price	$ 0.61
Stock Options Exercisable, Number of Shares	603,082
Stock Options Exercisable, Weighted Avg. Exercise Price	$ 0.60
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
Range of Exercise Prices, Upper Range Limit	$ 1.00
Stock Options Outstanding, Number of Shares	3,062,048
Stock Options Outstanding, Weighted Avg. Contractual Life (years)	8 years 2 months 5 days
Weighted Avg. Exercise Price	$ 0.93
Stock Options Exercisable, Number of Shares	1,410,709
Stock Options Exercisable, Weighted Avg. Exercise Price	$ 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
Range of Exercise Prices, Upper Range Limit	$ 1.55
Stock Options Outstanding, Number of Shares	1,120,000
Stock Options Outstanding, Weighted Avg. Contractual Life (years)	7 years 11 months 26 days
Weighted Avg. Exercise Price	$ 1.32
Stock Options Exercisable, Number of Shares	815,013
Stock Options Exercisable, Weighted Avg. Exercise Price	$ 1.24
Exercise Price Range Four [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	1.64
Range of Exercise Prices, Upper Range Limit	$ 2.22
Stock Options Outstanding, Number of Shares	3,592,404
Stock Options Outstanding, Weighted Avg. Contractual Life (years)	7 years 6 months 18 days
Weighted Avg. Exercise Price	$ 1.82
Stock Options Exercisable, Number of Shares	3,175,918
Stock Options Exercisable, Weighted Avg. Exercise Price	$ 1.78

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB
-Name Accounting Standards Codification
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-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 2
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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-SubTopic 10
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