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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- Definition

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.

+ References

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- Definition

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

+ References

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

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

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- Definition

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

+ References

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)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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.

+ References

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

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Stockholders' Equity (Details 1) - $ / shares	12 Months Ended
Stockholders' Equity (Details 1) - $ / shares	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Number of Shares	134,150	150,138	231,941
Weighted Average Exercise Price	$ 85.22	$ 67.99	$ 81.15
Exercisable Number of Shares	109,066
Exercisable Weighted Avg. Exercise Price	$ 84.40
Exercise Price $0 - $37.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Number of Shares	2,168
Weighted Average Remaining Contractual Life (years)	2 years 6 months 14 days
Weighted Average Exercise Price	$ 30.78
Exercisable Number of Shares	2,168
Exercisable Weighted Avg. Exercise Price	$ 30.78
Exercise Price $37.51 - $75.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Number of Shares	57,145
Weighted Average Remaining Contractual Life (years)	5 years 6 months 22 days
Weighted Average Exercise Price	$ 71.32
Exercisable Number of Shares	47,746
Exercisable Weighted Avg. Exercise Price	$ 71.12
Exercise Price $75.01 - $122.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Number of Shares	74,640
Weighted Average Remaining Contractual Life (years)	5 years 4 months 17 days
Weighted Average Exercise Price	$ 97.05
Exercisable Number of Shares	58,841
Exercisable Weighted Avg. Exercise Price	$ 96.25
Exercise Price $122.51 - up [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding Number of Shares	197
Weighted Average Remaining Contractual Life (years)	4 days
Weighted Average Exercise Price	$ 234.06
Exercisable Number of Shares	311
Exercisable Weighted Avg. Exercise Price	$ 256.15