Stockholders' Equity (Details 2) - 2004 Equity Incentive Plans [Member] - $ / shares	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of year	5,864,626	6,480,934	6,630,934
Granted
Forfeited	(1,205,912)	(616,308)	(150,000)
Exercised
Outstanding, end of year	4,658,714	5,864,626	6,480,934
Exercisable, end of year	4,658,714	5,864,626	6,480,934
Available for future grants			170,019
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Option Price [Roll Forward]
Granted
Forfeited			$ 2.00
Exercised
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning of year	$ 2.69	$ 2.68	$ 2.66
Granted
Forfeited	$ 1.95	$ 2.58	$ 2.00
Exercised
Outstanding, end of year	$ 2.88	$ 2.69	$ 2.68
Exercisable, end of year	$ 2.88	$ 2.69	$ 2.68
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Weighted average remaining contractual life (years)	1 year	1 year	2 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Option Price [Roll Forward]
Outstanding, beginning of year	$ 1.30	$ 1.30	$ 1.30
Forfeited	1.63	1.90
Outstanding, end of year	1.30	1.30	1.30
Exercisable, end of year	$ 1.30	$ 1.30	$ 1.30
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Weighted average remaining contractual life (years)	3 years	4 years	5 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Option Price [Roll Forward]
Outstanding, beginning of year	$ 6.00	$ 6.00	$ 6.00
Forfeited	2.87	3.44
Outstanding, end of year	6.00	6.00	6.00
Exercisable, end of year	$ 6.00	$ 6.00	$ 6.00

Weighted average per share amount at which exercisable can acquire shares of common stock by exercise of options.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which exercisable can acquire shares of common stock by exercise of options.

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Price at which excercisedoption holders acquired shares when converting their stock options into shares.

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The share price under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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No definition available.

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Price at which granted option holders acquired shares when converting their stock options into shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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.

+ 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)(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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The combined weighted average of the accumulated differences between the fair values on underlying shares and exercises prices to acquire such shares as of the grant date on options that were either forfeited or lapsed.

+ 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 (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to 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)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Gross number of share options (or share units) granted during the period.

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

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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-Name Accounting Standards Codification
-Topic 505
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-Publisher FASB
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-Publisher SEC
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