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Stockholders' Equity And Stock-Based Compensation (Information About Stock Options Outstanding) (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of outstanding options, Options outstanding | shares	17,044,487
Weighted average remaining contractual life (in years), Options outstanding	4 years 9 months 18 days
Weighted average exercise price, Options outstanding	$ 3.60
Number of vested options, Options exercisable | shares	13,430,734
Weighted average exercise price, Options exercisable	$ 3.89
$1.72 - $1.87 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, Minimum	1.72
Range of exercise prices, Maximum	$ 1.87
Number of outstanding options, Options outstanding | shares	3,580,000
Weighted average remaining contractual life (in years), Options outstanding	8 years 4 months 24 days
Weighted average exercise price, Options outstanding	$ 1.81
Number of vested options, Options exercisable | shares	1,384,165
Weighted average exercise price, Options exercisable	$ 1.79
$2.03 - $2.58 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, Minimum	2.03
Range of exercise prices, Maximum	$ 2.58
Number of outstanding options, Options outstanding | shares	3,454,819
Weighted average remaining contractual life (in years), Options outstanding	5 years 1 month 6 days
Weighted average exercise price, Options outstanding	$ 2.45
Number of vested options, Options exercisable | shares	2,767,527
Weighted average exercise price, Options exercisable	$ 2.48
$2.69 - $4.39 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, Minimum	2.69
Range of exercise prices, Maximum	$ 4.39
Number of outstanding options, Options outstanding | shares	4,791,636
Weighted average remaining contractual life (in years), Options outstanding	3 years 2 months 12 days
Weighted average exercise price, Options outstanding	$ 3.69
Number of vested options, Options exercisable | shares	4,717,469
Weighted average exercise price, Options exercisable	$ 3.70
$4.59 - $5.00 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, Minimum	4.59
Range of exercise prices, Maximum	$ 5.00
Number of outstanding options, Options outstanding | shares	3,735,079
Weighted average remaining contractual life (in years), Options outstanding	3 years 6 months
Weighted average exercise price, Options outstanding	$ 4.87
Number of vested options, Options exercisable | shares	3,111,329
Weighted average exercise price, Options exercisable	$ 4.86
$5.20 - $7.65 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, Minimum	5.20
Range of exercise prices, Maximum	$ 7.65
Number of outstanding options, Options outstanding | shares	1,482,953
Weighted average remaining contractual life (in years), Options outstanding	3 years 6 months
Weighted average exercise price, Options outstanding	$ 7.12
Number of vested options, Options exercisable | shares	1,450,244
Weighted average exercise price, Options exercisable	$ 7.16

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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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- Definition

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.

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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

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- Definition

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.

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

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ 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 could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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- Definition

Weighted average remaining contractual term of outstanding stock options, 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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