Stock Options and Warrants, Options by Exercise Price Range (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Stock Options [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Number of Options (in shares)	10,040,735
Weighted-Average Remaining Contractual Life	8 years 5 months 16 days
Weighted-Average Exercise Price (in dollars per share)	$ 2.87
Number of Options Exercisable (in shares)	5,593,654
Weighted-Average Contractual Life	8 years 5 months 16 days
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 3.25
Warrants [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Number of Options (in shares)	7,349,760
Weighted-Average Remaining Contractual Life	1 year 8 months 16 days
Weighted-Average Exercise Price (in dollars per share)	$ 4.27
Number of Options Exercisable (in shares)	7,149,760
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 4.32
Range $ 1.83 - 2.50 [Member] \| Stock Options [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 1.83
Range of Exercise Prices, Upper Range (in dollars per share)	$ 2.50
Number of Options (in shares)	7,932,558
Weighted-Average Remaining Contractual Life	8 years 11 months 26 days
Weighted-Average Exercise Price (in dollars per share)	$ 2.19
Number of Options Exercisable (in shares)	3,801,902
Weighted-Average Contractual Life	8 years 11 months 26 days
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 2.17
Range $ 2.51 - 3.50 [Member] \| Stock Options [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 2.51
Range of Exercise Prices, Upper Range (in dollars per share)	$ 3.50
Number of Options (in shares)	774,482
Weighted-Average Remaining Contractual Life	8 years 10 months 20 days
Weighted-Average Exercise Price (in dollars per share)	$ 2.78
Number of Options Exercisable (in shares)	691,387
Weighted-Average Contractual Life	8 years 10 months 20 days
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 2.75
Range $ 3.51 - 8.00 [Member] \| Stock Options [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 3.51
Range of Exercise Prices, Upper Range (in dollars per share)	$ 8.00
Number of Options (in shares)	989,201
Weighted-Average Remaining Contractual Life	6 years 0 months 14 days
Weighted-Average Exercise Price (in dollars per share)	$ 6.27
Number of Options Exercisable (in shares)	755,871
Weighted-Average Contractual Life	6 years 0 months 14 days
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 6.57
Range $ 8.01 - 32.55 [Member] \| Stock Options [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 8.01
Range of Exercise Prices, Upper Range (in dollars per share)	$ 32.55
Number of Options (in shares)	344,494
Weighted-Average Remaining Contractual Life	2 years 4 months 17 days
Weighted-Average Exercise Price (in dollars per share)	$ 8.93
Number of Options Exercisable (in shares)	344,494
Weighted-Average Contractual Life	2 years 4 months 17 days
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 8.93
Range $2.10 - 2.60 [Member] \| Warrants [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 2.10
Range of Exercise Prices, Upper Range (in dollars per share)	$ 2.60
Number of Options (in shares)	645,716
Weighted-Average Remaining Contractual Life	3 years 0 months 18 days
Weighted-Average Exercise Price (in dollars per share)	$ 2.42
Number of Options Exercisable (in shares)	445,716
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 2.38
Range $2.61 - 3.60 [Member] \| Warrants [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 2.61
Range of Exercise Prices, Upper Range (in dollars per share)	$ 3.60
Number of Options (in shares)	125,000
Weighted-Average Remaining Contractual Life	0 years 10 months 10 days
Weighted-Average Exercise Price (in dollars per share)	$ 3.00
Number of Options Exercisable (in shares)	125,000
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 3.00
Range $3.61 - 4.60 [Member] \| Warrants [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 3.61
Range of Exercise Prices, Upper Range (in dollars per share)	$ 4.60
Number of Options (in shares)	6,496,899
Weighted-Average Remaining Contractual Life	1 year 6 months 25 days
Weighted-Average Exercise Price (in dollars per share)	$ 4.47
Number of Options Exercisable (in shares)	6,496,899
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 4.47
Range $4.61 - 5.60 [Member] \| Warrants [Member]
Share based compensation, shares authorized under significant ranges of outstanding stock option plans in period [Abstract]
Range of Exercise Prices, Lower Range (in dollars per share)	$ 4.61
Range of Exercise Prices, Upper Range (in dollars per share)	$ 5.60
Number of Options (in shares)	82,145
Weighted-Average Remaining Contractual Life	3 years 2 months 12 days
Weighted-Average Exercise Price (in dollars per share)	$ 5.41
Number of Options Exercisable (in shares)	82,145
Weighted-Average Exercise Price, Options Exercisable (in dollars per share)	$ 5.41

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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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- Definition

Weighted average remaining contractual term of exercisable 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

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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.

+ 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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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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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 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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- 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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