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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

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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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

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-Section F

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

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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.

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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

-Subparagraph (c)(1)(iii)

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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.

+ References

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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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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.

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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

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

+ References

No definition available.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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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

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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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-Publisher FASB

-Name Accounting Standards Codification

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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

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-Name Accounting Standards Codification

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

+ References

No definition available.

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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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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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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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Accounting for Shared-Based Payments (Details 2) (USD $)	3 Months Ended		12 Months Ended	75 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Mar. 31, 2015
Weighted Average Remaining Contractual Term
Stock based compensation expense	$ 2,405,000	$ 1,264,000
Stock options \| Exercise price per share 0.44 - 17.79
Number of Options
Balance outstanding, beginning of period (in shares)	16,567,020
Balance outstanding, end of period (in shares)	16,621,065		16,567,020	16,621,065
Exercisable at the end of the period (in shares)	7,232,742			7,232,742
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)	$ 0.44		$ 0.44
Exercise price, high end of the range (in dollars per share)	$ 17.79		$ 17.79
Weighted Average Exercise Price Per Share
Balance outstanding, end of period (in dollars per share)	$ 3.16		$ 3.20	$ 3.16
Exercisable at the end of the period (in dollars per share)	$ 3.12			$ 3.12
Intrinsic Value
Intrinsic value of options outstanding (in dollars)	26,233,000		8,949,000	26,233,000
Intrinsic value of options exercisable (in dollars)	11,808,000			11,808,000
Weighted Average Remaining Contractual Term
Balance at the end of the period	7 years 1 month 2 days		7 years 3 months 15 days
Exercisable at the end of the period	5 years 9 months 22 days
Stock options \| Exercise price per share 0.44 - 17.79 \| Contingent vesting
Number of Options
Balance outstanding, end of period (in shares)	4,364,000			4,364,000
Weighted Average Exercise Price Per Share
Balance outstanding, end of period (in dollars per share)	$ 0.70			$ 0.70
Weighted Average Remaining Contractual Term
Stock based compensation expense				$ 0
Stock options \| Exercise price per share 2.94 - 3.33
Number of Options
Granted (in shares)	135,000
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)	$ 2.94
Exercise price, high end of the range (in dollars per share)	$ 3.33
Weighted Average Exercise Price Per Share
Granted (in dollars per share)	$ 3.04
Stock options \| Exercise price per share 8.34 - 9.45
Number of Options
Forfeited (in shares)	(80,955)
Exercise Price Per Share
Exercise price, low end of the range (in dollars per share)	$ 8.34
Exercise price, high end of the range (in dollars per share)	$ 9.45
Weighted Average Exercise Price Per Share
Forfeited (in dollars per share)	$ 9.26