Classes of warrants or right term exercise period.

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- Definition

Common stock purchasable under securities purchase agreement.

+ References

No definition available.

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- Definition

Net Proceeds From Offering

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- Definition

Placement Agent Fees And Offering Costs

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No definition available.

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

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-Publisher SEC

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- Definition

Describe the conversion features of common stock if such stock is convertible. That is, shares of common stock into which another convertible security was converted, or shares of common stock into which another class of common stock was converted.

+ References

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-Publisher FASB

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Face amount or stated value per share of common stock.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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- Definition

The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

+ References

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- Definition

The cash inflow from the additional capital contribution to the entity.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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-Subparagraph (a)

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- Definition

Amount per share or per unit of equity securities issued by non-development stage entity.

+ References

No definition available.

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Stock Split

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- Definition

Number of shares issued during the period as a result of the conversion of convertible securities.

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-Name Regulation S-X (SX)

-Number 210

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-Article 3

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Number of new stock issued during the period.

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Common Stock - Additional Information (Detail) (USD $)	0 Months Ended	12 Months Ended	0 Months Ended
Common Stock - Additional Information (Detail) (USD $)	Dec. 02, 2014	Dec. 31, 2014	Feb. 11, 2014	Jan. 21, 2014	Dec. 31, 2013
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Proceeds from issuance of common stock		$ 70,237,000
Shares of common stock into which warrants are exercisable	871,840
Common stock, shares authorized		200,000,000us-gaap_CommonStockSharesAuthorized			77,688,009us-gaap_CommonStockSharesAuthorized
Preferred stock, shares authorized		5,000,000us-gaap_PreferredStockSharesAuthorized			0us-gaap_PreferredStockSharesAuthorized
Sale of common stock under securities purchase agreement	1,743,680
Common stock, par value		$ 0.001			$ 0.001
Warrant issued, exercise price	$ 11.47
Common stock conversion ratio	One half of one share of common stock
Common warrants exercise period	3 years
Net proceeds from offering	18,200,000ebio_NetProceedsFromOffering
Placement agent's fees and other offering expenses		1,300,000ebio_PlacementAgentFeesAndOfferingCosts
Common Stock [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Issuance of common stock		1,743,680
Common Stock Warrants [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Common stock, par value	$ 0.001
Warrant issued, exercise price	$ 15.00
Initial Public Offering ("IPO") [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Issuance of common stock	1,743,680		5,750,000
Share offering price			$ 10.00
Proceeds from issuance of common stock	$ 18,200,000		$ 50,200,000
Shares of common stock into which warrants are exercisable	871,840
Common stock, shares authorized			200,000,000
Preferred stock, shares authorized			5,000,000
Initial Public Offering ("IPO") [Member] \| Common Stock [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Issuance of common stock		14,010,424
Stock issued related to conversion of preferred stock			8,260,444
Shares of common stock into which warrants are exercisable			30,708
Initial Public Offering ("IPO") [Member] \| Underwriter [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Issuance of common stock			750,000
Reverse Stock Split [Member]
Common Stock Capital Shares Reserved For Future Issuance [Line Items]
Reverse stock split ratio				0.1575