Number of equity-based compensation plans.

No definition available.

Name:	edge_NumberOfEquityBasedCompensationPlans
Namespace Prefix:	edge_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Refers to the percentage of stock outstanding as of the immediately preceding December 31st used to determine the annual increase in the Plan limit for authorized shares that may be granted as qualified and nonqualified options.

+ References

No definition available.

+ Details

Name:	edge_PercentageOfCommonStockOutstanding
Namespace Prefix:	edge_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Refers to the number of equal monthly installments awarded options will vest.

+ References

No definition available.

+ Details

Name:	edge_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfMonthlyInstallmentsForVesting
Namespace Prefix:	edge_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Term the Plan shall continue to remain effective, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	edge_ShareBasedCompensationArrangementByShareBasedPaymentAwardTermOfPlan
Namespace Prefix:	edge_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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 S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_AllocatedShareBasedCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_EmployeeServiceShareBasedCompensationAggregateDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsAndMethodologyAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of vesting of share-based compensation awards.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Expected term of share-based compensation awards, 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 (f)(2)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.D.2)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_TitleOfIndividualAxis=edge_SeniorVicePresidentGeneralCounselAndSecretaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=edge_NonqualifiedStockOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TitleOfIndividualAxis=edge_VicePresidentClinicalDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=edge_EquityCompensationPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=edge_QualifiedAndNonqualifiedStockOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_AwardTypeAxis=edge_IncentiveStockOptionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=edge_EquityIncentivePlan2010Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=edge_EquityIncentivePlan2012Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=edge_EquityIncentivePlan2014Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Stock Options, Equity Compensation Plans (Details)			3 Months Ended		9 Months Ended		12 Months Ended
Stock Options, Equity Compensation Plans (Details)	Jul. 01, 2016 shares	Nov. 16, 2015 shares	Sep. 30, 2016 USD ($) Plan $ / shares	Sep. 30, 2015 USD ($) $ / shares	Sep. 30, 2016 USD ($) Plan Installment $ / shares shares	Sep. 30, 2015 USD ($) $ / shares	Dec. 31, 2014 shares	Jan. 02, 2016 shares	Jan. 02, 2015 shares	Dec. 31, 2013 shares	Dec. 31, 2012 shares	Dec. 31, 2010 shares
Stock Options [Abstract]
Number of equity compensation plans \| Plan			3		3
Stock-Based Compensation [Abstract]
Stock-based compensation expense \| $			$ 1,233,031	$ 611,878	$ 4,029,326	$ 1,566,562
Assumptions Used in Determining Fair Value of Stock Options and Warrants Granted [Abstract]
Volatility			71.80%	79.80%	77.96%	79.80%
Risk-free interest rate			1.19%	1.59%	1.38%	1.74%
Expected term			6 years 25 days	6 years 29 days	6 years 7 days	6 years 29 days
Dividend rate			0.00%	0.00%	0.00%	0.00%
Fair value of option on grant date (in dollars per share) \| $ / shares			$ 6.78	$ 7.51	$ 5.24	$ 5.22
W. Bradford Middlekauff [Member] \| Nonqualified Options [Member]
Stock Options [Abstract]
Options granted (in shares)		80,000
Vesting period					4 years
W. Bradford Middlekauff [Member] \| Nonqualified Options [Member] \| Vesting One Year Following Date of Hire [Member]
Stock Options [Abstract]
Vesting percentage					25.00%
W. Bradford Middlekauff [Member] \| Nonqualified Options [Member] \| Vesting in 36 Monthly Installments Thereafter [Member]
Stock Options [Abstract]
Vesting percentage					75.00%
Number of monthly installments for vesting \| Installment					36
Harry J. Sacks [Member] \| Nonqualified Options [Member]
Stock Options [Abstract]
Options granted (in shares)	85,000
Vesting period					4 years
Harry J. Sacks [Member] \| Nonqualified Options [Member] \| Vesting One Year Following Date of Hire [Member]
Stock Options [Abstract]
Vesting percentage					25.00%
Harry J. Sacks [Member] \| Nonqualified Options [Member] \| Vesting in 36 Monthly Installments Thereafter [Member]
Stock Options [Abstract]
Vesting percentage					75.00%
Number of monthly installments for vesting \| Installment					36
The Plans [Member] \| Stock Options [Member]
Stock Options [Abstract]
Options granted (in shares)					1,061,400
The Plans [Member] \| Incentive Stock Options [Member]
Stock Options [Abstract]
Vesting period					4 years
The Plans [Member] \| Incentive Stock Options [Member] \| Maximum [Member]
Stock Options [Abstract]
Term of option					10 years
The Plans [Member] \| Nonqualified Options [Member] \| Minimum [Member]
Stock Options [Abstract]
Vesting period					3 years
The Plans [Member] \| Nonqualified Options [Member] \| Maximum [Member]
Stock Options [Abstract]
Vesting period					4 years
2010 Equity Incentive Plan [Member]
Stock Options [Abstract]
Number of shares authorized for issuance (in shares)							1,350,412			1,279,146		548,206
Term of plan					10 years
2012 Equity Incentive Plan [Member]
Stock Options [Abstract]
Number of shares authorized for issuance (in shares)											1,096,411
Term of plan					10 years
2014 Equity Incentive Plan [Member]
Stock Options [Abstract]
Number of shares authorized for issuance (in shares)							1,827,351	3,047,323	1,894,890
Percentage of Common Stock outstanding used to determine annual increase in the plan limit							4.00%
Term of plan					10 years
Research and Development [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense \| $			$ 567,452	$ 273,782	$ 1,609,683	$ 702,322
General and Administrative [Member]
Stock-Based Compensation [Abstract]
Stock-based compensation expense \| $			$ 665,579	$ 338,096	$ 2,419,643	$ 864,240