Aggregate Conversion Of Debt, Related to Financing Target

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- Definition

Amortization Payments, Rate

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- Definition

Benchmark for other Waterfall Loans

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- Definition

Conversion Of Debt, Related to Financing Target

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No definition available.

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- Definition

Conversion Rate, Per Proceed Unit

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- Definition

Convertible Debt, VWAP Days

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- Definition

Debt Covenant, Minimum Global Liquidity Requirement

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- Definition

Debt Covenant, Revenue

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- Definition

Debt Due Rate

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- Definition

Debt Instrument, Commitment Reduction

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- Definition

Debt Instrument, Mandatory Conversion

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- Definition

Debt Instrument, Voluntary Conversion Amount

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- Definition

Debt Restructuring Fee, Common Shares Issued

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Debt Restructuring Fee, Preferred Shares Issued

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Debt Restructuring Fee, Value of Shares Issued

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- Definition

Derivative Liabilities Removal

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- Definition

Forced Conversion Amount, Maximum

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Interest Rate, Payable in Kind

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- Definition

Maximum Equity Owned by Investor

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- Definition

Percentage of Loans Extended Due Date

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- Definition

Target Liquidity, Financing Proceeds

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- Definition

Target Liquidity For Extended Term of Loan Repayment

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- Definition

Target Liquidity, Net Sales

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- Definition

Volume Weighted Average Price Rate

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- Definition

Waterfall Loans Due

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- Definition

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

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The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The price per share of the conversion feature embedded in the debt instrument.

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Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

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Face (par) amount of debt instrument at time of issuance.

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Amount of the fee that accompanies borrowing money under the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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Amount of issuance costs recognized in a share-lending arrangement entered into by the entity, in contemplation of a convertible debt offering or other financing, before deduction of accumulated amortization or effects of subsequent adjustments.

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Amount of expense (income) related to adjustment to fair value of warrant liability.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount of increase (decrease) of the credit facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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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.

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Cash received on stock transaction after deduction of issuance costs.

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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

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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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Name:	elgx_DebtInstrumentConvertibleConvertibleConditionsAxis=elgx_NellixApprovalExchangeConditionMember
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Period Type:

- Details

Name:	elgx_DebtInstrumentConvertibleConvertibleConditionsAxis=elgx_NellixApprovalExchangeMember
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Credit Facilities (Deerfield Facility Agreement, as Amended) (Details)						3 Months Ended		12 Months Ended
	Feb. 24, 2020 USD ($) $ / shares shares	Apr. 03, 2019 USD ($) $ / shares shares	Apr. 01, 2019 USD ($) day $ / shares shares	Mar. 31, 2019 USD ($)	Aug. 09, 2018 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Jul. 01, 2021	May 05, 2020	Mar. 04, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Apr. 03, 2017 USD ($)	Nov. 02, 2015 USD ($)
Debt Instrument [Line Items]
Stock trigger price (usd per share) \| $ / shares		$ 6.61
Number of shares issued \| shares		7,889,552
Sale of stock price per share (usd per share) \| $ / shares		$ 6.61
Consideration received on transaction		$ 52,150,000.00
Volume weighted average price rate trigger											85.00%
Maximum equity owned by Investor						9.50%
Loss on debt extinguishment						$ 730,000	$ 0
Long-term debt						182,661,000						$ 182,666,000
Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument face amount					$ 40,500,000.0
Debt instrument, stated interest rate					3.25%
Fourth Facility Amendment
Debt Instrument [Line Items]
Debt instrument face amount			$ 40,000,000.0
Term loan facility \| Facility Agreement, Due 2023
Debt Instrument [Line Items]
Debt instrument face amount													$ 120,000,000.0
Amortization payments, rate													33.33%
Term loan facility \| Term Loan
Debt Instrument [Line Items]
Deferred financing cost						2,400,000.0
First Out Waterfall Notes
Debt Instrument [Line Items]
Fair value of warrants issued in connection with the Facility Agreement						500,000.0
Derivative liabilities removal						$ 1,400,000
Convertible notes \| Convertible Senior Notes Due 2020
Debt Instrument [Line Items]
Debt instrument face amount														$ 125,000,000
Debt instrument, stated interest rate														3.25%
Convertible notes \| Fourth Facility Amendment
Debt Instrument [Line Items]
Conversion price (USD per share) \| $ / shares	$ 2.00
Convertible notes \| Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Debt instrument, stated interest rate						5.00%
Interest rate, payable in kind						4.75%
Revolving loan facility
Debt Instrument [Line Items]
Debt instrument, stated interest rate				5.50%			5.50%
Loss on debt extinguishment						$ 3,400,000
Deferred financing cost						$ 400,000.0
Revolving loan facility \| Amended and Restated Facility Agreement
Debt Instrument [Line Items]
Debt instrument face amount					$ 40,500,000.0
Amortization payments, rate					50.00%
Amended First Out Waterfall Notes
Debt Instrument [Line Items]
Target liquidity, financing proceeds	$ 5,000,000
Conversion of debt \| $ / shares											$ 0.50
Conversion rate											$ 1
Aggregate conversion of debt											$ 20,000,000
Value of shares issued	$ 2,000,000.0
Common shares issued (in shares) \| shares	950,000
Preferred shares issued (in shares) \| shares	14,648.75
Amended First Out Waterfall Notes \| Discretionary Conversion
Debt Instrument [Line Items]
Volume weighted average price rate trigger											85.00%
Debt Instrument, Voluntary Conversion Amount											$ 60,000,000.0
Deerfield ELGX Revolver, LLC
Debt Instrument [Line Items]
Stock trigger price (usd per share) \| $ / shares			$ 6.625
Mandatory conversion of shares			$ 1,666,666
Line of credit facility increase (decrease)					$ 5,000,000
Exit fee upon termination			6,100,000.0		11,100,000.0
Commitment reduction			$ 10,000,000
Maximum equity owned by Investor						4.985%
Deerfield ELGX Revolver, LLC \| Fixed Price Conversion
Debt Instrument [Line Items]
VWAP days \| day			5
Deerfield ELGX Revolver, LLC \| Term loan facility \| Second Amendment to Facility Agreement
Debt Instrument [Line Items]
Maximum number of shares under mandatory redemption \| shares			1,430,001
Deerfield ELGX Revolver, LLC \| Revolving loan facility
Debt Instrument [Line Items]
Debt instrument face amount				$ 120,000,000.0			$ 120,000,000.0
Global liquidity requirement				$ 17,500,000.0	$ 22,500,000.0
Waterfall loans due				16.67%			16.67%					33.33%
Remainder of the first out water fall loans				50.00%			50.00%
Deerfield ELGX Revolver, LLC \| Revolving loan facility \| First Out Waterfall Notes \| Fourth Facility Amendment
Debt Instrument [Line Items]
Debt covenant, revenue	$ 142,500,000
Minimum \| Term loan facility \| Term Loan
Debt Instrument [Line Items]
Interest expense						$ 5,300,000.0
Maximum \| Term loan facility \| Term Loan
Debt Instrument [Line Items]
Interest expense						$ 34,700,000.0
Maximum \| Deerfield ELGX Revolver, LLC
Debt Instrument [Line Items]
Mandatory conversion of shares			$ 25,000,000.0
Subsequent Event
Debt Instrument [Line Items]
Debt instrument, stated interest rate										1.00%
Subsequent Event \| Deerfield ELGX Revolver, LLC \| Revolving loan facility \| First Out Waterfall Notes \| Fourth Facility Amendment
Debt Instrument [Line Items]
Percentage of debt due									16.67%
Series DF-1 Preferred Stock \| Revolving loan facility
Debt Instrument [Line Items]
Convertible preferred stock authorized (in shares) \| shares											5,000,000
Series DF-1 Preferred Stock \| Amended First Out Waterfall Notes
Debt Instrument [Line Items]
Volume weighted average price rate trigger											200.00%
Convertible preferred stock par value (in dollars per share) \| $ / shares											$ 0.001
Conversion ratio						100
Convertible preferred stock authorized (in shares) \| shares											1,150,000
Convertible Condition Three \| Amended First Out Waterfall Notes
Debt Instrument [Line Items]
Forced Conversion Amount, Maximum											$ 3,500,000.0
Initial Exchange Condition \| Revolving loan facility \| First Out Waterfall Notes
Debt Instrument [Line Items]
Conversion price (USD per share) \| $ / shares											$ 0.8282
Initial Exchange Condition \| Amended First Out Waterfall Notes
Debt Instrument [Line Items]
Exercise price (usd per share) \| $ / shares											$ 1.50
Initial Exchange Condition \| Deerfield ELGX Revolver, LLC \| Revolving loan facility \| First Out Waterfall Notes
Debt Instrument [Line Items]
Percentage of loans for extended due date											8.333%
Initial Exchange Condition \| Subsequent Event \| Revolving loan facility
Debt Instrument [Line Items]
Target liquidity for extended term of loan repayment								$ 1,000,000.0
Nellix Submission Exchange \| Amended First Out Waterfall Notes
Debt Instrument [Line Items]
Volume weighted average price rate trigger											85.00%
Debt conversion, converted instrument, amount	2,500,000
Nellix Approval Exchange Condition \| Amended First Out Waterfall Notes
Debt Instrument [Line Items]
Debt conversion, converted instrument, amount	7,500,000
Nellix Approval Exchange \| Amended First Out Waterfall Notes
Debt Instrument [Line Items]
Target liquidity, net sales	$ 10,000,000