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Investments - Investments consists of available-for-sale securities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($)
Short Term Marketable Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 83,208
Unrealized Loss	9
Estimated Fair Value	83,199
Long Term Marketable Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	23,628
Unrealized Loss	9
Estimated Fair Value	23,619
US Government Debt Securities [Member] | Long Term Marketable Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,995
Estimated Fair Value	3,995
Corporate Bonds [Member] | Short Term Marketable Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	83,208
Unrealized Loss	9
Estimated Fair Value	83,199
Corporate Bonds [Member] | Long Term Marketable Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	19,633
Unrealized Loss	9
Estimated Fair Value	$ 19,624

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563

+ Details

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

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=elym_LongTermMarketableSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: