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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (Parentheticals) - USD ($)	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Statement Of Financial Position [Abstract]
Proceeds from the sale of common stock and warrants net	$ 854,078
Common stock issuance costs	$ 0	$ 9,301

X

- Definition

Represents the proceeds from issuance of common stock and warrants.

+ References

No definition available.

+ Details

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Namespace Prefix:	embi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash outflow for cost incurred directly with the issuance of an equity security.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

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

X

- References

No definition available.

+ Details

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