Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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Balance Type:	na
Period Type:	duration

- Definition

Amount of interest expense incurred on a debt or other obligation to related party.

+ References

No definition available.

+ Details

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- Definition

The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

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Balance Type:	debit
Period Type:	duration

- Definition

The average effective interest rate during the reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	zest_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

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- Details

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Notes Payable - Related Parties (Details) - USD ($) $ in Thousands	1 Months Ended		9 Months Ended
	Aug. 31, 2019	May 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Notes Payable - Related Parties (Textual)
Advances			$ 403
Annual Interest rate, percentage			10.00%
Debt instrument, maturity date			Jul. 30, 2020
Interest on related party			$ 18
William B. Hoagland [Member]
Notes Payable - Related Parties (Textual)
Advances	$ 45	$ 30
Board Member [Member]
Notes Payable - Related Parties (Textual)
Advances			$ 328