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COMMITMENTS AND CONTINGENCIES (Details)	6 Months Ended
	Jun. 30, 2021 USD ($)
COMMITMENTS AND CONTINGENCIES
Loss Contingency, Damages Sought, Value	$ 1,600,000
Loss Contingency, Damages Sought, Number of Transactions	2
Broker claim for interest	$ 335,000
Broker Claim for attorney's fees	$ 600,000

X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter relating to attorney fees.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrkr_
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Balance Type:	debit
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X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter with respect to interest.

+ References

No definition available.

+ Details

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

X

- Definition

The number of transactions of the award the plaintiff seeks in the legal matter.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrkr_
Data Type:	xbrli:integerItemType
Balance Type:	na
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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14557-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14435-108349

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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