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STOCKHOLDERS' EQUITY - Share Purchase Warrants (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2020
STOCKHOLDERS' EQUITY |  |
Number of Warrants, Beginning balance | 20,830,000 |
Number of Warrants, Ending balance | 20,830,000 | 20,830,000
Weighted Average Exercise Price, Beginning Balance | $ 4.47 |
Weighted Average Exercise Price, Ending Balance | $ 4.47 | $ 4.47
Weighted Average Remaining Contractual Life (in years) | 2 years 1 month 9 days | 2 years 7 months 6 days
Total Intrinsic Value | $ 0 | $ 0

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- Definition Intrinsic value of outstanding class of warrant or right. + References No definition available. + Details
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Namespace Prefix: | mrkr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Class Of Warrant Or Rights Outstanding Weighted Average Exercise Price. + References No definition available. + Details
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Namespace Prefix: | mrkr_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Class of warrant or right outstanding issued weighted average remaining life. + References No definition available. + Details
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Period Type: | duration

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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
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