XML 46 R33.htm IDEA: XBRL DOCUMENT
v3.20.2

NET LOSS PER SHARE - Potentially Dilutive Securities (Details) - shares | 6 Months Ended
--- | ---
Jun. 30, 2020 | Jun. 30, 2019
Potentially dilutive securities | 27,223,000 | 27,574,000
Common stock options |  |
Common stock purchase warrants | 5,842,000 | 4,568,000
Common stock purchase warrants |  |
Common stock purchase warrants | 21,381,000 | 22,979,000
Common stock warrants - liability treatment |  |
Common stock purchase warrants | 0 | 27,000

X
- Definition Common stock warrants - equity treatment. + References No definition available. + Details
Name: | mrkr_CommonStockWarrantsEquityTreatment
Namespace Prefix: | mrkr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=us-gaap_WarrantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis=mrkr_CommonStockWarrantsLiabilityTreatmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |