FAIR VALUE MEASUREMENTS - Narrative (Details)	Jun. 30, 2020 future_event
Fair Value Disclosures [Abstract]
Estimated future equity financing events	0

Estimated Future Equity Financing Events, Next Twelve Months

No definition available.

Name:	mark_EstimatedFutureEquityFinancingEventsNextTwelveMonths
Namespace Prefix:	mark_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant