Debt Obligations - Schedule of Cash Payments on Debt Obligations (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Maturities of Long-term Debt and Financing Obligations [Abstract]
2021	$ 740
2022	122
2023	528,403
Total future cash commitments	$ 529,265

Long-Term Debt and Financing Obligations, Maturity, Year Three

No definition available.

Name:	dxm_LongTermDebtAndFinancingObligationsMaturityYearThree
Namespace Prefix:	dxm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant