XML 47 R36.htm IDEA: XBRL DOCUMENT
v3.21.2

Accounts Payable and Accrued Expenses - Additional Information (Detail) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2021 USD ($)
Net decrease in accrued salaries and bonuses | $ 19.1

X
- Definition Increase (decrease) in accrued salaries and bonuses. + References No definition available. + Details
Name: | md_IncreaseDecreaseInAccruedSalariesAndBonuses
Namespace Prefix: | md_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration