Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended
Mar. 31, 2019
Minimum [Member]
Summary of Significant Accounting Policy [Line Items]
Short term investments, maturity period	3 months

Available-for-sale securities investments maturity period.

No definition available.

Name:	ovid_AvailableForSaleSecuritiesInvestmentsMaturityPeriod
Namespace Prefix:	ovid_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration