Summary of Significant Accounting Policies - Additional Information (Details)	6 Months Ended
Jun. 30, 2025
Summary of Significant Accounting Policies
ESPP, period for recognition of expense	6 months

Period over which compensation expense is recognized prior to the purchase date.

No definition available.

Name:	ocul_ShareBasedCompensationArrangementByShareBasedPaymentAwardCompensationExpenseWithholdingPeriodPriorToPurchaseDate
Namespace Prefix:	ocul_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration