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Summary of Significant Accounting Policies - Additional Information (Details)	3 Months Ended
	Mar. 31, 2025
Summary of Significant Accounting Policies
ESPP, period for recognition of expense	6 months

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration