CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Statement of Stockholders' Equity [Abstract]
Issuance costs under reverse asset acquisition	$ 2.6

The amount of costs related to issuance of stock under reverse asset acquisition.

No definition available.

Name:	ocgn_CostsRelatedToIssuanceOfStockUnderReverseAssetAcquisition
Namespace Prefix:	ocgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration