CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) $ in Thousands	3 Months Ended
Jun. 30, 2020 USD ($)
CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
Convertible debt transaction costs	$ 3,267
Convertible debt taxes	$ 12,891

Represents the amount of convertible debt transaction costs.

No definition available.

Name:	gkos_ConvertibleDebtTransactionCostsAmount
Namespace Prefix:	gkos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration