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Stockholders' Equity - Common Stock - Additional Information (Details)	6 Months Ended
	Jun. 30, 2019 Class
Equity [Abstract]
Number of classes	2

X

- Definition

Number of classes of common stock.

+ References

No definition available.

+ Details

Name:	roku_NumberOfClassesOfCommonStock
Namespace Prefix:	roku_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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