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Condensed Statements of Redeemable Convertible Preferred Stock and Stockholders' Deficit (Unaudited) (Parenthetical) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Series E Convertible Preferred Stock
Issuance costs	$ 94

X

- Definition

Temporary equity, issuance costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	sght_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: