XML 19 R6.htm IDEA: XBRL DOCUMENT
v3.21.2

Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2021 | Mar. 31, 2020
IPO |  |
Issuance costs | $ 23.8 |
Series E Convertible Preferred Stock |  |
Issuance costs |  | $ 94.0

X
- Definition Temporary equity, issuance costs. + References No definition available. + Details
Name: | sght_TemporaryEquityIssuanceCosts
Namespace Prefix: | sght_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=sght_SeriesEConvertiblePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |