XML 40 R29.htm IDEA: XBRL DOCUMENT
v3.21.2

Redeemable Convertible Preferred Stock Warrants (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2021
2019 Warrants |
Class Of Warrant Or Right [Line Items] |
Schedule of Fair Value of Warrants Calculated Using Black-Scholes Model | The fair value of the 2019 Warrants as of December 31, 2020 was calculated using the Black-Scholes option-pricing model with the following assumptions:
|  | December 31,
|  | 2020
Expected term (in years) |  | 8.1 – 8.5
Expected volatility |  | 42.18% – 42.63%
Risk-free interest rate |  | 2.33% – 2.49%
Dividend yield |  | –
2020 Warrants |
Class Of Warrant Or Right [Line Items] |
Schedule of Fair Value of Warrants Calculated Using Black-Scholes Model | The fair value of the redeemable convertible preferred stock warrants was determined using the following assumption as of each report date:
|  | June 30, |  | December 31,
|  | 2021 |  | 2020
Term (in years) |  | 0.04 – 2.04 |  | 0.58 – 2.58
Expected volatility |  | 37.9% - 59.5% |  | 55.9% - 65.6%
Risk-free interest rate |  | 0.05% - 0.26% |  | 0.08% - 0.18%

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
Name: | us-gaap_ScheduleOfStockholdersEquityNoteWarrantsOrRightsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=sght_TwoThousandNineteenWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=sght_TwoThousandTwentyWarrantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |