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CONVERTIBLE NOTES (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Convertible Notes Payables [Abstract] |  |
Convertible notes | $ 1,282,496 | $ 1,840,406
2023 Convertible Notes [Member] |  |
Convertible Notes Payables [Abstract] |  |
Convertible notes | 29,190 | 41,263
2024 Convertible Notes [Member] |  |
Convertible Notes Payables [Abstract] |  |
Convertible notes | 348,137 | 916,560
2025 Convertible Notes [Member] |  |
Convertible Notes Payables [Abstract] |  |
Convertible notes | $ 905,169 | $ 882,583

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- Definition Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_ConvertibleLongTermNotesPayable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_ConvertibleLongtermNotesPayableCurrentAndNoncurrentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=se_ConvertibleNotesPayable2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=se_ConvertibleNotesPayable2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=se_ConvertibleNotesPayable2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |