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v3.21.1

Convertible Notes - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 30, 2020 | Aug. 31, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Jan. 01, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  | $ (8,083,393,000) |  |  | $ (7,891,542,000)
Additional paid-in capital |  |  | 9,777,646,000 |  |  | 10,200,141,000
Convertible senior notes, net |  |  | 2,245,203,000 |  |  | $ 1,675,169,000
Amortization of debt discount and issuance costs |  |  | $ 1,044,000 | $ 11,563,000 |  |
Accounting Standards Update 2020-06 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Change in accounting principle, accounting standards update, adoption date |  |  | Jan. 01, 2021 |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  |  | true |  |  |
Change in accounting principle, accounting standards update, early adoption [true false] |  |  | true |  |  |
Change in accounting principle, accounting standards update, transition option elected |  |  | snap:AccountingStandardsUpdate202006RetrospectiveMember |  |  |
Accounting Standards Update 2020-06 | Revision of Prior Period, Accounting Standards Update, Adjustment |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  |  |  | $ (95,000,000.0) |
Additional paid-in capital |  |  |  |  | (664,000,000.0) |
Convertible senior notes, net |  |  |  |  | $ 569,000,000.0 |
2025 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, principal amount | $ 1,000,000,000.0 |  | $ 1,000,000,000 |  |  |
Indenture date | Apr. 28, 2020 |  |  |  |  |
Proceeds from issuance of convertible notes, net of issuance costs | $ 888,600,000 |  |  |  |  |
Interest payment beginning date | Nov. 01, 2020 |  |  |  |  |
Debt instrument, interest rate | 0.25% |  |  |  |  |
Debt instrument, interest rate terms |  |  | Interest is payable in cash semi-annually in arrears beginning on November 1, 2020 at a rate of 0.25% per year. |  |  |
Debt instrument, maturity date | May 01, 2025 |  |  |  |  |
Debt instrument convertible, amortization period |  |  | 4 years 1 month 6 days |  |  |
If-converted value exceeding principal amount |  |  | $ 1,400,000,000 |  |  |
Cap price, net cost |  |  | $ 100,000,000.0 |  |  |
2025 Notes | Class A Non-voting Common Stock |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Shares issued upon conversion of each $1000 principal amount | 46.1233 |  |  |  |  |
Debt instrument, convertible principal amount used in conversion rate | $ 1,000 |  |  |  |  |
Conversion price per share | $ 21.68 |  |  |  |  |
Cap price, per share |  |  | $ 32.12 |  |  |
2026 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, principal amount |  | $ 1,265,000,000 | $ 1,265,000,000 |  |  |
Proceeds from issuance of convertible notes, net of issuance costs |  | $ 1,150,000,000 |  |  |  |
Interest payment beginning date |  | Feb. 01, 2020 |  |  |  |
Debt instrument, interest rate |  | 0.75% |  |  |  |
Debt instrument, interest rate terms |  |  | Interest is payable in cash semi-annually in arrears beginning on February 1, 2020 at a rate of 0.75% per year. |  |  |
Debt instrument, maturity date |  | Aug. 01, 2026 |  |  |  |
Debt instrument convertible, amortization period |  |  | 5 years 3 months 18 days |  |  |
Amortization of debt discount and issuance costs |  |  |  | 11,600,000 |  |
Amortization of debt issuance costs |  |  | $ 1,000,000.0 |  |  |
Contractual interest expense |  |  | 3,000,000.0 | $ 2,400,000 |  |
If-converted value exceeding principal amount |  |  | 1,600,000,000 |  |  |
Cap price, net cost |  |  | $ 102,100,000 |  |  |
2026 Notes | Class A Non-voting Common Stock |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Shares issued upon conversion of each $1000 principal amount |  | 43.8481 |  |  |  |
Debt instrument, convertible principal amount used in conversion rate |  | $ 1,000 |  |  |  |
Conversion price per share |  | $ 22.81 |  |  |  |
Cap price, per share |  |  | $ 32.58 |  |  |
Initial Placement | 2025 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, principal amount | $ 850,000,000.0 |  |  |  |  |
Over-Allotment Option | 2025 Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, principal amount | $ 150,000,000.0 |  |  |  |  |

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