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Stock Based Compensation - Executive grants (Details) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Jun. 08, 2020 USD ($) $ / shares shares | May 15, 2020 USD ($) $ / shares shares | May 14, 2020 USD ($) | Apr. 15, 2020 USD ($) $ / shares shares | Apr. 30, 2019 Option | Apr. 29, 2019 Option $ / shares | Aug. 31, 2020 USD ($) shares | Dec. 31, 2020 USD ($) item shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Reverse Recapitalization Exchange Rate |  |  |  |  |  |  |  | 0.7471 |  |
Chief executive officer options to purchase shares | shares |  |  |  |  |  |  |  | 15,000,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Quarterly |  |  |  |  |  |  |  | 5.00% |  |
Share Based Compensation Related Shares Founder Grants |  |  |  |  |  |  |  | $ 47,841,859 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  | 47,841,859 |  |
Share Based Compensation Related Shares Founder Grants |  |  |  |  |  |  |  | $ 47,841,859 |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  | 23,757,000 | $ 1,237,000 | $ 6,680,000
Compensation expense recognized |  |  |  |  |  |  |  | $ 23,757,000 | $ 1,237,000 | $ 6,680,000
Issuance of common stock upon early exercise of stock options with promissory note (in shares) | shares |  |  |  |  |  |  |  | 15,000,000 |  |
Board of Directors Chairman [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Quarterly |  |  |  |  |  |  | 6.25% |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  | $ 2,300,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  | 2,757,886 |  |  |
Compensation expense |  |  |  |  |  |  | $ 23,500,000 |  |  |
Vesting percentage |  |  |  |  |  |  | 25.00% |  |  |
Founders Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employee Benefits and Share-based Compensation |  |  |  |  |  |  |  | 800,000 |  |
Grant date fair value of option recognized as compensation expense over the requisite service period |  |  |  |  |  |  |  | $ 93,400,000 |  |
Class A common stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Reverse Recapitalization Exchange Rate |  |  |  |  |  |  |  |  | 0.7471 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  | 24,669,278 |  |
Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Employee Benefits and Share-based Compensation |  |  |  |  |  |  |  |  | $ 11,000,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  | 8,172,581.0 | 700,000 |
Old Skillz Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  |  |  |  | 50 |  |
Vesting period |  |  |  |  |  |  |  | 50 |  |
Old Skillz Class A Common Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  |  |  | $ 1.15 |  |  |  |  |  |
Old Skillz Class B Common Stock [Member] | Chief Technology Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 50 |  |  |  |  |  |  |  |  |
Vesting period | 50 |  |  |  |  |  |  |  |  |
New Skillz Class B Common Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  | 9,960,000 |  |
New Skillz Class A common stock [Member] | Chief Revenue Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  | 2,040,000 |  |
General and administrative |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | $ 2,300,000 |
Compensation expense recognized |  |  |  |  |  |  |  |  | 2,300,000 |
Sales and marketing |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | 700,000 |
Compensation expense recognized |  |  |  |  |  |  |  |  | 700,000 |
Research and development |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  |  | 400,000 |
Compensation expense recognized |  |  |  |  |  |  |  |  | $ 400,000 |
Executive grants |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of separate options to purchase shares of Class A common stock | Option |  |  |  |  | 2 | 2 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Quarterly |  |  |  |  |  |  |  | 25.00% |  |
Executive grants | Promissory note |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  | 0.58% |  |  |  |  |  |  |
Outstanding principal of promissory note |  |  | $ 11,400,000 |  |  |  |  | $ 3,800,000 |  |
Interest rate |  |  |  |  |  |  |  | 2.55% |  |
Maximum term of promissory note |  |  |  |  |  |  |  | 9 years |  |
Executive grants | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  |  |  |  |  |  |  | $ 21,500,000 |  |
Employee Benefits and Share-based Compensation |  |  | $ 3,800,000 |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 100.00% |  |
Executive grants | Class A common stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Exercise price of options | $ / shares |  |  |  |  |  | $ 0.43 |  |  |  |
Executive grants | Class A common stock | Promissory note |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock upon early exercise of stock options with promissory note (in shares) | shares |  |  |  |  |  |  |  | 8,970,517 |  |
Executive grants | Class B Common Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  | $ 1.15 |  |  |  |  |  |  |  |
Executive grants | Old Skillz Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 4 years |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Quarterly |  |  |  |  |  |  |  | 6.25% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  |  |  |  | 100 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  |  |  |  |  | 9,921,314 |  |
Vesting period |  |  |  |  |  |  |  | 100 |  |
Vesting percentage |  |  |  |  |  |  |  | 25.00% |  |
Executive grants | Old Skillz Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  | 50 |  |  |  |  |  |  |  |
Vesting period |  | 50 |  |  |  |  |  |  |  |
First option | Old Skillz Class B Common Stock [Member] | Chief Technology Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 4 years |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Quarterly | 6.25% |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights | 100 |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 9,000,000 |  |  |  |  |  |  |  |  |
Employee Benefits and Share-based Compensation |  |  |  |  |  |  |  | $ 900,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares | 1,520,736 |  |  |  |  |  |  |  |  |
Vesting period | 100 |  |  |  |  |  |  |  |  |
Vesting percentage | 25.00% |  |  |  |  |  |  | 100.00% |  |
First option | Executive grants |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  |  |  |  |  |  |  | $ 700,000 |  |
Grant date fair value of option recognized as compensation expense over the requisite service period |  |  |  |  |  |  |  | 1,700,000 |  |
Compensation expense recognized |  |  |  |  |  |  |  | $ 700,000 |  |
First option | Executive grants | Chief Revenue Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Quarterly |  |  |  |  |  |  |  | 100.00% |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount |  | $ 3,500,000 |  |  |  |  |  |  |  |
Employee Benefits and Share-based Compensation |  |  |  |  |  |  |  | $ 600,000 |  |
First option | Executive grants | Class A common stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Chief executive officer options to purchase shares | shares |  |  |  |  |  |  |  | 2,990,172 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  |  |  |  |  |  |  | P4Y |  |
Vesting period |  |  |  |  |  |  |  | P4Y |  |
Vesting percentage |  |  |  |  |  |  |  | 0.021% |  |
First option | Executive grants | Class A common stock | Vesting of then-outstanding shares upon the consummation of an IPO |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 50.00% |  |
First option | Executive grants | Class A common stock | Vesting of then-outstanding shares upon the earlier of Exit Transaction or termination of service |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  | 100.00% |  |
First option | Executive grants | Old Skillz Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  | 4 years |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage, Quarterly |  | 6.25% |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights |  | 100 |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  | 1,852,695 |  |  |  |  |  |  |  |
Vesting period |  | 100 |  |  |  |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |  |  |  |  |  |
Second option | Old Skillz Class B Common Stock [Member] | Chief Technology Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares | $ 1.33 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares | 919,862 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 3,700,000 |  |  |  |  |  |  |  |  |
Second option | Old Skillz Class B Common Stock [Member] | Minimum | Chief Technology Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | 1,800,000,000 |  |  |  |  |  |  |  |  |
Second option | Old Skillz Class B Common Stock [Member] | Maximum | Chief Technology Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ 3,000,000,000 |  |  |  |  |  |  |  |  |
Second option | Executive grants | Chief Revenue Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  |  | $ 2,000,000 |  |  |  |  |  |
Second option | Executive grants | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Market condition targets |  |  |  |  |  |  |  | $ 600,000,000 |  |
Second option | Executive grants | Class A common stock |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Chief executive officer options to purchase shares | shares |  |  |  |  |  |  |  | 5,980,344 |  |
Number of market condition targets related to the valuation of the Company | item |  |  |  |  |  |  |  | 8 |  |
Grant date fair value of option recognized as compensation expense over the requisite service period |  |  |  |  |  |  |  | $ 900,000 |  |
Second option | Executive grants | Class A common stock | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Market condition targets |  |  |  |  |  |  |  | $ 2,700,000,000 |  |
Second option | Executive grants | Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate During Period |  |  | 0.58% |  |  |  |  |  |  |
Share Based Compensation Related Shares Founder Grants |  |  | $ 2,779,042 |  |  |  |  |  |  |
Share Based Compensation Related Shares Founder Grants |  |  | 2,779,042 |  |  |  |  |  |  |
Outstanding principal of promissory note |  |  | $ 3,200,000 |  |  |  |  |  |  |
Second option | Executive grants | Old Skillz Class B Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares |  |  |  | 926,347 |  |  |  |  |  |
Second option | Executive grants | Old Skillz Class B Common Stock [Member] | Minimum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  |  | $ 1,500,000,000 |  |  |  |  |  |
Second option | Executive grants | Old Skillz Class B Common Stock [Member] | Maximum |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  |  | $ 2,700,000,000 |  |  |  |  |  |

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