Business Combination - Narrative (Details) - USD ($)				1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 16, 2021	Dec. 16, 2020	Mar. 02, 2020	Mar. 31, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Business Acquisition [Line Items]
Recapitalization exchange ratio		74.71%
Cash consideration		$ 566,204,152
Number of shares issued in private placement (in shares)		15,853,052	69,000,000				10,033,333
Stock sold, price per share (in dollars per share)		$ 10.00	$ 10.00	$ 23.34		$ 23.34
Aggregate consideration		$ 158,500,000		$ 408,000,000
Shares authorized (in shares)		635,000,000			635,000,000		635,000,000
Common stock, par value (in dollars per share)		$ 0.0001			$ 0.0001		$ 0.0001		$ 0.0001
Preferred stock, par value (in dollars per share)		$ 0.0001			$ 0.0001		$ 0.0001		$ 0.0001
Common stock, shares authorized (in shares)					625,000,000		625,000,000		625,000,000
Preferred stock, shares authorized (in shares)		10,000,000			10,000,000		10,000,000		10,000,000
Revenue					$ 5,400,000		$ 5,400,000
Net loss					2,800,000		2,800,000
Issuance costs				$ 5,900,000		$ 6,800,000	13,221,000	$ 653,000
Aarki
Business Acquisition [Line Items]
Percentage of voting interest acquired	100.00%
Total purchase price	$ 162,347,000
Cash	95,296,000
Common stock issued	$ 67,051,000
Number of shares issued (in shares)	4,401,663
Transaction costs					6,000,000		7,000,000
Issuance costs					$ 100,000		$ 100,000
Class A common stock, par value $0.0001 per share
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)					339,000,000		339,000,000		292,000,000
Common stock, shares authorized (in shares)		500,000,000			500,000,000		500,000,000		500,000,000
Class B Common Stock
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)					69,000,000		69,000,000		78,000,000
Common stock, par value (in dollars per share)					$ 0.0001		$ 0.0001
Common stock, shares authorized (in shares)		125,000,000			125,000,000		125,000,000		125,000,000
Stock Election Shareholders
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)		359,518,849
Stock Election Shareholders | Class A common stock, par value $0.0001 per share
Business Acquisition [Line Items]
Merger consideration in shares (in shares)		191,932,860
Stock Election Shareholders | Class B Common Stock
Business Acquisition [Line Items]
Merger consideration in shares (in shares)		76,663,551
Cash Election Shareholders
Business Acquisition [Line Items]
Common stock, shares outstanding (in shares)		75,786,931
Sponsor | Class B Common Stock
Business Acquisition [Line Items]
Shares in escrow (in shares)		10,000,000
Sponsor Earnout Shares | Class A common stock, par value $0.0001 per share
Business Acquisition [Line Items]
Number of shares issued in private placement (in shares)		5,000,000
Skillz Earnout Shares | Class A common stock, par value $0.0001 per share
Business Acquisition [Line Items]
Number of shares issued in private placement (in shares)		5,000,000