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Earnout Interests Liability - Fair Value Measurement Inputs and Valuation Techniques (Details) $ in Thousands	Dec. 31, 2020 USD ($) Y $ / shares
Earnout Interests Liability [Line items]
Earnout interests liability, fair value | $	$ 351,048
Fair Value, Inputs, Level 3 | Volatility
Earnout Interests Liability [Line items]
Measurement input	0.546
Fair Value, Inputs, Level 3 | Term (years)
Earnout Interests Liability [Line items]
Measurement input | Y	2.99
Fair Value, Inputs, Level 3 | Risk-free interest rate
Earnout Interests Liability [Line items]
Measurement input	0.0017
Fair Value, Inputs, Level 3 | Stock price (in usd per share) | Minimum
Earnout Interests Liability [Line items]
Measurement input	21.51
Fair Value, Inputs, Level 3 | Stock price (in usd per share) | Maximum
Earnout Interests Liability [Line items]
Measurement input	21.65

X

- Definition

Fair value as of the balance sheet date of the earn-out interests liability.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Line items about earnout interests liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	rsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Value of input used to measure earn-out interests liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	rsi_
Data Type:	xbrli:decimalItemType
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Period Type:	instant

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- Details

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