Organization and Summary of Significant Accounting Policies - Narrative (Details)			12 Months Ended			59 Months Ended	67 Months Ended
	Feb. 12, 2019 USD ($) item tranche	May 24, 2018 tranche shares	Dec. 31, 2023 USD ($) item customer segment shares	Dec. 31, 2022 USD ($) customer shares	Dec. 31, 2021 USD ($) customer shares	Dec. 31, 2023 USD ($)	Dec. 31, 2023 USD ($)
Summary Of Significant Accounting Policy [Line Items]
Restricted cash balance			$ 2,100,000	$ 1,900,000		$ 2,100,000	$ 2,100,000
Restricted cash including prepaid expenses and other assets			$ 2,000,000.0			2,000,000.0	2,000,000.0
Number of primary revenue sources | item			2
Reserve for expected credit losses			$ 3,966,000	3,630,000	$ 3,349,000	3,966,000	3,966,000
Additional credit loss expense			1,084,000	700,000
Sales, general and administrative			496,874,000	401,575,000	515,007,000
Research and development costs			$ 303,719,000	233,810,000	$ 194,026,000
Number of depository institutions | item			2
Aggregate balances in depository institution accounts			$ 560,400,000			560,400,000	560,400,000
Cash surrender value of corporate-owned life insurance policies			7,558,000	$ 4,274,000		7,558,000	7,558,000
Denomination of notes used for determination of fair value			$ 1,000			1,000	1,000
Number of reportable segments of company | segment			2
Recorded share-based compensation expense							246,000,000.0
Number of options, granted (in shares) | shares			0	0	0
Credit loss			$ 0	$ 0
Impairment charges			$ 300,000	$ 5,300,000
Net Sales | Geographic Concentration Risk
Summary Of Significant Accounting Policy [Line Items]
Number of countries outside the U.S. representing more than 10% of total net sales			0	0	0
Net Sales | Customer Concentration Risk
Summary Of Significant Accounting Policy [Line Items]
Number of major customers | customer			0	0	0
Accounts and notes receivable and contract assets | Customer Concentration Risk
Summary Of Significant Accounting Policy [Line Items]
Number of major customers | customer			0	0
Advertising
Summary Of Significant Accounting Policy [Line Items]
Sales, general and administrative			$ 1,900,000	$ 2,300,000	$ 2,600,000
eXponential Stock Units
Summary Of Significant Accounting Policy [Line Items]
Unrecognized stock-based compensation expense			$ 0			0	0
Performance Shares
Summary Of Significant Accounting Policy [Line Items]
Number of options, granted (in shares) | shares		6,365,856
Chief Executive Officer
Summary Of Significant Accounting Policy [Line Items]
Number of award tranches | tranche		12
Number of operational goals | item			12
Chief Executive Officer | Performance Shares
Summary Of Significant Accounting Policy [Line Items]
Number of options vested | shares			6,400,000
Number of operational goals | item			12
Recorded share-based compensation expense			$ 246,000,000.0
Unrecognized stock-based compensation expense			$ 0			0	0
2019 eXponential Stock Performance Plan | eXponential Stock Units
Summary Of Significant Accounting Policy [Line Items]
Restricted stock, expiration period	9 years
Number of award tranches | tranche	12
Market capitalization goal	$ 2,500,000,000
Market capitalization goal increment	$ 1,000,000,000.0
Number of performance goals, revenue | item	8
Number of operational goals | item			12
Recorded share-based compensation expense			$ 199,900,000			199,900,000
Unrecognized stock-based compensation expense			$ 0			$ 0	$ 0
Post-vest holding period			2 years 6 months
Expected dividend yield (as percentage)			0.00%			0.00%	0.00%
Minimum | 2019 eXponential Stock Performance Plan | eXponential Stock Units
Summary Of Significant Accounting Policy [Line Items]
Liquidity discount (as percentage)			10.30%			10.30%	10.30%
Risk-free interest rate (as percentage)			0.50%
Expected life of options			5 years 2 months 12 days
Expected volatility (as percentage)			46.40%
Maximum | 2019 eXponential Stock Performance Plan | eXponential Stock Units
Summary Of Significant Accounting Policy [Line Items]
Liquidity discount (as percentage)			17.60%			17.60%	17.60%
Risk-free interest rate (as percentage)			4.10%
Expected life of options			8 years
Expected volatility (as percentage)			55.80%
2027 Notes
Summary Of Significant Accounting Policy [Line Items]
Denomination of notes used for determination of fair value			$ 1,000	$ 1,000		$ 1,000	$ 1,000
Interest rate (as a percent)			0.50%	0.50%		0.50%	0.50%
Seattle office
Summary Of Significant Accounting Policy [Line Items]
Impairment of long-lived assets to be disposed				$ 3,300,000
Scottsdale, Arizona campus
Summary Of Significant Accounting Policy [Line Items]
Impairment of ongoing project				$ 1,400,000